EEMB Rechargeable D Batteries 1.5V Lithium D Cell Battery USB-C Charging Cable LR20 Replacement Li-ion Battery 5550mWh for Flashlight 2 Pack

I had never seen anything like this before so I decided to give it a try, and it works well for what I'm using it for (handheld pump for cleaning an aquarium- low energy consumption). Batteries seem to hold their charge pretty well and I haven't had to recharge them yet (I only use the pump 1X per week). Anyway, I find these batteries useful and convenient, so I would recommend them.

I really like these batteries they are already starting to pay for theirselves. They work well. Just charge them when needed. Charge time is short and fast.

Very lightweight. Seems to take longer than assumed to charge

Works good

Excellent product. Just as it was described.

Trabajando perfecto

I tried charging these batteries would not charge made my smart usb charger turn off. I noticed the batteries got warm took them off charger put them in my automatic light didn’t hold any charge. I threw them away. The charging light on top of them won’t even light up when put to charge like they use to.

They don't have much longevity. An off the shelf alkaline lasts longer.