Don't get cheap batteries off eBay... Just get the good ones from iFixit

Mon problème

Got two batteries off eBay (each under $10); neither of them worked out well. They both never held charge well... so decided to spend $20 instead...

Ma solution

Easy as this is the 4th or 5th time replacing batteries.

Mon conseil

Do NOT waste your time (and $) thinking you'd get lucky and get a decent battery off eBay or Amazon for $10 or less.. it doesn't exist. Get a good one. iFixit batteries are legit. It is well worth it the moment you realize it can last 2 days between charges when minimally used. Now I don't have to replace this one for a while... Also I knew it was a good one (after have several knock-offs) when it took longer to charge. Cheap ones charge up very quickly because they drain very quickly as well...