ATC 9-Cell 7.8Ah rechargeable Battery Replacement for FRU 42T4502 FRU 42T4504 FRU 42T4513 FRU 42T461 FRU 42T4619 FRU 42T5233 IBM ThinkPad Z60m Series IBM ThinkPad Z61e Series IBM ThinkPad Z61m Series IBM ThinkPad Z61p Series netbook battery 100% Compatible - Will not void your original warranty Tech Rover&trade; Quality product with 30-DAY Worry-Free Return Policy Brand New High output Battery All Tech Rover&trade; branded items carry a 1 year warranty against manufacturer defects.