so i just bought an rv and i found a stinger under the driver seat. no charging cradle or anything. when i opened it up its got some type of proprietary battery. i went online and its a 3.6 volt system. so the battery is really dead i didnt put it on the dmm but it will light it up for only about 10 seconds before dying. if anyone is familiar with this light is it really 3.6 or 4.2. i can make a sleeve to put an 18650 in it but i dont want to blow it up. the weird thing as weel is its got an xp-g or xp-g2 in it and it looks like its 20 years old.