(Pack of 6) C Battery Adapter, AA to C Battery Adapter Converter Spacer, C Size Battery Adapter

These fit AA batteries perfectly. Rechargeable batteries are a tighter fit but if you're patient you'll be successful. I use these in an old school boom box and and it powered the CD player for 6 hours at half volume.

Worked as well as more expensive products.

These adapters work great to convert an "AA" battery to “C” size, and the Product description is accurate except for one thing I will talk about later. Most important to note is the size of the "AA" battery you will use. They say, "it doesn't fit some rechargeable batteries", and they are correct. There are 3 grips that hold the "AA" bat, and 6 adapters measure between 0.542" - 0.552". I used a standard alkaline battery which measured 0.538" dia. and it fit perfect with all 6 adapters. I also tried an extended capacity rechargeable that measured 0.568" dia. and it does not fit 2 of the 6 adapters, but does fit very tight in the other 4. Another consideration is the weight of an AA battery in the adapter. I measured a standard alkaline "AA" battery with the adapter at 0.74oz/21g. The standard "C" size alkaline battery that I have measured 2.5 oz/70.9g. I gave 5 stars because they work well, are built solid, and they do point out the size and weight limitations.One error I found in the description is, “Weight of c cell battery adapter: 0.25oz/7g”. It should say 2.5oz/70g which more closely matches my measurements.

Worked well in my closet light. Keeps me from having to stock C size batteries

Brilliant idea whoever thought of this. I use these for everything thing that takes C batteries.

All you have to do is add a AA battery inside this and it acts as a C battery. I have many of them, In case of emergency like a hurricane they will help enable powering of the radio.

As with the other reviewer, the 6 adapters I received had an opening size between 13.8mm to 14mmI believe 14mm is the standard since that was the size for duracell (basic) and insignia (best buy brand) non-rechargable batteries that I had. The 3 plastic 'springs' are very stiff and when I put one of ikea rechargeable batteries through, it scraped off the exterior coating at the 3 contact points.I also measured some rechargeable batteries I had on hand:- amazon basics 2400 (grey) is 14.3mm- ikea ladda 2450 is 14.2mm- eneloop HR6 19000 (both old white ones and newer blue ones) is 14.1mmAn alternative to this (though more expensive) are the eneloop spaces, the springs are actually springy so can accommodate the slightly bigger size.

Worked great