ANVOW Rechargeable AAAA Batteries 4-Pack - 1.2V 400mAh Ni-MH with Storage Case - Compatible with Microsoft Surface Pen & Active Stylus - Perfect for Digital Artists, Note-Taking & Professional Use

I use these batteries in flash lights daily at my job. they last as long time and to be honest the are easy yo recharge. When they run down I put them on the charger when I get home. By the time I am going to bed they are charged up and ready to go for the next days of use. I really dont know how long the batteries will last as I have yet to have to replace them. Great product for the money. I will buy more as needed.I got the arrow brand long ago when I had a surface before it broke. When I got a new surface last year, I came right back to this brand and have remained satisfied. It’s so hard finding this size battery that it’s really helpful to have rechargeable ones.I already had an arrow brand charger but I lost the batteries after my first surface broke years ago. The newer surfaces/chargers have a USB port on the charger that the arrow charger can slip right into. It’s slender and easy to keep in my tablet pocket. I use my pen daily and often, but I have not had to change out the battery yet. Having four is helpful since they’re small. If I ever need to replace them again (either due to life of batteries in general or because I accidentally lost one) I’ll come back to this brand.AAAA (yes, 4-A) batteries are hard to find at any time, these rechargeable AAAA batteries not only reduce waste, they mean never having to be without power for my Surface pen and my Streamline Stylus LED penlight. My Miboxer 18650 charger charges these just fine. Satisfied.Perfect for tablet pensI use a Bluetooth digital pen for taking notes on my Dell PC. The pen tends to eat batteries. Having these rechargeable ones has proven to be a great reusable alternative. I purchased 4 so that when I travel, there would always be a spare. I just recharge over the weekend and then I am prepared for the following work week. Great product and delivered promptlyGreat product! I needed these for my Surface Pro styluses...I never knew this size batteries existed until I saw them here. They charge reasonably fast, and I prefer NiMH batteries compared to alkalines which I have to toss and increase a landfill. Shipping was faster than expected and accurate. This company rocks! Now you just have to get another charger that charges AAAA batteries ?They fit in my pen for laptop .We use these for our flash lights. So far a couple charges and no issues.Batteries visually looked fine when I took them out of the package, no leaks or damage. However after I placed the four batteries into my charger, there was a slight hissing noise with one of them. Immediately removed all batteries from the charger and the one was still hissing! Thankfully I heard the noise right away and didn't leave it plugged in. Not impressed.Works as described, hard to find item anywhere else!Used these batteries for a surface pen. Did not last more than one hour without cutting out or giving problems.superthey work well