My L550 can last an impressive 4 days before dying, but I could only discover this once. This phone took 8 hours to charge 18% overnight. It charges so slowly that if I am just checking the time on it every ten minutes or so whilst it's charging, it will continue to lose charge.
I have tried other chargers but there is little difference. Plugging the phone into my computer doesn't help either as it still just loses charge.
Do I need to replace the battery? Or find some magical super-charger? All the reviews of the phone I found talked about the battery charging "in a few hours" - hopefully "few" here didn't mean 40.