I tried a couple of different rechargers before I found this Energizer, pictured above. It's small, lightweight, and will charge both AA and AAA batteries. The tray retracts when the batteries are removed. Best of all, it works on international current. Just plug it in, pop the batteries in after a day of sightseeing and they're ready to go the next morning when I am. I just plugged the charger right in when we were in Beijing -- China has about five different plug types, so I was lucky. I did have to get an adapter to use it in England.
I paid about $10 for it at Wal-Mart. Rechargeable batteries cost about another $10 for four. I have eight batteries because I travel with two digital cameras plus my husband has a camera. I always carry spare batteries with me in case the ones in the cameras run out of juice. I find I can get about 300 photos on a single charge. This charger paid for itself abut halfway through the first trip I took it on.
China
If you're planning a trip to China, please check out my website about travel in China, especially Beijing. For a list of my China guidebooks, please check out Cheryl's Guides. Or you can go direct to GuideGecko.com and buy them there. If you have questions about travel in China or my guidebooks, please feel free to email me.
The fine print: When bloggers endorse a product now, the FTC requires them to disclose if they make any money from the endorsement. I don't. This battery recharger is such a great product, I think everyone should have it!