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[S10-EV] S10-EV Digest, Vol 127, Issue 19

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[S10-EV] S10-EV Digest, Vol 127, Issue 19

Gardner Harris Fri, 8 Nov 2013 17:16:05 -0800 2013 / #83
Re: Lithium Conversion I keep seeing Rich Hatfield's question on the no wakeup function of his Li
Pack ever since he installed a replacement battery blower. It the lack of a
response the result of no one having a verifiable answer or was there a
reply which I don't understand in my state of ignorance. If I end up
keeping my truck because either a) no one will give me what I think it's
worth after all I have invested in it or my Li-Ion battery in the Rev-EV
catches fire like the 3 in the last 3 weeks have done in the Tesla Ss and I
end up with no RAV4-EV at all. BTW the battery in my RAV4-EV purchased in January is already down about
10% from its charge levels when new. I used to get 101 miles out of a
regular charge and 132 miles out of an extended charge which I only used if
i knew I was making a trip of 100 miles or more and wouldn't be able to get
an opportunity charge. Now it's 89 miles and 112 miles respectfully for
normal/extended. This seems a bit abnormal but I will discuss this on the
RAV-EV group before I call Cabe Toyota to whine. Best to all, Gar Harris On Thu, Nov 7, 2013 at 10:13 AM, <[email removed]> wrote: > Send S10-EV mailing list submissions to
> [email removed]
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://five.pairlist.net/mailman/listinfo/s10-ev
> or, via email, send a message with subject or body 'help' to
> [email removed]
>
> You can reach the person managing the list at
> [email removed]
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of S10-EV digest..."
>
> Today's Topics:
>
> 1. Re: NiMH Self Discharge Rate (Richard Hatfield)
> 2. Re: NiMH Self Discharge Rate ([email removed])
> 3. Re: NiMH Self Discharge Rate (Gil Dawson)
>
>
> ---------- Forwarded message ----------
> From: Richard Hatfield <[email removed]>
> To: "[email removed]" <[email removed]>
> Cc: "[email removed]" <[email removed]>, Rayan Ghasel <
> [email removed]>, "[email removed]" <[email removed]>
> Date: Thu, 7 Nov 2013 07:27:21 -0800
> Subject: Re: [S10-EV] NiMH Self Discharge Rate
> Since the group is checking in I have a question. We have installed a
> lithium conversion in Rayan's S10-EV. All 26 banks are reading 13.32vdc to
> 13.34vdc and all temp sensors are reading ambient. We replaced the battery
> blower due to a bearing failure and board failure on the previous blower.
> The truck will not complete the wake up process and the blower will not
> run when turned on manually with the tech2. Suggestions of what to try
> next?
>
> Thanks,
>
> Richard Hatfield
> Lightning Motorcycle
>
>
> On Nov 6, 2013, at 7:54 PM, [email removed] wrote:
>
> Self discharge depends a lot on temperature
>
> If you fully charge a pack and it warms up to eighty plus degrees and
> don't drive it. You will lose capacity quickly. The tray retains heat for
> quite a long time. The NiMH modules also produce a little heat as they self
> discharge.
>
> The 12 volt battery will go dead or very near it in a couple of weeks.
>
> Even if you disconnect the High voltage plug. The BPCM continues to pull
> power out of the pack. I have had packs opened up off to the side of the
> vehicle and you can actually hear it.
>
> If the pack is cool say 50 degrees or less it will hold a charge for 4 to
> 6 weeks.
>
> However NiMH batteries don't do very well sitting around. Its really best
> to use them everyday 40% to 80% and fully charge them when your balancing
> or conditioning the pack. Which should be done once a month.
>
> Don Blazer
>
> In a message dated 11/6/2013 1:00:36 A.M. Pacific Standard Time,
> [email removed] writes:
>
> I have a '98 native NiMH. Over the years I have occasionally had to leave
> it sit for a few weeks or more without charging (vacation, down for
> maintenance, etc), and I also noticed the very high self-discharge rate.
