Very effective universal charger

WARNING: The charger has a NEMA-1 (type A) connector, as used in the United States. Since the unit with voltages between 110V and 220V can be supplied, you need only an adapter like this

Because the charger and adapter are called come from China, you should be prepared for a three weeks until delivery.

The batteries can have a length of 22mm-72mm have (after you've discovered that you pull the lower spring retainer 180 ° to rotate for smaller batteries. The rotation mechanism makes the use of the battery bit fiddly, but it still goes.)

Conclusion: For this price quite good, if you have a plug adapter lying around. If that is still too expensive, you should look in a china online store.