|Originally posted by ryanniedz
I had a car power adapter to go from dc to ac that was rated at 140 WH. This was more than enough to power the sager for a 20 hour car trip to south caroline and back. I would imagine that a battery rated the same, if properly connected, would do the same thing as the car battery converter. I am not gonna try it because the damn thing costs too much, but I would imagine that if you took the output of the battery and spliced it into an outlet, although not very safe or secure, would then power the otulet at 160 WH and therefore offer more than enough power for the laptop. I doubt very highley that tyou would get anything close to 16 hours, but an extra 3 hours I do not think is out of the question. I would be willing to bet that if you went out with a full charged battery you would have no problem getting 4+ hours of operation. Anyone willing to buy one of these things and experiment?
Wait, lemme get what your saying, cuz I don't think you said it right.
If you used a power inverter on the car battery, of course it will last, because the car has an alternator to charge the battery and run things when the engine is on...
Like I said, the pack linked in the original post of this thread was rated at 160watt hours. This wouldn't get you but maybe 3 hours of usage time, less if the main battery was being charged. Remember the sager is rated for 130watts max. 160Watthours/130watts=(roughly) 1.25 hours (and that is a minimum rating, because the 130 rating is a maximum).
Also, you have to keep in mind current draw. 130watts at 20volts equates to 6.5 amps. You will overload the cells at that rating and they could overheat and damage the battery overall.
If you wanna get 20 hours, your gonna need a car battery or something.
On that note, Sciplus sells a tractor battery for about $40. It is standard 12volt sealed lead acid, 46Amp hours. That would power a sager for at least 4 and 1/2 hours. But of course it weighs 40 pounds too http://www.sciplus.com/category.cfm?...3&category=134