> It seemed that it would loose most of its charge in about two weeks
> (modules in the low 13V range). (This is my observation, I don't have
> detailed measurements). I assumed it was internal self-discharge in the
> NiMH Modules.
>
> I recently discovered that if you disconnect the HV disconnect plug and
> disconnect the 12V auxiliary battery, the supposed self-discharge drops to
> a fraction of the rate observed when the truck is left in the key-off ready
> state. For example, after a full charge, and then disconnecting +12 and HV
> as mentioned, after 2-1/2 weeks the module voltages are still in the 14.2 V
> to 14.3V range. This makes me think that the self-discharge of the NiMH
> modules is really not that bad, and that there are other things on the
> truck (like all the computers and the periodic refreshing of the +12
> battery) that is the major source of the drain.
>
> Has anyone else tried this?
>
> If the others are like mine, then if you need to store the vehicle
> without charging for a few weeks (I don't know the limit on this), then be
> sure to disconnect the HV disconnect plug and the 12V aux battery.
>
> Thanks,
>
> Niel
> Chicago
>
> _______________________________________________
> S10-EV mailing list
> [email removed]
> http://five.pairlist.net/mailman/listinfo/s10-ev
>
>
>
> ---------- Forwarded message ----------
> From: [email removed]
> To: [email removed]
> Cc: [email removed], [email removed], [email removed]
> Date: Thu, 7 Nov 2013 13:02:07 -0500 (EST)
> Subject: Re: [S10-EV] NiMH Self Discharge Rate
> Hello Richard
>
> There are no DTC codes?
>
> If not then try disconnecting the accessory battery then the high voltage
> disconnect plug. Wait a few minutes then connect the high voltage
> disconnect plug then the accessory battery. It has to be done in this
> order. Sometimes you need to repeat this a couple of times.
>
> It does not correct all problems but its easy and the first thing you
> should try.
>
> Don Blazer
>
> In a message dated 11/7/2013 7:27:26 A.M. Pacific Standard Time,
> [email removed] writes:
>
> Since the group is checking in I have a question. We have installed a
> lithium conversion in Rayan's S10-EV. All 26 banks are reading 13.32vdc to
> 13.34vdc and all temp sensors are reading ambient. We replaced the battery
> blower due to a bearing failure and board failure on the previous blower.
> The truck will not complete the wake up process and the blower will not
> run when turned on manually with the tech2. Suggestions of what to try
> next?
>
> Thanks,
>
> Richard Hatfield
> Lightning Motorcycle
>
>
> On Nov 6, 2013, at 7:54 PM, [email removed] wrote:
>
> Self discharge depends a lot on temperature
>
> If you fully charge a pack and it warms up to eighty plus degrees and
> don't drive it. You will lose capacity quickly. The tray retains heat for
> quite a long time. The NiMH modules also produce a little heat as they self
> discharge.
>
> The 12 volt battery will go dead or very near it in a couple of weeks.
>
> Even if you disconnect the High voltage plug. The BPCM continues to pull
> power out of the pack. I have had packs opened up off to the side of the
> vehicle and you can actually hear it.
>
> If the pack is cool say 50 degrees or less it will hold a charge for 4 to
> 6 weeks.
>
> However NiMH batteries don't do very well sitting around. Its really best
> to use them everyday 40% to 80% and fully charge them when your balancing
> or conditioning the pack. Which should be done once a month.
>
> Don Blazer
>
> In a message dated 11/6/2013 1:00:36 A.M. Pacific Standard Time,
> [email removed] writes:
>
> I have a '98 native NiMH. Over the years I have occasionally had to leave
> it sit for a few weeks or more without charging (vacation, down for
> maintenance, etc), and I also noticed the very high self-discharge rate.
> It seemed that it would loose most of its charge in about two weeks
> (modules in the low 13V range). (This is my observation, I don't have
> detailed measurements). I assumed it was internal self-discharge in the
> NiMH Modules.
