On 2013-07-18 12:37 PM, RussellMc wrote:
> Not I.
>
> Buy 7Ah LiFePO4.
> High up front cost.
> Lower whole of life.
>
> Note that NiFe has poor charge efficiency and high self discharge FWIW /
> AFAIR.
>
> Last forever :-).

I'm looking for some for lighting/power tool use in a barn ~100m away
from the house over rough terrain. Don't want to run a 100m power cord.
I don't need 100Ah, and there will be solar panels to charge the ~10Ah
batteries. Will probably stack batteries from ~100-130V. Lights are
LEDs, some tools are series wound, some permanent magnet DC with a
bridge rectifier, so everything will run on DC. No need for an inverter.
Stacking 100Ah NiFe cells to any reasonable voltage will be very
expensive.

LiFePO4 sounds good, always wanted to use these in things. But I really
like the fact that NiFe will last longer than me.

Do you, by any chance, know the standby/shelf life of LiFePO4 batteries?

On a different note, I found some 15-year-old NiCd batteries that not
only have held some energy, but are *still* able to hold their rated
capacity. Ah, why is everything toxic so useful?
--=20
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