Pika, the risk of sounding picky, if those AA's you bought were primary (non-rechargeable) cells they were not Lithium ion , just Lithium. There is a difference. There are true Lithium ion rechargeable cells in AA form but their voltage is much higher. Li-ion chemistry is what you will see in most cell phone and proprietary rechargeable camera batteries.

Sorry to be so darn nikpicky but this stuff is my hobby <img src="/forums/images/graemlins/tongue.gif" alt="" />