So my Acer Aspire V3-771G-9456 battery only lasts about 45 mins when unplugged now, so i went searching for a new battery. When I pull the old battery, it has 2 numbers on it, AS10D51(31CR19/66-2). When googling those 2 numbers i got a few different results and Some 10.8v and some 11.1v. Also they ranged from 4400mAh to 7800 mAh and 6 cell or 9 cell. Should I only be replacing with another 10.8v 4400mAh? Or can I buy a 11.1v 7800mAh 9 cell? I would love to have the extra run time of more mAh but if it hurts the laptop, its not worth it.