Show pageOld revisionsBacklinksAdd to bookExport to PDFBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== cells ====== ===== internal resistance ===== All you need is a 4 ohm 5W power resistor or similar and a multimeter. * First, measure the battery's voltage when charged. This is V1 * Next, connect your multimeter leads to each side of the resistor and briefly connect the resistor across the battery. Note the voltage reading, this is V2. * Measure your resistor to get its precise resistance, this is R The battery's internal resistance (Ri) is calculated with the formula: Ri = (V1-V2)*R/V2 18650 Ri values: * 75-150 mOhm - Excellent * 150-250 mOhm - Good * 250-350 mOhm - Marginal * 350-Up mOhm - Bad projects/zibaldone/electronic/cells.txt Last modified: 2021/10/10 09:37by scipio