>
> I recently discovered that if you disconnect the HV disconnect plug and
> disconnect the 12V auxiliary battery, the supposed self-discharge drops to
> a fraction of the rate observed when the truck is left in the key-off ready
> state. For example, after a full charge, and then disconnecting +12 and HV
> as mentioned, after 2-1/2 weeks the module voltages are still in the 14.2 V
> to 14.3V range. This makes me think that the self-discharge of the NiMH
> modules is really not that bad, and that there are other things on the
> truck (like all the computers and the periodic refreshing of the +12
> battery) that is the major source of the drain.
>
> Has anyone else tried this?
>
> If the others are like mine, then if you need to store the vehicle
> without charging for a few weeks (I don't know the limit on this), then be
> sure to disconnect the HV disconnect plug and the 12V aux battery.
>
> Thanks,
>
> Niel
> Chicago
>
> _______________________________________________
> S10-EV mailing list
> [email removed]
> http://five.pairlist.net/mailman/listinfo/s10-ev
>
>
>
> ---------- Forwarded message ----------
> From: Gil Dawson <[email removed]>
> To: [email removed]
> Cc:
> Date: Thu, 7 Nov 2013 10:13:11 -0800
> Subject: Re: [S10-EV] NiMH Self Discharge Rate
> Hi, Richard--
>
> Check the power supply voltage (stick a pin through the wire) right at the
> blower. I think it's the red wire. The other two are ground and an on/off
> command voltage. It should read about 12 volts when the blower is
> commanded OFF and slightly lower when commanded ON.
>
> In my case, the voltage dropped to, like, 2 volts, which wouldn't turn the
> motor. We traced the wires (using the GM Electrical Wiring Diagrams in the
> Manual) to a connector up in that nest in front of the driver-side firewall
> and found a 10-volt drop across one particular pin on one particular
> connector. Bridging the connector made the blower run.
>
> Clearly, that pin is undersized for the amount of current carried for the
> blower. A similar connector/pin undersizement and eventual burnout is for
> the condenser fan, up near the radiator. It's easier to find, though,
> because the wires are more visible.
>
> --Gil
>
> On Nov 7, 2013, at 7:27 AM, Richard Hatfield wrote:
>
> Since the group is checking in I have a question. We have installed a
> lithium conversion in Rayan's S10-EV. All 26 banks are reading 13.32vdc to
> 13.34vdc and all temp sensors are reading ambient. We replaced the battery
> blower due to a bearing failure and board failure on the previous blower.
> The truck will not complete the wake up process and the blower will not
> run when turned on manually with the tech2. Suggestions of what to try
> next?
>
> Thanks,
>
> Richard Hatfield
> Lightning Motorcycle
>
>
> On Nov 6, 2013, at 7:54 PM, [email removed] wrote:
>
> Self discharge depends a lot on temperature
>
> If you fully charge a pack and it warms up to eighty plus degrees and
> don't drive it. You will lose capacity quickly. The tray retains heat for
> quite a long time. The NiMH modules also produce a little heat as they self
> discharge.
>
> The 12 volt battery will go dead or very near it in a couple of weeks.
>
> Even if you disconnect the High voltage plug. The BPCM continues to pull
> power out of the pack. I have had packs opened up off to the side of the
> vehicle and you can actually hear it.
>
> If the pack is cool say 50 degrees or less it will hold a charge for 4 to
> 6 weeks.
>
> However NiMH batteries don't do very well sitting around. Its really best
> to use them everyday 40% to 80% and fully charge them when your balancing
> or conditioning the pack. Which should be done once a month.
>
> Don Blazer
>
> In a message dated 11/6/2013 1:00:36 A.M. Pacific Standard Time,
> [email removed] writes:
>
> I have a '98 native NiMH. Over the years I have occasionally had to leave
> it sit for a few weeks or more without charging (vacation, down for
> maintenance, etc), and I also noticed the very high self-discharge rate.
