Stay unplugged for even longer with thinkpad battery 19 the perfect replacement battery for your x220 or x230 series lenovo notebook this rechargeable 6 cell slim 64 wh external battery uses lithium ion li ion technology and easily attaches to your x220 system it is fully compatible with x220x230 and x220tx230t thinkpads it allows direct charging from an ac adapter 65 w 90 w 135 w no external battery charger needed it offers over discharge protection as standard for system secur