Stay unplugged for longer with the 35 6 cell thinkpad x 121e x131e and x130e battery this rechargeable six cell battery uses advanced lithium ion li ion technology and can be used as a replacement for ageing system batteries or as a convenient spare each one is compatible with the x121e x130e and x131e systems the voltage is 108 direct current and 78 ampere hours while the battery life lasts for 8424 watt hours the battery utilises over discharge protection to ensure a safe flow of p