> It seemed that it would loose most of its charge in about two weeks
> (modules in the low 13V range). (This is my observation, I don't have
> detailed measurements). I assumed it was internal self-discharge in the
> NiMH Modules.
>
> I recently discovered that if you disconnect the HV disconnect plug and
> disconnect the 12V auxiliary battery, the supposed self-discharge drops to
> a fraction of the rate observed when the truck is left in the key-off ready
> state. For example, after a full charge, and then disconnecting +12 and HV
> as mentioned, after 2-1/2 weeks the module voltages are still in the 14.2 V
> to 14.3V range. This makes me think that the self-discharge of the NiMH
> modules is really not that bad, and that there are other things on the
> truck (like all the computers and the periodic refreshing of the +12
> battery) that is the major source of the drain.
>
> Has anyone else tried this?
>
> If the others are like mine, then if you need to store the vehicle
> without charging for a few weeks (I don't know the limit on this), then be
> sure to disconnect the HV disconnect plug and the 12V aux battery.
>
> Thanks,
>
> Niel
> Chicago
>
> _______________________________________________
> S10-EV mailing list
> [email removed]
> http://five.pairlist.net/mailman/listinfo/s10-ev
>
> _______________________________________________
> S10-EV mailing list
> [email removed]
> http://five.pairlist.net/mailman/listinfo/s10-ev
>
>
>
> _______________________________________________
> S10-EV mailing list
> [email removed]
> http://five.pairlist.net/mailman/listinfo/s10-ev
>
> -- All mail checked by Norton Anti-Virus prior to transmission.
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[S10-EV] S10-EV Digest, Vol 127, Issue 19

Greg Brewsaugh Mon, 11 Nov 2013 07:57:27 -0800 2013 / #87
I suspect that your drop in range on the new RAV4-EV is due to lower
average temperatures lately in So CA. (I'm in Huntington Beach.) I was
somewhat alarmed to see the same thing in our 2011 Leaf and Volt as Winter
approached. Range came right back up in the late Spring the following
year. I guess 10% of a Lithium pack has a lizard heart and likes to
hibernate. Greg Brewsaugh
3EVs + PV in HB On Fri, Nov 8, 2013 at 5:16 PM, Gardner Harris <[email removed]> wrote: > Re: Lithium Conversion
>
> I keep seeing Rich Hatfield's question on the no wakeup function of his Li
> Pack ever since he installed a replacement battery blower. It the lack of a
> response the result of no one having a verifiable answer or was there a
> reply which I don't understand in my state of ignorance. If I end up
> keeping my truck because either a) no one will give me what I think it's
> worth after all I have invested in it or my Li-Ion battery in the Rev-EV
> catches fire like the 3 in the last 3 weeks have done in the Tesla Ss and I
> end up with no RAV4-EV at all.
>
> BTW the battery in my RAV4-EV purchased in January is already down about
> 10% from its charge levels when new. I used to get 101 miles out of a
> regular charge and 132 miles out of an extended charge which I only used if
> i knew I was making a trip of 100 miles or more and wouldn't be able to get
> an opportunity charge. Now it's 89 miles and 112 miles respectfully for
> normal/extended. This seems a bit abnormal but I will discuss this on the
> RAV-EV group before I call Cabe Toyota to whine.
>
> Best to all,
>
> Gar Harris
>
>
>
> On Thu, Nov 7, 2013 at 10:13 AM, <[email removed]> wrote:
>
>> Send S10-EV mailing list submissions to
>> [email removed]
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>> http://five.pairlist.net/mailman/listinfo/s10-ev
>> or, via email, send a message with subject or body 'help' to
>> [email removed]
>>
>> You can reach the person managing the list at
>> [email removed]
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of S10-EV digest..."
