Preparation for 1month storage
I'll be heading back home for college break for about a month and plan to leave my 2010 FEH at university. I'm worried about discharge of the HV battery while I'm gone, as to my knowledge NiMH batteries generally discharge pretty quickly. The battery is in good health, although obviously not brand new; I'm not sure what the exact capacity is, but I would estimate it at about 50% of design at least (likely more).
Is one month long enough for self-discharge to deplete the battery? I have ForSCAN, so I can always run a balance to charge it up past 50%. I'm also open to building a jump starter, as I want one anyway to have in case the battery craps out. The few options I were considering were:
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Re: Preparation for 1month storage
Good luck buddy seems that you're on the right track
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Re: Preparation for 1month storage
Originally Posted by waterlubber
(Post 277621)
I'll be heading back home for college break for about a month and plan to leave my 2010 FEH at university. I'm worried about discharge of the HV battery while I'm gone, as to my knowledge NiMH batteries generally discharge pretty quickly. The battery is in good health, although obviously not brand new; I'm not sure what the exact capacity is, but I would estimate it at about 50% of design at least (likely more).
Is one month long enough for self-discharge to deplete the battery? I have ForSCAN, so I can always run a balance to charge it up past 50%. I'm also open to building a jump starter, as I want one anyway to have in case the battery craps out. The few options I were considering were:
Disconnect 12V Disconnect HV harness Disconnect data cable. Remove service plug. NiMH is over-charge tolerant. A full charge from empty to full would take 24 hours at the typical 350mA constant current charge, and it should only be done with the battery cover OFF and a box fan blowing down through the cells. |
Re: Preparation for 1month storage
Sounds good. What's the typical % SoC self-discharge, month to month on these batteries in that configuration? My main worry is that, given that this is a very old battery (13y), the capacity loss from age would mean it would self-discharge below starting threshold in storage. (Alternatively, how long can I expect to let it sit like this before it's too dead to restart the car?)
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Re: Preparation for 1month storage
Originally Posted by waterlubber
(Post 277631)
Sounds good. What's the typical % SoC self-discharge, month to month on these batteries in that configuration? My main worry is that, given that this is a very old battery (13y), the capacity loss from age would mean it would self-discharge below starting threshold in storage. (Alternatively, how long can I expect to let it sit like this before it's too dead to restart the car?)
It's a legit worry. I've supplied you with the process that minimizes the potential for self discharge. It either will or won't make it. |
Re: Preparation for 1month storage
Originally Posted by S Keith
(Post 277627)
Run balance. Terminate it prematurely when you hear the engine transition from being loaded to being driven.
Disconnect 12V Disconnect HV harness Disconnect data cable. Remove service plug. |
Re: Preparation for 1month storage
Originally Posted by PTTech
(Post 277689)
Can you go into more detail about disconnecting the data cable on a 2008 FEH? Not sure where this connection is. Is it important to do this in a particular sequence?
Run balance. Terminate it prematurely when you hear the engine transition from being loaded to being driven. Disconnect 12V Remove service plug Disconnect HV harness Disconnect data cable. Data cable is the large square plug connected to the front of the battery on the driver's side. 10mm bolt to remove. |
Re: Preparation for 1month storage
Originally Posted by S Keith
(Post 277690)
Order:
Run balance. Terminate it prematurely when you hear the engine transition from being loaded to being driven. Disconnect 12V Remove service plug Disconnect HV harness Disconnect data cable. Data cable is the large square plug connected to the front of the battery on the driver's side. 10mm bolt to remove. |
Re: Preparation for 1month storage
I would get a good battery maintainer for the 12v battery and leave it connected for the month. You can use a small solar panel as well. When you return, see if it starts. If not, there is a button on the passenger side that you press and after about 8 minutes or so, the 12v battery gives the hybrid battery a kick start. That button is discussed in your owner's manual.
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Re: Preparation for 1month storage
Originally Posted by kshaw
(Post 277709)
I would get a good battery maintainer for the 12v battery and leave it connected for the month. You can use a small solar panel as well. When you return, see if it starts. If not, there is a button on the passenger side that you press and after about 8 minutes or so, the 12v battery gives the hybrid battery a kick start. That button is discussed in your owner's manual.
A good battery maintainer is a good idea, the solar panel is not for a battery that won't be monitored. It can overcharge the battery as it will continue to charge a fully charged battery. |
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