Review on Tenergy 5-in-1 Battery Meter: Intelligent Cell Meter Digital Battery 🔋 Checker & Balancer for LiPo, LiFePO4, Li-ion, NiCd, NiMH Battery Packs by Brandon Henry

I have at least two other battery volt meters and one that also measures power. But they don't read the internal resistance (IR) of my LiPo batteries. This is true and I think it is very important to understand the condition of your LiPo battery and determine when it should be taken out of service. This meter provides this measurement for each cell. However, there are no instructions for the gauge and I had to turn to YouTube to find out how to use it - I would advise checking one of these out before you buy. There are other features on this gauge, and I'll have to do some research to see how to use those other features. A simple link to some instructions would be very helpful. If you don't know how IR affects usage, just add up the IR for each cell (they're shown in milliohms) and multiply by the current you expect to run. This will tell you how much voltage you are dropping across the battery. Take the square of the current times the total number of IRs and that's what your battery loses as heat due to the IR. If the total IR for LiPo averages over 10mΩ per cell, it's probably time to retire. Note. You will see that most of the degradation occurs in the first and last cells. This is a good product but some usage info would be VERY helpful.