>>
>> Today's Topics:
>>
>> 1. Re: NiMH Self Discharge Rate (Richard Hatfield)
>> 2. Re: NiMH Self Discharge Rate ([email removed])
>> 3. Re: NiMH Self Discharge Rate (Gil Dawson)
>>
>>
>> ---------- Forwarded message ----------
>> From: Richard Hatfield <[email removed]>
>> To: "[email removed]" <[email removed]>
>> Cc: "[email removed]" <[email removed]>, Rayan Ghasel <
>> [email removed]>, "[email removed]" <[email removed]>
>> Date: Thu, 7 Nov 2013 07:27:21 -0800
>> Subject: Re: [S10-EV] NiMH Self Discharge Rate
>> Since the group is checking in I have a question. We have installed a
>> lithium conversion in Rayan's S10-EV. All 26 banks are reading 13.32vdc to
>> 13.34vdc and all temp sensors are reading ambient. We replaced the battery
>> blower due to a bearing failure and board failure on the previous blower.
>> The truck will not complete the wake up process and the blower will not
>> run when turned on manually with the tech2. Suggestions of what to try
>> next?
>>
>> Thanks,
>>
>> Richard Hatfield
>> Lightning Motorcycle
>>
>>
>> On Nov 6, 2013, at 7:54 PM, [email removed] wrote:
>>
>> Self discharge depends a lot on temperature
>>
>> If you fully charge a pack and it warms up to eighty plus degrees and
>> don't drive it. You will lose capacity quickly. The tray retains heat for
>> quite a long time. The NiMH modules also produce a little heat as they self
>> discharge.
>>
>> The 12 volt battery will go dead or very near it in a couple of weeks.
>>
>> Even if you disconnect the High voltage plug. The BPCM continues to pull
>> power out of the pack. I have had packs opened up off to the side of the
>> vehicle and you can actually hear it.
>>
>> If the pack is cool say 50 degrees or less it will hold a charge for 4 to
>> 6 weeks.
>>
>> However NiMH batteries don't do very well sitting around. Its really best
>> to use them everyday 40% to 80% and fully charge them when your balancing
>> or conditioning the pack. Which should be done once a month.
>>
>> Don Blazer
>>
>> In a message dated 11/6/2013 1:00:36 A.M. Pacific Standard Time,
>> [email removed] writes:
>>
>> I have a '98 native NiMH. Over the years I have occasionally had to
>> leave it sit for a few weeks or more without charging (vacation, down for
>> maintenance, etc), and I also noticed the very high self-discharge rate.
>> It seemed that it would loose most of its charge in about two weeks
>> (modules in the low 13V range). (This is my observation, I don't have
>> detailed measurements). I assumed it was internal self-discharge in the
>> NiMH Modules.
>>
>> I recently discovered that if you disconnect the HV disconnect plug and
>> disconnect the 12V auxiliary battery, the supposed self-discharge drops to
>> a fraction of the rate observed when the truck is left in the key-off ready
>> state. For example, after a full charge, and then disconnecting +12 and HV
>> as mentioned, after 2-1/2 weeks the module voltages are still in the 14.2 V
>> to 14.3V range. This makes me think that the self-discharge of the NiMH
>> modules is really not that bad, and that there are other things on the
>> truck (like all the computers and the periodic refreshing of the +12
>> battery) that is the major source of the drain.
>>
>> Has anyone else tried this?
>>
>> If the others are like mine, then if you need to store the vehicle
>> without charging for a few weeks (I don't know the limit on this), then be
>> sure to disconnect the HV disconnect plug and the 12V aux battery.
>>
>> Thanks,
>>
>> Niel
>> Chicago
>>
>> _______________________________________________
>> S10-EV mailing list
>> [email removed]
>> http://five.pairlist.net/mailman/listinfo/s10-ev
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: [email removed]
>> To: [email removed]
>> Cc: [email removed], [email removed], [email removed]
>> Date: Thu, 7 Nov 2013 13:02:07 -0500 (EST)
>> Subject: Re: [S10-EV] NiMH Self Discharge Rate
>> Hello Richard
>>
>> There are no DTC codes?
