Faulty Makita Battery diagnosis

In this video I attempt to find the fault in a Makita 6AH 18v LXT lithium ion battery. I first of all show the details of the fault which is a single flashing battery light and the battery refuses to charge or power any tools. The model of battery featured is BL1860D. The details shown in this video will be the same for any 18v LXT Makita battery other models include BL1830,BL1840 and BL1850. I try to establish the root of the problem and attempt possible repairs. I test the voltage that the battery is producing in this case it was roughly 14v. Batteries at low voltage like this cannot power the 18v tools or indeed take a charge. Sometimes the low ered voltage would suggest a bad cell or 2 but that was not the case this time. I then proceeded to open the battery testing the individual cells discovering they had all lower voltage than they should so this led me to think the cells were all viable and cell replacement was not required. I then tried the sometimes effective measure which is nicknamed the jumpstart method this method involves connecting a good battery to the bad and transferring power to the bad one raising the voltage to a rechargeable level. I was able to bring the bad battery up to over 17v which I would consider the zone for rechargeability however it did not work this time as the PCB board in the battery is faulty flashing a single red light. A faulty PCB board stops the battery from receiving charge from the charger and even if you bring it up another way like I did it also stops it from powering tools this is a safety function of the battery technology.
I have ordered a new PCB circuit board for the battery and will carry our the full board replacement on the Makita battery in the near future. This will feature probably next month on my channel. The question is can you repair a makita battery that is not charging? My answer is a resounding yes.
If I can you can. A word of warning however the repair of lithium ion batteries must be approached with caution. Lithium cells can explode and catch fire if punctured, they are most dangerous fully charged. Please be careful if attempting any of the battery repairs on my channel.
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