Or maybe retrofitting LiIon laptop batteries would fit our budgets?
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=1529&HS=1
Could one make a parallel wiring harness for two of these and get 8AH
at 16 volts for a 722/744? They'd weigh about 1/2 as much as NiHM.
They come with a charger too. The Ultralife LiIon bricks might be
mostly a military item at this point. Rob D.
= = = =
At 5:14 PM +0000 10/7/05, werainey wrote:
>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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