Laurie Thecharger supplied will charge all four at once, or any combination of 1-4. The current from the USB port when charging 4 is about 1.3A, so I conclude that about 300 mA is going into the battery. If you charge just one, the current is a little higher, about 400mA. This is a bit less than you could charge these batteries at, but it is better to be too low than too high. It's a useful charger, and could charge other batteries with the same plug but I would not recommend using it for batteries less than 300mAh. I should also mention that the batteries I received were all very close to the ideal storage charge voltage of 3.8V. So although as jj604 has found the C rating is fictitious, if your plane or quadcopter doesn't require more than about 3A they are perfectly adequate.

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