Go to Amazon Sites : br br Battery for Acer aspire 1640 3502wlci 5002 5002wlmi br br Battery Type Lithium-Ion - Capacity mAh - Voltage 148V br This Product has 12 Months Replacement Warranty br 100 OEM compatible Guaranteed to meet or exceed OEM specifications br Package Includes 1 pcs laptop battery br Note This battery is only compatible with 144V and 148V types