The LED "CHARGER" flashes in green and red alternately when the battery is almost achieving maximum capacity (over 90%). The LED "CHARGER" will lights green when the charger completed the charging process.1g222 battery|21KEV|440264-ABC battery|412779-001 battery|312-0513|312-0292 battery|381373-001 battery|PA3154U-1BAS battery| All of our batteries are manufactured with high quality cells, which may not be the same material as that in OEM batteries. Actually, almost all electronic device manufacturers do not produce the batteries used in the devices. They all have to be manufactured by outside battery manufacturers. Therefore, there's no difference in turns of quality and reliability. Our aim to provide the best quality and high-performance batteries to our customers, we have adjusted the batteries' internal resistance for more stable and more reliable. As a result, there will be a little bit difference in our batteries run-time comparing with the OEM batteries' (no more than 10%). Laptop Batteries|