Arik Posted August 9, 2019 Share Posted August 9, 2019 one of my ninebot A1 battery suddenly shows this mistake like the picture shows. i have open it ,but every cell voltage seems the same. who know how to solve it . thanks. Quote Link to comment Share on other sites More sharing options...
Arik Posted August 9, 2019 Author Share Posted August 9, 2019 i have open it Quote Link to comment Share on other sites More sharing options...
atdlzpae Posted August 9, 2019 Share Posted August 9, 2019 (edited) Do you know how to solder? Do you have any experience with electronics? Keywords to google: BMS, 18650 Check the output voltage of the battery under load. It's possible that the cells are fine, but the BMS is broken. Edited August 9, 2019 by atdlzpae Quote Link to comment Share on other sites More sharing options...
Arik Posted August 9, 2019 Author Share Posted August 9, 2019 16 minutes ago, atdlzpae said: Do you know how to solder? Do you have any experience with electronics? Keywords to google: BMS, 18650 Check the output voltage of the battery under load. It's possible that the cells are fine, but the BMS is broken. yes i have electric soldering iron and i know how to check every 18650cell,every 18650 is fine . i think something wrong with BMS, but i do not know how to repair the BMS. i push the resert button,the light is keep on green now. Quote Link to comment Share on other sites More sharing options...
atdlzpae Posted August 9, 2019 Share Posted August 9, 2019 (edited) Check the voltage under load. Connect a few amps of load and check what voltage the battery gives. Edited August 9, 2019 by atdlzpae Quote Link to comment Share on other sites More sharing options...
evil696 Posted August 9, 2019 Share Posted August 9, 2019 Hi Arik I dont repair 9bot A1 so i'm not 100% sure but try to measure voltage on output battery 1 and battery 2 then measure all single cells and write results, next thing is to check cables from battery to ballancer port, as you propably saw this bms have 15 resistors signed 102 its 1000ohm resistors for ballancing between cells so differentials is porpably caused by different usage of single cells if voltage on all cells will be mostly the same you need to chceck on load but be careful its quite dangerous. There is some options to repair your wheel. First and i think the best is to use NINETOOL software to skip check bms logical connection and then use any bms (any but something in good quality, think that you will be riding on that wheel and you dont want to fall down because of bms), next option is to repair bms but its not so easy without schematic. Quote Link to comment Share on other sites More sharing options...
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