New genuine Dyson V11 (SV15) - V15 clip in battery replacment. Pleas enote if you have a screw in battery for your Dyson V11 this will not fit, please selcet the 'Dyson V11 Battery'. 
 
* Do not leave your cordles Dyson on charge all the time. They only take 3-4 hours to charge, once fully charged switch them off at the plug socket to prolong the life of your battery*