amsahr Extended Performance Replacement Battery for IBM / Lenovo ThinkPad: S230u, S230u Twist, Edge S230u, ASM P/N 45N1092, FRU P/N 45N1093, 4ICP5/42/61-2 (4 Cell, 43WH) 18 Months Manufacturer Warranty, 100% Satisfaction Guaranteed ( A saving of $18.97 ). 100% Compatible Non-OEM : Lithium Ion (Li- ion) Long Life Battery: Rechargeable with No Memory Effect and Power Surge Protection. 43WH, 14.8 Volts & 4 Cell Protective Retail Packaging, Each Battery is Sealed with Anti-Static Shield Sleeve. Exclusive Offering of a Durable, High Performance, Extended Life Grade A Battery