Here's the batteries I use for my Dinotte XLM-3. They are RC batteries with nominal 7.4v. I got a 2 pack, with two 5000mah batteries, for $39 from Amazon. These batteries, like most RC batteries, use Tamiya connectors. To connect with the Dinotte (assuming your light is similar), you will need a 2.1x5.5mm DC female plug (about $3 each) for the battery. I think I used 18awg size. I connected the 2.1x5.5 to the Tamiya which then allows the light to connect to the battery (as shown in the top of the image below). An easier approach is to remove the Tamiya connector from the battery and attach the 2.1x5.5mm dc female plug directly to the battery wires so the light and battery connect without need for the Tamiya connection. See bottom part of image below. I think the Dinotte charger will work for this battery, and I think I used my Dinotte charger as a test, but I also bought Tenergy TB-6AB Balance Charger Discharger ($40) for use with these batteries. Since these batteries do not attach to the frame like Dinotte batteries, I sometimes carry the battery in my handlebar bag or in a waterbottle bag attached to my handlebars.