The points about the Prius Nimh are they tick all the boxes:
Independent tests (digital measuring devices, a range of tests) show
even 6 year old packs have lost very little capacity - the cells are
high quality;
They have a BMS;
They have a cooling system.
Not perfect but maybe a cheaper option for some.
I sometimes wonder if all Nimh packs had had BMS's as they should have,
would they be far more popular?
On 15/06/2012 11:59 AM, Craig Carmichael wrote:
> nd even the low density LiFePo carry more charge per pound. But if
> >I can't talk you out of wanting some Ni cells stop by any Vectrix
> >forum as many of us are switching to lithium you can pick up used
> >cells on the cheap.
>
> A typical NiMH AA cell is: 1.2 V * 2.5 AH / 30g = 100 WH/Kg.
>
> A NiMH D cell is: 1.2 V * 10 AH / 163g = 73 WH/Kg.
>
> (Derate for weight of packaging & connections.) The D cells handle
> higher currents - more than 4 * the AA cell.
>
> A spec I saw for some LiFePO3 - a while back - was 60 WH/Kg.
> and for some flooded NiMH, also a while back, also 60 WH/Kg.
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