Deleepow Rechargeable AA Lithium Batteries 1.5V 3400mWh - 4 Pack with 1500 Cycles | Long Lasting Power for Cameras, Flashlights, Toys & Electronics | USB-C Rechargeable AA Batteries

... so far so good. Already charged the two I bought 5 times each, so already got my money's worth versus buying and throwing away 10 good alkalines. Actually, paid off after 4 charges.CONS- The charging light on one does not change from red to green after charging, but if I unplug it and plug it back into the SUPER convenient supplied cable, it turns from red to green in a minute or so. Charged but needs a little help. I use them in musical gear and have noticed they last about 6 hours vs the 4 hours I was getting from the expensive silver and black and copper top batteries.The biggest waste of money is on AA/AAA batteries! Even NiMH are a waste of money. They produce less power and don't contain as much energy as alkaline. Then comes lithium rechargable batteries and "BAM!". More power, consistent 1.5V, fast charging, and more cycles than any other type of rechargeable battery!Ths charger works only with the batterys that come with it. I will not charge anotherbrand.Only works well with there brand of batteries, other wise always says ERROR.I finally solved the issue that godox triggers have with rechargeable batteries that never shows full battery on the trigger's battery meter that is because the trigger is designed to work with 1.5v AA batteries and most rechargeable batteries are 1.2v.This batteries work fine, i have noticed that on the last bar on the bat meter after a while it doesnt reach the empty status and suddenly die but they last long.I bought these because I absolutely love the idea of USB-rechargeable batteries. However, I have noticed that these will not charge up past 8.4 volts at the maximum. The power runs down much more quickly than a regular alkaline battery, too. I'm sure they're just fine for things like remote control, or another low drain device. I use them in guitar pedals. You can get some pretty fun results with fuzz pedals, but they would drain too quickly for any other type of effect.I was getting tired of purchasing 9-volt batteries as they are quite expensive these days. This is just the ticket. I can use it in my devices and when run down I can recharge it for future use. I collect vintage transistor radios, and this will be used to power many of them when I want to use one. Best of all is they will not leak and destroy my collectable radios.It comes with the battery sealed in separate plastic case. Included is a power cord for recharging. It does not include the wall plug so I just plug it into the computer USB port or one of the many wall chargers that we have around the house. The cable's input end is not the modern USB-C type. It is the older mini-USB. But it works well. Upon arrival the battery was completely dead. Charge time was about 3.5 hours. While charging it has a bright red glow from within and once full that red turns to green.It adds power to my appliances and its power lasts twice as long as the 1.2V 2000mWh. But it is new to me. I don't know how many charges I am able to have from this battery.