Make of your standard AA battery a mono-c battery.

Normally the fat batteries are more expensive and often less capacity than their thinner brother AA. This adapter make from your AA battery a thick mono-c.

The benefits are great, you do not need extra batteries to buy, simpel use your existing. And not forget, the most battery chargers can not charge mono-c or mono-d batterys. With this adaptor this problem is solft.

Batteries not inclucief