The inov8 universal battery charger features an easy to use sliding design to fit to your battery automatically identifies the battery voltage and polarityrrcapable of charging aa aaa batteries plus 99 of all 36v 37v 72v 74v lithium ion batteries this inov8 battery charger is a truly universal chargerrrspecificationsr li ion battery 36v 37vr li ion battery 72v 74vr nimh battery 2x aa 28vr nimh battery 2x aaa 28vrra handy lcd screen lets yo