Go to Amazon Sites : br br IBM ThinkPad SL400 Series Laptop Battery - Premium Bavvo? 9-cell Li-ion Battery br br High quality brand-new Li-Ion battery108V6600mAh9 cells br 30-Day Money Back Guarantee 1 Year Warranty br OEM compatible High capacity battery certified by CE and RoHS Guaranteed to meet or exceed OEM specifications br This battery is only compatible with following battery part No written on your original battery 40Y6795 40Y6797 40Y6799 92P1127 92P1128 92P1129 92P1130 92P1131 92P1132 92P1133 92P1138 92P1140 92P1137 92P1139 92P1141 41U3198 42T4504 42T4511 42T4513 42T5233 Before purchase please make sure all the technical specifications and the model No match with your laptop battery br If your original battery is a 6-cell battery this 9-cell battery has much higher capacity and works longer hours after each charge However it is bigger and sticks out due to the extra 3 cells It will still fit in your laptop