Review on ALLOSUN Battery Internal Resistance Meter/Voltage Tester/ Digital Battery Analyzer CECOMINOD062345 by Matthew Miles

Probably the cheapest internal battery ohmmeter on the market but its accuracy is amazing, better than I expected. My top-end iCharger DUO measures the internal resistance of all cells of multi-cell LiPo batteries perfectly, but Li-Ion has a result 10 times higher than normal. Also soldering the #8 caliber leads to the tabs on the battery holder didn't help either. This small pocket device makes it possible - 4-wire lines + 1 kHz measuring pulses are the best solution. The Samsung Li-Ion 18650 25R shows a resistance below 20 mΩ as it should. However, it is not easy to get a stable result to keep the wires in a taut state - the contact area introduces significant additional resistance. I suggest pressing the tips of the electrodes perpendicular to the petals of the lithium ion battery. The only way I think to improve accuracy is to replace the hand electrodes with stationary cable holders in the battery to improve contact. I am considering doing this for 18650 battery testing. (Although the wires are permanently bonded inside the tester to minimize contact resistance). Attention: Only a Chinese manual is included. At my request, all-sun emailed me a manual in English - it's pretty well written.