This is a nice lipo charger that can accommodate a range of battery sizes from as small as 10 mAh to as large as 500 mAh. Buy this for charging smaller batteries (in the sub 100 Mah range, because this is one of the very few available anywhere). You can change current by using a small screwdriver to rotate the switch to the current you want to charge at (max two times your batteries mAh value). Comes wired with a USB plug and a 3 pin jack (see photos).

Instructions: When the battery needs charging the light will show red (charging). When the battery is charged it will show green. Note that you should charge the battery at 1C to 2C … so for a 30 mAh lipo you can use settings 1 to 4 (20-80 mAh) on the dial (I use a sharp knife to cut a square of the clear shrink plastic away so that I can see the dial better but this removes the protection of the clear plastic (I am ok with the tradeoff).