Sinyeeho 18650 Rechargeable Battery Charger Set, 3.7V Button Top Lithium ion Rechargeable Battery for Flashlight Headlamp (4Batteries+ Battery Charger

I’m using these rechargeable batteries with my head lamp. The charger is compact and simple to use and with the USB plug, I can charge using my laptop or wall outlet. The charger also adjusts to fit rechargeable batteries of other sizes. The batteries have a long charge life with a reasonable charging time. Great value, performance, and quality for the money. I would definitely recommend these batteries.

Works perfectly. Like how the charger can adjust to different sizes

The Batteries are fine, they charge and last adequately. The Charger worked great for a year, then the tension spring on one side broke. I can still charge one at a time normally. I am able to use the broken spring slot if I wedge something behind it to keep pressure on the battery. Charger should be more durable.

I’ve had a set of these for a couple months now, they’ve been very good and reliable in multiple devices including flashlights, radios, ect. I haven’t tested the capacity but based on my use cases they seem to be fairly accurate to what’s advertised. They also charge quickly and fit well in all my devices that require this style of 18650.

Haven't used the charger yet... I might in the future. Bought these after purchasing a new head lamp at menards that uses 2 swappable 18650 button tops. I used a battery tester that fully charges the battery then discharges them at a selected rate (i used 1000mah) and then fully charges them again. I performed the test twice. The ones that came with headlamp were rated at 1200mah and tested at 1150ish each... these being rated at 3400 tested at approx 2900mah each. I wasn't surprised and am happy with it. Giving me much longer use time obviously. I like the battery holder... it's very convenient and seems solid. I can now keep my 1000lm headlamp running all work day. Hope this helps.

I am very impressed with the batteries and charger. The batteries have way more power than the ones I replaced. The charger works very well and is built sturdy so I don't think I will be needing to buy another one anytime soon. Solid product.

The charger and batteries did everything I expected them to do. The charging process went from red to green just as advertised in a reasonable amount of time. The batteries fit the flash lite just like I wanted them to. The packing and holding case were solid and very professionally done. What makes most products disappointing is the negative things, cheap and junky, this product has none of that. Although I did not verify it, I expect that the 3400mah "spec" is meet base the feel, appearance, and performance. Overall, a good solid product.

Who knows if these are as-rated? The charger is kind of messed up, and the light stays red even when the batteries are charged. After being on the charger for hours one side was still red and the other was sort of green and kept going back to red, I put them on another charger and they were charged, so I know it worked, but I don't know if it had kicked off or if it would have cooked the battery if I had not removed them. The batteries did come in a nice case and seem to work well in a couple of flashlights, so I will conditionally recommend them.