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Just got a 2nd hand Dell D400 which im very happy with, but... as expected the battery life is poor (an hour).

I have been looking online ebay) and seen batteries with capacities of 1900mAH, 3600mAH and 3800mAH.

I believe the battery i have on the Dell is the 1900mAH and im also guessing its the standard battery.

My question is... if i purchase the 3800mAH what kind of battery life should i be expecting on average If im getting about an hour on the standard 1900mAH and the stated battery life (taken from kelkoo ) is 4 hours.

Another question... does the 3800mAH weigh more? and is it physically bigger?

Hour and a half to hour and 45 minutes... 2 hours with luck.
That is an old laptop, and it hogs a lot of power for its small size.

Hour and a half to hour and 45 minutes... 2 hours with luck.
That is an old laptop, and it hogs a lot of power for its small size.

The batteries are the same size when specified for the same laptop. They just have more cells... cheap ones have 3 to 4 cells. Better ones have 5, 6, on up to 9 cells... all at an increased price.