Check the math for the PP3, I make it 5.625 WH

  PC

> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Michael Rigby-Jones
> Sent: Friday, July 01, 2005 11:20 AM
> To: Microcontroller discussion list - Public.
> Subject: RE: [EE]: How to efficiently run a PIC from 12V battery?
snip

> 
> Not really a fair comparison though, i.e. switcher vs. linear.
> 
> >From the Energizer web site, and ignoring voltage drop over life:
> 
> 1x Alkaline PP3 625mAh  Total energy = 14.4 Wh
> 2x Alkaline AA  2850mAh Total energy = 8.55 Wh
> 
> A PP3 has a significantly higher energy density than 2AA's, 
> so with a suitable buck regulator it may last quite a bit 
> longer than AA's dependant on current draw.  The downside is 
> cost, 9volt "block" batteries such as the PP3 are 
> significantly more expensive than AA's.
> 
> Regards
> 
> Mike
> 

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