It has a 9V bulb that will go :poof: if you use 3x 3.6V rechargeables since that would be about 12.6V fresh from the charger. You can use 2x 3.6V rechargeables if you use 17500 - if they fit the light.
I assume you are talking about 3.6V RCR123 rechargeables? In that case the setup would be about 12.6V fresh from the charger as mentioned, not 10.8V. These cells are charged to ~4.2V.