Never used. I sold my laptop and a new battery was delivered I don't need. You can buy an unopened, as pictured, B31N1345 Laptop Battery for ASUS Transformer Book Flip TP500LN4510 TP500L TP500LA TP500LB TP500LN Series 0B200-00990100 (see full list of ASUS compatible machines below). New from Manufacturer, offers up to 500 recharge cycles over its lifecycle. Actual wear depends on how much electricity is required by the device and how you use it.
Battery type: Li-ion Voltage: 11.4V Capacity: 48Wh Cells: 3-cell
Replace Part Numbers: ASUS 0B200-00990100 B31BN9H B31N1345
Package Dimensions 12.8 x 6.8 x 1.1 inches | Item Weight 12.2 ounces | ASIN B07DVC5W3M
Lithium ion battery Compatible ASUS Models: