I Hv changed mine 3 times, 1st time under warranty fr TC, 2nd time changed by TC towtruck at special price, 3rd time luckily oso under warranty (as 2nd batt not yet 1 yr). Anyway, all 3 times noticed hard cranking when starting the car, took longer time than usual.. and pls DONT DOUBT this symptom/ problem, change immediately while u still can start/drive the car to any shop to change when u notice this before it dies on u.. :) My 2nd time was I keep on delaying for 2 - 3 days until it died.. hehe..