1.5 Volts C Batteries

Weird to have a batteries charge like this but they work

I've been using these 10440 batteries from Camelcell for years now and they have a great charging retention. I charge them in my lesser used flashlights and they sometimes go for months without being topped off and I can always rely on them to work when the need arises. I suggest recharging every 3 months or so to keep the batteries healthy and happy. The inclusion of the USB-C charging port means you don't have to buy expensive LiOn battery chargers and bonus, they include a 4 port charging cable that allows you to charge multiple batteries simultaneously. Highly Recommended!

I found a 4 D cell battery flashlight in the garage. The batteries were dead, but it was nice and clean. Decided to upgrade it, switched it to Lithium rechargeables and replaced the old incandescent bulb with a LED. Works great, nice and bright, lighter too... Batteries can recharge in about 2 hours. It was nice to repurpose an old flashlight and bring it into the 21 century...

Purchased these 10440 rechargeable lithium batteries and overall, they’re well-made and perform reliably in smaller electronics like flashlights. The price is very reasonable, and the power output is solid for their size. However, one important compatibility issue is worth mentioning: these particular 10440 batteries have flat tops instead of raised positive terminals. Many devices—such as my exercise machine—require a raised terminal to complete the connection. Because of this, the batteries didn’t register in the machine at all, even though they worked fine elsewhere. If your device needs raised terminals for proper contact, you may run into the same issue. Otherwise, they’re a good value and perform well in compatible electronics but otherwise, they’re a great value.

I made the mistake of trying to save a couple dollars from the brand I normally buy on Amazon and what I got was a horrible experience with these batteries that do not properly accept the USB type c plug because the port is not aligned with the battery casing, as you can see in the photo and in my video. You're going to scrape up and crush and ruin your USB type-c plugs trying to get them in, and worse you're going to short out the batteries. But that may not matter a lot because almost half of them, three out of eight, we're bad right out of the box with fast flashing green lights indicating trouble. Not that there were any instructions to tell me what that meant so I had to go digging on the net. It means a problem. Very poor manufacturing quality can't even align a case and a port and now I'm supposed to trust this in my home with my children not to create a problem? No, I'm not keeping these and they're going straight back to Amazon for a refund. I'm going to go back and order the more expensive ones which end up being much cheaper in the long run because they all work, all the time, and I would encourage you to buy a different brand than this one. In case any of the above is unclear, I absolutely DO NOT RECOMMEND these poorly made and possibly dangerous batteries.

With rechargeable D batteries is always a challenge. Always make sure they hold plenty of energy. I use these for and outdoor motion sensing light and they are perfect. The fact that you can connect them to a USB cable instead of a charger is a sweet addition.

Great as described

I purchased these USB-C rechargeable batteries for a battery-powered pet door, which requires four new batteries every 1–2 months. After extensive research, I chose this option, hoping for longer-lasting performance and a break from constantly buying D-cell batteries. My goal was to save money in the long run while reducing environmental waste from disposable batteries. After more than six months of use, I've found myself needing to disassemble the door more frequently to recharge these batteries compared to when I used disposables. They seem to provide less power to the door’s motor and electronics, leading to more interruptions. Because of this, I’ve decided to return to disposable batteries for this application and will not be purchasing more rechargeable batteries for similar uses. I truly wish the technology were more comparable—or better—so that USB-C rechargeable batteries could offer longer usage between charges than traditional single-use batteries.