Eric Laforest wrote: > <snipped> > On Thu, Jan 06, 2000 at 01:56:35PM -0500, Steve Mann thus spake: > > >Has anybody looked at the batteries used for profesional video > > >equipment? > > <snip> > > > now that the sony li-ion camcorder batteries are so readily > > available in the marketplace, it seems that these are the best > > option. > > I use gel-cells since I can easily charge them in the field. > (I have a voltmeter on the power line to monitor operating voltage) > I'd love to use Li-Ion for weight/capacity, but AFAIK these require > a microcontroller to charge them else they get killed. > I want to use one set that is field-recheargeable and not have to > keep a second set in a charger base at home/office. > I could homebrew a Li-Ion charger with the appropriate charger chip, but > are there some Li-Ion batteries that have such smarts built-in? BenchMarq, National and Maxim make such charger chips, others probably as well. Usually surface mount IC's, they can be small <G> Another thing to consider are the laptop "emergency backup battery" chips - they give you higher voltage off a smaller battery, for while you're changing batteries (could use a very small NiMH pack for this.) (I'm looking at faster charging of gel cells, any good URL for that?) > > the big battery packs, battery belts, etc. are so reminiscent of > > 1970s --- great for a first generation wearcomp of the '70s, but > > probably overkill for seventh generation computing in the '00s. > > Awww...but '70s overkill engineering is fun...;) > and think of the uptime or additionnal peripherals one can use > with such massive packs. > BTW: how much do those things go for typically? You can get a lot of AH for little money; 4.5 AH for $7ish on sale, pretty often; 17 AH for $42 or less; etc. Look for bargains, on these. $2/AH is about the right rate to beat, lower than that is better. > > steve > > > > http://wearcomp.org > > http://wearcam.org > > http://eyetap.org Mark -- I re-ship for small US & overseas businesses, world-wide. (For private individuals at cost; ask.) -- Subcription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" toWear-Hard Mailing List Archive (searchable): http://wearables.blu.org
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