LV5
A no-name e-bike's 48V Li-ion pack only goes one or two km: case not small but hollow inside, 18650 3P13S low-capacity cells, tester says 'battery condition extremely poor', not worth repairing; all replaced with EVE 2.5Ah in 4P13S = 48V 10Ah, honest capacity with no inflation, 30-odd km on an ordinary small bike; nickel-strip spot welding, BMS fitted, charge/discharge test
A 48V Li-ion battery; the customer says it only goes one or two km. No need to check the capacity: pick it up and you can tell the case isn't small but the cell capacity certainly is; no-name e-bikes off the internet all come with this kind; open it up and one section inside is empty; 18650 cells in 3P13S, ordinary low-capacity cells that won't last long even with light home use; test cell by cell with the resistance tester: readings 3.5–3.6V, resistance 16–24, screen says 'battery condition extremely poor, please service', no repair value at all. Replace everything: EVE 2.5 cells in 4P13S = 48V 10Ah, honest capacity with no inflation, an ordinary small bike will do 30-odd km no problem; spot-weld the cells in parallel and series with nickel strip; fit the BMS, charge/discharge test, battery done. 25 comments: many asking price (48V 10A / 30A / 5P13S, how much); 21700 5000mAh in 4P makes 48V 20Ah; lots of fake EVE cells, ¥2-odd each, zero volts after three months in storage; BAK 2900 without holders in 6P rides 60 km; a designated-driver bike's 48V 8Ah drops out as soon as the throttle turns, fixable?; Wuyang buyers got scammed with fake capacity.
48V Li-ion battery cell-replacement repairProjectsBattery Master Zhang