I have half an hour fumbled on the parts until the batteries together with the new adapter were sitting in the garden of my parents Radio. The batteries do not lock into the adapter, they are just pushed and at the front is a minimal clamping effect, but nothing brings.
After all, the spring on the radio is sitting quite tight. Normally, one would now put the big Babyzelle the end of the spring and push it backwards; to a battery the next ransetzen equal and press into professional - even for that you need strong fingers. AABER: The issue here is not, because once the Eneloop including adapter is placed in the tray, the spring pushes the battery from the adapter out and you must start from scratch. I have worked with all the fingers, thumb and palm, until everything was sitting at his place - before the batteries and the adapter have me flown several times around the ears. As everything in it was quickly lid on it and fix it. I hope now that I have to repeat the procedure for a very very long time did not.
It is possible that it was the device - in the radio normally come in 4 baby cells, and the springs are large and rigid. Maybe that will be easier for other devices.
I would not buy the adapter again, but put on batteries (C cells) of other manufacturers - for the handling.
But I must say now that Eneloops sit on the radio - the radio is playing, the adapters do their job. No loose contact.
