I have a streamlight stinger xt with no charger it does have a battery tho. How much do chargers cost to charge the battery ? I tried to use 18650 batts but there way too small and i think the voltage is too high. Can a cr123s fit inside ? How many do i need to use this light ? I have lots of 18650 chargers so im going to assume cr123s battery's will work on the chargers ?