Description:<br> (Please check for the details and make sure this is the right one you need.)<br> INPUT SPEC:AC100-240V 50/60HZ 2A<br> charging voltage: DC42V<br> charging current: 2A<br> Charging mode: CC-CV<br> charge indicator:Red:Charging Green: Charged OK<br> Charger port: DC5.5mm*2.1mm<br> product size:132*57*32MM<br> Cable length: 39.4 In / 100 CM<br> security protection: OVP/OCP/ Overload protection/ Short-circuit protection<br> Packing: <br> 42v 2a battery charger*1<br> US plug cable*1<br><br> Fit for: all the 36V li-ion 5521 connector Li-ion / Lithium batteries<br> Don’t use if your battery connector or polarity not fit.<br> Don’t use for Lead Acid battery packs.<br> Don’t use when the environment is wet.<br> Cut-off the AC when the battery is full charged.<br> Don’t charge when the battery is broken.<br> Monitor the temperature of the battery the first time you charge. If the temperature is too high, cut off charging immediately. Feel free to let us know if you have any problem.<br>