2PCS 18650 Rechargeable Battery 3.7 Volt Lithium 9900mAh Large Capacity Flat Top for Flashlights Headlamps

First of all, the seller was great at responding back as soon as they could. Sometimes it was tricky due to time differences but regardless seller still answered every inquiry. My package got lost in the mail and the seller immediately offered a refund or re-shipment of the product. Seller was also kind enough to throw in some extra batteries for the inconvenience.Product works great! Haven’t had any issues at all, the batteries are great quality. Battery life is excellent and lasts forever! Will definitely be repurchasing in the future. Price point is pretty good too compared to other places I have purchased similar batteries at.

Excellent product. still using them today

I have used these batteries for a year. The capacity is ok, their durability is good for all except one. The battery capacity is decent and it takes around 35 minutes to charge full.The 18650 battery cases will take these batteries and they fit snug.

Short story: the capacity is around 10% of advertised.Longer story:I ordered these on prime day, paid 20% more than what they were selling for by the time they arrived. Looked for something with decent reviews and competitive specs without knowing a lot about them.These batteries arrived and felt lighter than my old ones. I weighed them on a kitchen scale at 35 grams per cell, while my old ones are 46 grams. So I did a little research and it turns out current 18650 lithium ion cells top out around 3400-3600 mAh or so, for the most expensive name brands. These ones claim to be 9900 mAh.So I tested them. Two of these in parallel ran a 1 amp desk fan for 2 hours and 8 minutes. That's 1067 mAh, or 10.77% of the claimed capacity. Those are crude, overly generous numbers; the fan pulls 1 amp when the battery is fresh but the current decreases as the voltage runs down. Realistically probably 800-900 mAh. You can find videos of people pulling batteries just like these ones apart and they're really a much smaller cell packed into a larger case with straight up fraudulent claims on the outer label.If they actually had over 1 watt hour per gram of specific energy brought to mass market, they could shatter the entire energy sector and electric vehicles would drive a thousand miles between charges.

My hope was to replace a bad battery in a Dewalt battery pack. But when I opened it up, I discovered battery was welded in place, and would have to break plastic housing. The batteries supplied by the vendor came almost next day in a very secure package, and were completely charged, and ready to go.

This works so much better than what came in my flashlight. Will definitely be purchasing again if the need arises.

Same number as the batter in my product but found out the battery in my product is proprietary.

Use regularly. Holding up well.