maybe it can be recharged? Batteries purchased at Yahoo Auctions and Mercari with faint expectations.
This time, I will repair the Makita BL1860B that keeps flashing red and does not start charging.

Battery modification playlist
   • マキタバッテリーの充電不良品を復活できるかな安定化電源で充電して修理する...  

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※Notes
Battery disassembly and cell replacement involve risks such as fire.
If you modify it, please do so at your own risk.
It is safest to use genuine batteries and compatible chargers.

Music used:
Free BGM/music material MusMus http://musmus.main.jp/
Sweet Tea Music Studio https://amachamusic.chagasi.com/
FREE BGM DOVASYNDROME https://dovas.jp/
NoCopyrightSounds    / nocopyrightsounds  

0:00 opening
1:26 1st disassembly
3:26 Repair
4:59 Operation check
5:41 2nd disassembly
6:30 Repair 2
8:42 Operation check 2
9:33 ending