Better-Power High quality laptop battery for Acer Aspire 3100 3690 TM4220 4420 5100 5113 3100 3103 5515 5680 4200 4230 4280 BATBL50L6 BATCL50L6 BATBL50L4 BATBL50L8 5200mah (with samsung cells) with Samsung cells ,with high capacity, with high quality Over-charge protection; Over-discharge protection; Over-heat protection; Over-current protection; Short-circuit protection; High capacity circulatory function over 10 years' exprience of manufacturing battery Warranty: 1 year warranty, 30 days money return guarantee Manufacturer Directly Sell