maple classic™ 
should i spend $50 to get a new battery for my thinkpad 
note that the conversion rate from usd to brl is very expensive, so :/
@troubleMoney I would have! but sadly the x61t (tablet) ones specifically have a weirdly shaped battery with different shaped cells because of the screen swivel poking it at the middle
@squirrel oh ah, yeah, forgot yours was a tablet
incredibly silly suggestion
@squirrel well, those are probably 3.7v for the square ones, just replace those with 18650s and duct tape them to the outside!
@squirrel if you're feeling particularly brave you could try putting new cells in your current one
IIRC thinkpads use standard 18650 lithium cells