The Makita 18V pinout are one of those topics that comes up frequently in discussions but the information about it is widely scattered. The basic pins for the 18V packs include a minus pin, plus pin, a TH pin for temperature monitoring and a C1 pin located at the junction between the battery cell group for balancing. Additionally, the Makita tool utilizes pins 1-7 to identify the battery pack. I'm not exactly sure what goes into each of these pins but I would imagine that's what allows for the recognition of the higher capacity vs. The lower capacity battery packs.
For those that are looking to rebuild or utilize the battery packs outside of a Makita tool, knowing what each pin do is essential. From what I've found in my research, the information on most sites about the 18V packs includes the +, -, TH, C1 pins and pins 1-7, but does not offer an explanation of what each of the 7 identification pins does individualy.
For those that are looking to rebuild or utilize the battery packs outside of a Makita tool, knowing what each pin do is essential. From what I've found in my research, the information on most sites about the 18V packs includes the +, -, TH, C1 pins and pins 1-7, but does not offer an explanation of what each of the 7 identification pins does individualy.