This is a broad question since I did not specify what type of rechargeable battery. I have just started using rechargeable 18650's (EagleTac 2400mAh) and the new AW R123 Li-Ion Rechargeable batteries. I am using a Pila charger for these. I am wondering about leakage, because one of my 4D cell Maglite's wasn't working and I decided to check the batteries. When I took the tailcap off I could see lots of leakage and what is worse, I cannot get the first battery in the end to come out. Now that I am about to switch over to rechargeable batteries for everything I own, I am wondering if I will encounter this problem with rechargeables.