I hate to pay more in shipping than the battery actually will cost me.  Can you tell me where I can get a ULTRAFIRE 10440 AAA LI-ION 3.6V RECHARGEABLE BATTERY 500 MAH FLAT TOP CR10440 LITHIUM ION?  I tried Radio Shack in Kansas City, Mo but they didnt have one.  Also, what to do about charging the batteries?  Can you tell me, once I find the battery, what do I use to charge them?  I dont know if I will be able to build the charger that scubabatdan showed. I will be doing good if I can make his solitare mag lite mod!