[HomeBrew] External battery supply for laptop

[Elliott Olson]

Hello homebrew,

I've seen DC-DC adapters that will boost 12v to 15-20v for laptops.
Radio shack has one and you can also find them on ebay. This way, you
could use a regular 12v battery/pack and easily recharge it.

Saturday, July 17, 2004, 10:17:13 AM, n6kyr wrote:

nnn> All:
nnn> I would like to build an external power supply for my laptop (15 VDC). It needs to be rechargeable. I would like to use readily available components. So far, I have a few choices (maybe you can
nnn> expand on some):

nnn> 1) rechargable NiCad C cells with 2.5AH (max recharge at 1.2 VDC)
nnn> 2) ditto except at 4 AH
nnn> 3) a pair of 7.2 VDC 2.5 AH RC batteries hooked in series

nnn> I'd like to recharge them not only at home but also on the road via my car. I saw some special rechargers but quite frankly, $100 is not my cup o' tea. 

nnn> My plan is to get a plain jane Rat Shack multiple adaptor for the car and recharge a set of batteries (in parallel) at the 7.2-7.5 volt setting and then reconnect in series when powering the
nnn> 'puter. 

nnn> Let me know and thanks. Cal, N6KYR. 



-- 
Best regards,
 Elliott   N0UKF                      mailto:n0ukf at wiktel.com
www.qsl.net/n0ukf/