Info on commercial LiIon 12v batteries is available at:
http://www.ultralifebatteries.com/subcategory.php?ID=1.
We've been monitoring improving LiIon battery options for several
years (e.g., price per watt/hr, availability of light weight solar
chargers or ICs to build them). Some like these are starting to appear
as military surplus, but are not yet affordable on our budget (thus
the 'probably' in my previous message).Sorry if that was unclear.
An alternative described on the net exploits low cost remaindered
multicell LiIon laptop batteries and AC chargers to power field
recording gear.Bill R.
--- In Rob Danielson <> wrote:
>
> Thanks for the useful info, Bill. The portability looks terrific.
> Would take many square feet to charge a 10X 10,000 mAH D-cell pack in
> one day's sunlight, but recording off the grid might be doable with
> multiple, pre-charged packs. Can I ask where you're getting your 12V
> lithium 'brick' batteries? The ones I've come across in bulk have
> been fairly low capacity. Rob D.
>
> = = =
>
> At 9:14 PM +0000 10/6/05, werainey wrote:
> >An alternative to the inconveniently bulky roll-up flexible solar
panels are
> >sectional thin film panels on waterproof fabric. These are lighter
weight and
> >fold into remarkably small packages. A new generation of them is also
> >affordable and performs pretty well under cloud cover. To power
ultrasound
> >monitors we're using six 6-watt panels which each weigh 1 lb and
cost ca
> >$90. Panels up to 40 watts are still quite portable. One mfg with
product info
> >on their site is www.globalsolar.com.
> >
> >A 12V lithium 'brick' battery would have about the same bulk as
your NiMH
> >D-pack, but would weigh about half as much, have much lower self
discharge,
> >and probably cost something more than 4X as much.
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