3.7 Volt 14500 Rechargeable Battery and Charger 2500mAh Battery 4Pcs Large Capacity Batteries for LED Flashlight, Headlamps, Cameras, Toys, etc

I bought this for a flashlight that I was powering with a standard AA battery although the light was rated for the higher voltage provided by these batteries. The difference in the performance of the light was incredible. I bought the batteries and charger for economical reasons and both performed well. The batteries don't last long on a charge but as i only need one at a time and I have 2 freshly charged at all times it worked out well for my situation.

This replaces the battery in my Oral-B iO toothbrush. The original battery weighs 18 g, has a capacity of 800 mah, and is dead after three years. These four batteries weigh 14.6, 14.7, 15.8, and 16.4 g. The inconsistency is incredible. Are they handmade? One charge lasts about a week, a little shorter than the original. They are definitely not 2500 mah each, but maybe all four batteries together are.

I purchased this set specifically for a preferred flashlight. It gets used quite often and having fully charged batteries on hand means uninterrupted use. I have another set for other devices and it continues to serve me well. This set is economical and versatile. The batteries fit perfectly and provide sufficient power for a brighter beam.

In testing these batteries in real life application, They produce the Voltage of 3.7. However, Based on the time to charge with a 1 Watt Solar panel and looking at discharge, these are not 2500mAh capacity batteries. Again, they work. But, not the capacity that I was expecting.

I tried these and was sorely disappointed. But I thought I needed to give them a bit of exercise and used them and recharged them about 3 times. After the third time I tested them in my chargers test cycle and you can see the results.... barely 300 mAh. These are going back.

These work fine. They charged up quickly and I use them in some smaller flashlights and outside garden lights with 14500 batteries.

In this four pack of batteries one is dead, one holds a good charge, and the other two are somewhere in-between. All four have only been used in the same led flashlight and have uneven battery life.

They are the same size.They get a little warmer in my flashlight, but it takes 4 AA's.So instead of 6 volts I am putting 14.8 into it.To bad someone doesn't come out with a filler battery.Definitely worth the money.