>-----Original Message-----
>From: piclist-bounces@MIT.EDU [mailto:piclist-bounces@MIT.EDU] 
>Sent: 15 December 2005 13:18
>To: PIC List
>Subject: [EE] Battery choices
>
>
>
>Lithium Ion. Cost?
>Capacity degradation with time regardless of usage.
>Goodish self discharge.
>
>Lithium Ion Polymer - better self discharge than Nickel chemistries. 
>Wide voltage swing charged to discharged.
>Price ?
>

SLA sounds by far the most suitable choice for this application.  I guess weight and volume are of secondary importance.  Li-Ion chemistries seem to be overkill IMO, given the far more strict charge/discharge regime you need to stick to.  The polymer batteries are now getting pretty cheap, but they suffer from much the same disadvantages of regular Li-Ion except they are inherently less safe and more likey to rupture ("vent with flame") if abused.

Regards

Mike

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