I have made more than one power packs using used 18650 batteries. I have tried it with several different sets of batteries and 3 different PCB boards.
I have a 3 different 2S board, and 1 3S board. I have used them with several different batteries. All batteries were originally charged in the PC and then removed from the PC battery or they were individually chrged in a single battery charger. All batteries when tested individually or in series. were good showing more than 4.3V. I thought the maximum they are charged to are 4.3 or so. Some of them read 5.3 (taken from the same PC battery), may be you can explain that too.
Ok. I connected them to the PCB boards. Measured at PCB output: Only one pack shows correct 8.7V (2S). All others I tried are drastically low. A 3S shows only 7.8V, 2 of 3S packs show only 6.7 - 5.8V. I have checked all the connections over and over. I have changed the way they are connected, temporary allegator connections and soldered connections. They all show the same problem
Can you please explain why? and what is the solution? Thank you very much.
I have a 3 different 2S board, and 1 3S board. I have used them with several different batteries. All batteries were originally charged in the PC and then removed from the PC battery or they were individually chrged in a single battery charger. All batteries when tested individually or in series. were good showing more than 4.3V. I thought the maximum they are charged to are 4.3 or so. Some of them read 5.3 (taken from the same PC battery), may be you can explain that too.
Ok. I connected them to the PCB boards. Measured at PCB output: Only one pack shows correct 8.7V (2S). All others I tried are drastically low. A 3S shows only 7.8V, 2 of 3S packs show only 6.7 - 5.8V. I have checked all the connections over and over. I have changed the way they are connected, temporary allegator connections and soldered connections. They all show the same problem
Can you please explain why? and what is the solution? Thank you very much.