Ram backup battery question,

[Harry Bissell]

Lithium!

the NiMH battery excells in supplying LOTS of current and in the
ability to be recharged... need that for a laptop (or cordless power
tool)

the Lithium excells in Low self-discharge and flatness of discharge
curve,
and is best for those low (like zero) current drain apps like memory
backup.

And why recharge when you don't have to (for the next 10-15 years...)

H^)

Theo wrote:

> Hi, list. I'am looking for backup batteries for some low-voltage cmos
> ram.Never used low-voltage devices before and wonder what way to go.
>
>   1. Is there a special data retention mode like on old fashion cmos?
>      If so, what will be the maxium backup voltage
>      (the devices operate normal down to 2.2V).
>      The data sheets I have are not clear about this point (if the
>      point still exists o'cause).
>   2. What should be the better pick: NiMH or Lithium?
>   3. Also in the case of NiMH:
>      Some packs list 20% of the capacity for 7 hours for optimal
>      loading,
>      others 1mA continues charge.
>      Does this matter or can both methods be used on all NiMH's?
>
>  Cheers Theo