What kind of rcr123 were you using? Watch out for all the ones that end in fire. Also, most of those coming off the charger are at 4.2v instead of 3.2v if the cr123a. So that's a difference of 8.4v to 6.4v. Might be fine but you never know until it breaks. Also, those lithium rechargeables will drop a bit after a while when not in use.