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I have the same problem with this type of vacum. I have tried a lot of things but the problem is with the software included in a 20 pins chip on the pcb so it can not be repaired. But, if you look in the back of the vacum there is a rubber stopper wich hides 2 pins. Maybe those pins can be used to reset the vacums pcb. I really dont know because in can't test it any more. I solved my vacum bypassing the vacum mainboard (pcb). Now my internal battery is directly connected to the 2 motors using a simple switch to powering on and off. The original pcb is conected only to the batery, recharghing wires and led wires so i can recharge the batery as usual. Sorry for my english, hope you understanded what i was trying to explain. good luck
Sounds like you bought a defective battery You can test for this by removing the battery
and holding the power button for 15 seconds. This will restart the
charging cycle as if the battery were new. If it still goes red get a refund and a new one.
Do you have the charger terminal, or do you have the charger that you have to take out the battery and charge. Because I have found that my base terminal charger works better than the battery charger that needs the battery to be removed to charge.If you have the terminal charger and the power light is green when it is in the charger I would start from the terminal