eneloop Panasonic BQ-BS2E4SA C Size Battery Adapters for Use With Ni-MH Rechargeable AA Battery Cells, 4 Pack

not practical, difficult to fit

Works as expected, even on other brand batteries. That said, some AAs are slightly-longer than C-size, so you may crush the spring clips in your device when using these.

This worked like a charm! Much easier to use common batteries AA than C for just the odd cat toy! Quality is good fit in good worked great. Happy with this product.

Excelente producto!! La mejor opción ya que no existen pilas recargables en el mercado tamaño C (al menos en Mexico) cumplen perfectamente bien su función, las recomiendo ampliamente!

I hate C batteries with a passion normally reserved for animal abusers and blizzards, but we needed a few for our new Surefeed Microchip Pet Feeder. Rather than buy a bunch of disposable C's, I decided to buy these adapters so I could use my existing Eneloop batteries. Simply slide them into the C adapter and you're ready to go.

Very nice quality. Exactly as described and shown in the ad and definitely not a cheap knock-off. The AA batteries fit in perfectly. I would buy these again. For those who don't know, these sleeves allow you to use AA batteries to power a device that usually take the bigger C size batteries. The voltage is the same, just the capacity is smaller, meaning the batteries will go dead and need replacement/ charging quicker that if using the full size batteries, but it's a small price to pay to not have to go out and buy a whole lot of C size batteries. P.S. if you're buying rechargeable batteries, do yourself a favour and just buy Panasonic Eneloop standards. They're the best and not all that more expensive than the cheapies.