C Size Battery Adapters, AA to C Size Battery Spacer Converter Case Use with Rechargeable AA Cells - 4 Pack

About battery cell adapters..... Adapters such as these are simply a sleeve to center an AA cell in a compartment sized for a larger C cell. In order to work, the contacts on the device must be able to meet with the smaller diameter ends of an AA cell. Several other reviewers mention this. With an AA cell in hand, you can generally "eyeball" whether this will work by inspection before purchasing. For spring loaded devices, pushing in the adapter with its AA cell will sometimes result in the AA cell pushing through the sleeve. With multiple cells end to end, this can be a frustrating task. This can sometimes be corrected by wrapping some tape around the AA cell to increase the friction. If you can get this system to work, there are other considerations. An AA cell usually can't provide the amperage of a C cell so, some devices may deliver neither the brightness nor volume, etc. expected. Other devices may not work properly at all. Also, an AA cell can't provide the amp-hours that a C cell does thus, operating times may be shorter. I use these adapters with non-rechargeable Lithium AA cells (or, AAA cells, see below) in my seldom used equipment such as an emergency radio or lighted precision reticle since the Lithium cells are less prone to leakage, over time, than alkali batteries are, and, to my knowledge, are not available in C size yet. It seems the non-rechargeables are only available in AA, AAA, and 9v. That's where these are a good workaround. Another alternative is this adapter which I have also used. https://www.amazon.com/dp/B0851DLJ3T?ref=ppx_yo2ov_dt_b_fed_asin_title Here a combination of multiple AAA cells can be used (in parallel) to replace a C cell in many cases equaling, or exceeding, the C cell's original capacity. While contact alignment is not generally the issue, size may be. If the device using C cell compartment is tight from a diameter perspective, sometimes these adapters, with a full capacity of 4 AAA cells, will not fit or, will get jammed and difficult to remove. These adapters also introduce a third metal to the circuit. There is now the additional risk that different metals in contact with each other (essentially forming a "battery" in their own right) will begin an electrochemical reaction resulting in oxidative corrosion. Again, your mileage will vary. Both of these adapters have their function and purpose. They may well work for you. Hope this helps.

These are pretty basic, a plastic sleeve that slips over an AA size battery so they fit in place of a C battery. They work flawlessly in this regard, with the AA battery fitting inside snugly. The plastic feels strong, not like it will crush or fall apart easily, so I expect they should last a long time. They're working well for allowing me to use AA NiMH batteries in an old radio that takes C batteries, resulting in my not having to have specific batteries and a charger just for that radio. Well worth the price for that convenience.

These sleeves work great for using AA batteries in place of using C batteries

It is nice that rather than having to have multiple different sizes of batteries, I can just buy a lot of AA's and use these in items needing D batteries. Very convenient. However, you do have to keep in mind, D cells have a much higher MaH capacity, in the area of 9000 to 12000 MaH, whereas AA's maybe max out around 2800 MaH, so the batteries will not last as long in these adpaters, but if you use rechargeable AA's, no big deal, you just pull them, charge and reinstall. They also fit well, so overall I am happy.

Well built product works fantastic and no more searching for that size at little stores.

Works as advertised. Also, it made my old moonbeam flashlight much lighter.

These might be usable for some applications, but they have a flaw that makes them useless for most. These are a plastic shell that you insert an AA battery into. This pushes the adapter's positive contact into position. If the battery is not fully seated, the positive will not reach the device's contact, so will not supply power. There is nothing but friction holding the battery in, so as you put these in the device, one wrong move means the battery slips out of position. Since I need to pull these out frequently to recharge, each time it's a struggle to install all four without at least one not working. So, stars added because they can work, but a couple off because they are so finicky.

10/10 so much better than buying D batteries all the time. Easy to use fit great. Removing is just as easy

単3の充電池で、単1用の器具が使えるので便利です。ちゃんと使えて、しかも安い。ありがたい商品です。

かなり緩めで電池がすぐ抜けてしまう。セロテープ使って固定し、利用しています。

良かったです

単一よりサイズが小さい

単3充電池はたくさんあるけど、単1充電池は持っていない。単1を使う器具が我が家にはひとつしかなく、都度都度アルカリ乾電池を買っていたのだが、昨今の物価高もあり勿体ない気がしてこちらを導入。充電池とのフィッティングも電池の持ちも問題なく、もっと早く買っておけば良かったと後悔している。