Extra 12 volt battery
Anyone carry a cheaper 12v car battery in case regular battery won't start vehicle. I have a conversion van made into a camper. Also have an extra interior battery, charged by solar, to run various( ...
Forum Discussion
CavemanCharlie wrote:nevadanick wrote:
I have one similar to this http://www.cnet.com/news/pocket-sized-jump-starters/
Have you ever used it?
I didn't think battery technology has come that far along yet to be able to make it that small.
I'm doubtful. Interested ! but doubtful.
These are 6AH or 12AH batteries, or about 75 or 150 Wh. When you compare the energy density and physical dimensions to laptop batteries or lithium ion cordless screwdriver batteries, it's not really unbelievable. These just happen to be able to be discharged at a very rapid rate without (undue) stress/damage; but obviously they can't sustain that for very long without running out of juice.
