3.2V 50Ah LiFePO4 Cells Lithium Battery Iron Phosphate Deep Cycle Battery, Power Supply for RV, Boat, Golf Cart, Motor, UPS, Fish Finder, Lawn Mower, Off Grid, Solar Systems, etc.

I bought these before they had any ratings, which I don't normally do, but thought I'd take the chance based on price per amp hour....I'm running these in 4S with the included buss bars to power a DC motor that runs my rock tumbler. I'm also using a voltage controller to control the voltage going to the motor thereby adjusting the RPM's of the tumbler.This battery setup will run my tumbler for about 9 days or very close to 216 hours, which leaves the battery pack at about 11.2V - while 10V would be considered fully drained. From 11.2V my charger shows just a little over 51Ah pack capacity!Been using this battery pack for this purpose for about 4months continuously now, and have no issues. Even without a BMS, the batteries keep within 0.02V of each other throughout the discharge cycle.I now finally have a BMS, solar panel & solar charge controller to finally put this whole project together. And hope that this will continue to power my rock tumbler for years to come.

Those batteries are completely great. And not expensive.It's my first time, I'm happy like that with an item.I recommend it to everyone.Thank you!

Out of the box, two of the four cells are bulging.