emr42814 Posted January 11, 2019 Report Share Posted January 11, 2019 Hello I’m new to this forum. I have a question regarding my BL1840B 18V li-ion battery. So this model battery has the star protection feature and so does my XDT11R Impact. I Noticed when I press the charge level indicator button on the battery itself to read how much juice is left so I can charge it and instead of showing me the charge level, it illuminates 2 bars on the left and 2 bars on the right flashing in pairs left to right. When I plugged it into my impact drill, only the LED lights turn on when I press on the trigger. So I tried plugging it in to the charger and it wount accept it. Can Anyone Explain why my battery is acting weird illuminating left to right ??(Again Not The Charger. Battery has its own charge level indicator light on the battery itself) Idk what the hell is wrong with this battery, Thanks in advance. I just don’t want to throw away a 200$ battery if it can be fixed Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
ToolBane Posted January 11, 2019 Report Share Posted January 11, 2019 Battery is FUBAR. Contact Makita customer service. 1 Quote Link to comment Share on other sites More sharing options...
PNWtooljunkie Posted January 13, 2019 Report Share Posted January 13, 2019 Yup, battery had malfunctioned. Here’s a shot from the owners manual Quote Link to comment Share on other sites More sharing options...
MaKetil Posted May 22, 2021 Report Share Posted May 22, 2021 Hi emr, Did You get repair help? I have a battery w similar blinking, 5A. Opened the case and checked voltage, all good. Hence, pcb is gone. Where can I buy a replacement pcb fit to 1850b 5A , anyone? Thanx! MaKetil Quote Link to comment Share on other sites More sharing options...
mikkowus Posted December 11, 2023 Report Share Posted December 11, 2023 Has anyone come up with a fix for this issue? I haven't gotten ahold of customer support Quote Link to comment Share on other sites More sharing options...
glen608 Posted December 11, 2023 Report Share Posted December 11, 2023 i have over 20 18v batteries some 3ah some 5 ah all over 24 months old. i bought 4 new 6ah batteries less than a year ago and 2 of these have started to double flash. is there a fault on them ? Quote Link to comment Share on other sites More sharing options...
Pino77 Posted December 12, 2023 Report Share Posted December 12, 2023 My BL1850B battery has been at the bottom of the harbor for a few hours. I used a magnet to retrieve the DDF484 drill from underwater. I let the battery drain and opened it up. All the water is now out, but the lights are also alternating in pairs. I opened the battery. The voltage across the cells is 19 volts. The cells seem to be fine. Is it possible to reset the circuit board? (By the way, the DDF484 works again after disassembly and cleaning.) Quote Link to comment Share on other sites More sharing options...
mikkowus Posted December 14, 2023 Report Share Posted December 14, 2023 I opened up one of my batteries that had the double flash and every battery was showing 4.12 v. And for an instant, it will show 19v from the terminals then drop to 1v. or nothing. Has anyone come up with a fix for this? Maybe I could somehow drain the batteries and that would reset things? Quote Link to comment Share on other sites More sharing options...
moggy007 Posted January 11 Report Share Posted January 11 Hey I have the same issue with my 6ah makita battery. Its hardly been used, but has double red lights flashing each side of the battery indicator when pressed. Voltage is good on the multi meter, reads 20.4v but won't charge in the makita charger. Has anyone come up with a fix for this issue? They were quite expensive at £90 a battery, so hoping I'll be able to save it. Thanks Quote Link to comment Share on other sites More sharing options...
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