Model Type: 18650 3.7 4400mAh battery With JST XH-2P/2.54 forward plug. plug size will show in our listing picture. SIZESize: 2.66*1.46*0.73 Inchs XH plug size0.223x0.155Inchs, please don't cut the wire if the battery plug not correct, so we can full refund for u if return. KNOW BEFORE USE 1.please contrast with the old battery and check the polarity of the battery. Red wire connection power positive " +" , Black wire connect power negative pole "-". if is a reversed, you need position of interchange wires. otherwise device will demage. POSITION OF INTERCHANGE WIRES -- If the polarity of the red and black wires are reversed, you need to exchange the position of the plug wires, You will need to take the wires out of the plastic plug and reverse them only. To do this, take the small blade you own, very gently pry up the two plastic tabs on the top of the plug one at a time, and gently pull the wire out of the plastic plug.( Don't yank!) KNOW BE