its my experience that 2500mah have quite a number of problems in less than 3-6months
(carry much much less power after a day of being charge).
example i have a 2500mah when its new i can use the battery like 2 or 3 days after being charged with near full capacity.
after a month or so of being used regularly, if i charge the battery more than a day ago the charge would be nearly gone.
a number of the 2500mah batts became unusable after a few uses (a month or so)
so far only those 2500mah that came with the chargers seemed fine (MP brand)
however those 2500mah batts that came with the sanyo and uniross chargers also had problems in the later batch.
many single and blister pack of two and four have problems a well.
ive replaced as much of the defective 2500mah batts but now i prefer not selling them anymore till i get a good test batch.
less returns...the better...no retuns...the best!
ive been selling 2100 and 2300 longer than ive been selling 2500. so far not a single 2100 and 2300 batts have been returned.
ay meron pala 1pc of 2300 na defective before but that was just one piece.