AA Battery Holder (lockable) for Rechargeables

For the rechargeable batteries I designed a holder. By rotating the top part, one battery can be removed at the time. If all batteries are loaded or empty, the top part can be put into an intermediate position and it will lock all the batteries inside. No risk for loosing uncontrolled battery/ies. Like this they can be stored.

You need 1 screw of M3 size

Design is inspired by the fact, that my son has a little RC car which is truly energy-hungry and I need to hold one set of spare batter