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post #11 of 25 (permalink) Old 08-30-2013, 01:07 PM
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Where did you get this info? I have to disagree with leaving the battery at a low SOC.
Low SOC in a Prius is still above 40% charge. Therefore, it isn't that low. Everywhere I look, they recommend storing NiMH batteries at a partially discharged state. I know the Prius never fully charge the battery anyway to prolong the battery life. I think it's better to discharge it more especially when the car is sitting in the hot sun for the next 8 to 10 hours while I'm at work.

The ideal place to park is in the shade but if that is not available, at least discharge the battery as much as possible when there's heat. This is also true for Lithium batteries.
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post #12 of 25 (permalink) Old 08-30-2013, 03:57 PM
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Everywhere I look, they recommend storing NiMH batteries at a partially discharged state.
I'm curious, who is "they". I've never seen any legitimate documentation stating a reduced SOC is best for storing in a high heat environment.
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post #13 of 25 (permalink) Old 08-30-2013, 05:42 PM
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I'm curious, who is "they". I've never seen any legitimate documentation stating a reduced SOC is best for storing in a high heat environment.
"They" are the internet sites. The following drawback list for NiMH is from http://batteryuniversity.com/learn/a...ased_batteries


Limited service life; deep discharge reduces service life
Requires complex charge algorithm
Does not absorb overcharge well; trickle charge must be kept low
Generates heat during fast-charge and high-load discharge
High self-discharge; chemical additives reduce self-discharge at the expense of capacity
Performance degrades if stored at elevated temperatures; should be stored in a cool place at about 40 percent state-of-charge
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post #14 of 25 (permalink) Old 08-30-2013, 06:17 PM
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I still don't think reducing the SOC before parking in the sun is necessary. Upon startup, if the AC is working and the battery cooling fan is doing its job, the battery will operating within its designed parameters.

I cannot find any other info to support a Prius being driven to reduce the SOC before parking in the sun, neither on PriusChat or ToyotaNation.
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post #15 of 25 (permalink) Old 08-30-2013, 09:08 PM
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I still don't think reducing the SOC before parking in the sun is necessary. Upon startup, if the AC is working and the battery cooling fan is doing its job, the battery will operating within its designed parameters.

I cannot find any other info to support a Prius being driven to reduce the SOC before parking in the sun, neither on PriusChat or ToyotaNation.
If my car were sitting in the hot sun all day, A/C wouldn't be the first thing I turn on. The A/C would be discharging a hot battery. Instead, I would cool the cabin with the fan first and the fan uses the 12v. I would even drive a short distance with my windows down before I run the A/C
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post #16 of 25 (permalink) Old 08-30-2013, 09:32 PM
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post #17 of 25 (permalink) Old 08-30-2013, 09:38 PM
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Another site said http://www.thetruthaboutcars.com/201...-battery-life/

"
What are the factors that decrease battery life?
There are many factors involved, but put simply, having your battery at a very low state of charge or a very high state of charge has a negative impact on battery life. The rate at which you take the battery from charged to discharged or discharged to charged also has an impact. While cold temperatures may keep you from getting the most out of your battery, it usually doesn’t impact longevity. Heat on the other hand has a severe impact on battery life and it gets worse the higher the state of charge."
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post #18 of 25 (permalink) Old 08-31-2013, 07:19 AM
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Another site saying store batteries in 40% charge

http://www.wikihow.com/Store-Batteries
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post #19 of 25 (permalink) Old 08-31-2013, 09:15 AM
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I don't think you know much about the Prius and how it controls the battery...
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post #20 of 25 (permalink) Old 08-31-2013, 12:04 PM
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Originally Posted by firepa63 View Post
I don't think you know much about the Prius and how it controls the battery...
The management system charge the battery to max 80% and will not let it deplete below 40%. Not allowing the battery to fully charged and fully discharged will prolong battery life by not using up the charge/discharge cycles. However, that is not my concern. My concern is more about the chemistry of the battery in relation to heat.

Last edited by gaszipper; 08-31-2013 at 12:12 PM.
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