>>
>> If not then try disconnecting the accessory battery then the high voltage
>> disconnect plug. Wait a few minutes then connect the high voltage
>> disconnect plug then the accessory battery. It has to be done in this
>> order. Sometimes you need to repeat this a couple of times.
>>
>> It does not correct all problems but its easy and the first thing you
>> should try.
>>
>> Don Blazer
>>
>> In a message dated 11/7/2013 7:27:26 A.M. Pacific Standard Time,
>> [email removed] writes:
>>
>> Since the group is checking in I have a question. We have installed a
>> lithium conversion in Rayan's S10-EV. All 26 banks are reading 13.32vdc to
>> 13.34vdc and all temp sensors are reading ambient. We replaced the battery
>> blower due to a bearing failure and board failure on the previous blower.
>> The truck will not complete the wake up process and the blower will not
>> run when turned on manually with the tech2. Suggestions of what to try
>> next?
>>
>> Thanks,
>>
>> Richard Hatfield
>> Lightning Motorcycle
>>
>>
>> On Nov 6, 2013, at 7:54 PM, [email removed] wrote:
>>
>> Self discharge depends a lot on temperature
>>
>> If you fully charge a pack and it warms up to eighty plus degrees and
>> don't drive it. You will lose capacity quickly. The tray retains heat for
>> quite a long time. The NiMH modules also produce a little heat as they self
>> discharge.
>>
>> The 12 volt battery will go dead or very near it in a couple of weeks.
>>
>> Even if you disconnect the High voltage plug. The BPCM continues to pull
>> power out of the pack. I have had packs opened up off to the side of the
>> vehicle and you can actually hear it.
>>
>> If the pack is cool say 50 degrees or less it will hold a charge for 4 to
>> 6 weeks.
>>
>> However NiMH batteries don't do very well sitting around. Its really best
>> to use them everyday 40% to 80% and fully charge them when your balancing
>> or conditioning the pack. Which should be done once a month.
>>
>> Don Blazer
>>
>> In a message dated 11/6/2013 1:00:36 A.M. Pacific Standard Time,
>> [email removed] writes:
>>
>> I have a '98 native NiMH. Over the years I have occasionally had to
>> leave it sit for a few weeks or more without charging (vacation, down for
>> maintenance, etc), and I also noticed the very high self-discharge rate.
>> It seemed that it would loose most of its charge in about two weeks
>> (modules in the low 13V range). (This is my observation, I don't have
>> detailed measurements). I assumed it was internal self-discharge in the
>> NiMH Modules.
>>
>> I recently discovered that if you disconnect the HV disconnect plug and
>> disconnect the 12V auxiliary battery, the supposed self-discharge drops to
>> a fraction of the rate observed when the truck is left in the key-off ready
>> state. For example, after a full charge, and then disconnecting +12 and HV
>> as mentioned, after 2-1/2 weeks the module voltages are still in the 14.2 V
>> to 14.3V range. This makes me think that the self-discharge of the NiMH
>> modules is really not that bad, and that there are other things on the
>> truck (like all the computers and the periodic refreshing of the +12
>> battery) that is the major source of the drain.
>>
>> Has anyone else tried this?
>>
>> If the others are like mine, then if you need to store the vehicle
>> without charging for a few weeks (I don't know the limit on this), then be
>> sure to disconnect the HV disconnect plug and the 12V aux battery.
>>
>> Thanks,
>>
>> Niel
>> Chicago
>>
>> _______________________________________________
>> S10-EV mailing list
>> [email removed]
>> http://five.pairlist.net/mailman/listinfo/s10-ev
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: Gil Dawson <[email removed]>
>> To: [email removed]
>> Cc:
>> Date: Thu, 7 Nov 2013 10:13:11 -0800
>> Subject: Re: [S10-EV] NiMH Self Discharge Rate
>> Hi, Richard--
>>
>> Check the power supply voltage (stick a pin through the wire) right at
>> the blower. I think it's the red wire. The other two are ground and an
>> on/off command voltage. It should read about 12 volts when the blower is
>> commanded OFF and slightly lower when commanded ON.
