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From: jws@cica4.mlb.semi.harris.com (James W. Swonger)
Newsgroups: sci.electronics
Subject: Re: Best way to power a hungry halogen bulb?
Message-ID: <1991Feb13.134907.20122@mlb.semi.harris.com>
Date: 13 Feb 91 13:49:07 GMT
References: <1991Feb13.033718.11978@ecf.utoronto.ca>
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 Try four AA NiCd batteries. Nominal voltage will be 4.8V; the package will end
up about 1"x1"x2". AAs are usually about 450mAH; the "9V" cells are about 75maH
as I recall. 

 If you take apart the generic "9V" you will find 6 small cylindrical cells.
Cutting the connection and using four removes the need for the dropping diode.
You still end up with a lame battery. The newer 8.4V batteries use a stack of
flat cells specially designed for the "9V" application rather than the cylinder
sort which seem to be Q&D adaptations of the AA, cut off at the knees.