Hey people!

I'm not that smart, so need some help.

I would like to turn my cordless power tool to corded one, Makita 14.4V. Battery itself has Protection Board, it communicates with the tool to ensure safety for both: battery and the tool.
All things I took in account: power supply needed, right amperage, right wire gauge etc. And I could easily bypass PCM and hook up power supply. But I would like to retain protection futures. And this is where my knowledge ends...



As you can see from the picture logic is simple: middle slot form battery is kind of switch. If it sends +14.4V - tool works, if no power coming out - no buzzi buzzi. Positive and negative terminals from battery are connected directly to slots as in picture above.



That's how batteries are connected in series. Simply thinking I would connect power supply instead of batteries, but as you can see, in the middle of the chain there is one more wire that goes to the PCM, so I would need to imitate that signal and "cheat" protection board. But how do I do that? My bet is that protection boards checks voltages of battery pairs. Anybody knows how could I imitate that signal? Is that possible at all?



I hope my question makes a bit of sense.

Cheers,
Andrius

 

Just put the 14V across the motor terminals, the centre battery wire is for charge balancing.

 

Just put the 14V across the motor terminals, the centre battery wire is for charge balancing.

Thanks!
Unfortunately that's not a choice for me.. Sometimes I do pretty heavy work, so I would like to preserve protection from overload and overheat, as I know, in case of overload or heat, tool sends signal to the PCM board and battery cuts power.

If this 14.4V would work, then I would like to do the same with my 18V, and I do have pretty expensive Makita tools, I would not trust just direct power supply connection..