>>
>> In my case, the voltage dropped to, like, 2 volts, which wouldn't turn
>> the motor. We traced the wires (using the GM Electrical Wiring Diagrams in
>> the Manual) to a connector up in that nest in front of the driver-side
>> firewall and found a 10-volt drop across one particular pin on one
>> particular connector. Bridging the connector made the blower run.
>>
>> Clearly, that pin is undersized for the amount of current carried for the
>> blower. A similar connector/pin undersizement and eventual burnout is for
>> the condenser fan, up near the radiator. It's easier to find, though,
>> because the wires are more visible.
>>
>> --Gil
>>
>> On Nov 7, 2013, at 7:27 AM, Richard Hatfield wrote:
>>
>> Since the group is checking in I have a question. We have installed a
>> lithium conversion in Rayan's S10-EV. All 26 banks are reading 13.32vdc to
>> 13.34vdc and all temp sensors are reading ambient. We replaced the battery
>> blower due to a bearing failure and board failure on the previous blower.
>> The truck will not complete the wake up process and the blower will not
>> run when turned on manually with the tech2. Suggestions of what to try
>> next?
>>
>> Thanks,
>>
>> Richard Hatfield
>> Lightning Motorcycle
>>
>>
>> On Nov 6, 2013, at 7:54 PM, [email removed] wrote:
>>
>> Self discharge depends a lot on temperature
>>
>> If you fully charge a pack and it warms up to eighty plus degrees and
>> don't drive it. You will lose capacity quickly. The tray retains heat for
>> quite a long time. The NiMH modules also produce a little heat as they self
>> discharge.
>>
>> The 12 volt battery will go dead or very near it in a couple of weeks.
>>
>> Even if you disconnect the High voltage plug. The BPCM continues to pull
>> power out of the pack. I have had packs opened up off to the side of the
>> vehicle and you can actually hear it.
>>
>> If the pack is cool say 50 degrees or less it will hold a charge for 4 to
>> 6 weeks.
>>
>> However NiMH batteries don't do very well sitting around. Its really best
>> to use them everyday 40% to 80% and fully charge them when your balancing
>> or conditioning the pack. Which should be done once a month.
>>
>> Don Blazer
>>
>> In a message dated 11/6/2013 1:00:36 A.M. Pacific Standard Time,
>> [email removed] writes:
>>
>> I have a '98 native NiMH. Over the years I have occasionally had to
>> leave it sit for a few weeks or more without charging (vacation, down for
>> maintenance, etc), and I also noticed the very high self-discharge rate.
>> It seemed that it would loose most of its charge in about two weeks
>> (modules in the low 13V range). (This is my observation, I don't have
>> detailed measurements). I assumed it was internal self-discharge in the
>> NiMH Modules.
>>
>> I recently discovered that if you disconnect the HV disconnect plug and
>> disconnect the 12V auxiliary battery, the supposed self-discharge drops to
>> a fraction of the rate observed when the truck is left in the key-off ready
>> state. For example, after a full charge, and then disconnecting +12 and HV
>> as mentioned, after 2-1/2 weeks the module voltages are still in the 14.2 V
>> to 14.3V range. This makes me think that the self-discharge of the NiMH
>> modules is really not that bad, and that there are other things on the
>> truck (like all the computers and the periodic refreshing of the +12
>> battery) that is the major source of the drain.
>>
>> Has anyone else tried this?
>>
>> If the others are like mine, then if you need to store the vehicle
>> without charging for a few weeks (I don't know the limit on this), then be
>> sure to disconnect the HV disconnect plug and the 12V aux battery.
>>
>> Thanks,
>>
>> Niel
>> Chicago
>>
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