I can only talk about the "D Cell" battery of the original Prius, I have
worked on many of those, changed many cells, tested them to see what is
wrong, etc. I have not seen ANY lose capacity. What happens is some cells
suffer from increased self discharge. I measure at 1.270 V, this is about
where they are normally. Leave it charging at this voltage on a precision 4
wire charger until the current stabilizes. A good cell has 0.01 mA leakage,
one that causes a problem will be 5mA. Some cells are 50mA.
When a car has been driven until the wheels stop turning the pack is
wrecked, most of the cells are bad, many have leaked. I think this a due to
overcharging. Any cell that gets reversed very quickly loses electrolyte,
avoid these conditions and they have a long life, of course it it the best
cells that are damaged by overcharging. I have one car that still has the
original battery apart from a few cells I have changed, this was made in
1998. The Prius has no balancing mechanism, apart from charging the whole
pack so that the high cells are overcharged.
-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Michael Ross via EV
Sent: Thursday, 11 September 2014 2:12 p.m.
To: Jan Steinman; Electric Vehicle Discussion List
Subject: Re: [EVDL] BiPolar NiMH (was: Kawasaki Concept J 3wheel GIGACELL
powered EV)
LFP I know about, and they can provide more than 2000 cycles if you make the
same sort of effort as one does with Lead. Charge them right, don't run
them too low, ask too much of them when they are cold, etc. You can ruin
any battery. There is a loss of capacity if LFP just sit, of maybe 1% a
year (I am reflecting some stuff I saw on EVTV), number of cycles does not
degrade. I make a distinction between the aging/degradation and misuse.
On Wed, Sep 10, 2014 at 8:34 PM, Jan Steinman via EV <ev@lists.evdl.org>
wrote:
> > From: Bill Dube via EV <ev@lists.evdl.org>
> >
> > NiMH has been largely eclipsed by Li-Ion.
>
> Except in lifetime. Nickel technology is 3,000+ charge/discharge
> cycles if well cared for, Li-ion what, 1,000 max? And nickel cells
> have about the same capacity until they seriously break, whereas Li-ions
"degrade," no?
>
> :::: You can't solve a problem with the same kind of thinking that
> created it in the first place. -- Albert Einstein
> :::: Jan Steinman, EcoReality Co-op ::::
>
> _______________________________________________
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>
>
--
Put this question to yourself: should I use everyone else to attain
happiness, or should I help others gain happiness?
*Dalai Lama *
Tell me what it is you plan to do
With your one wild and precious life?
Mary Oliver, "The summer day."
To invent, you need a good imagination and a pile of junk.
Thomas A. Edison
<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html>
A public-opinion poll is no substitute for thought.
*Warren Buffet*
Michael E. Ross
(919) 550-2430 Land
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<michael.e.r...@gmail.com>
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