recog 1 Posted February 23 Report Share Posted February 23 Hiya! I'm trying to built my battery pack. I had used LG HG2 3000 mah batteries which has 30A peak discharge. The problem is DCF880 drill doesn't want to turn. When the switch triggered LED goes on/off but the motor is not turning. DCF880 is fine because it works with the original battery. Quote Link to post Share on other sites
recog 1 Posted February 23 Author Report Share Posted February 23 I thought it is chinese BMS not capable and bypassed it by adding original dewalt PCB. The original PCB also has NTC sensor on it. I measured the voltages all fine. 20.60V at the drill.Again, LED goes on/off but the motor is not turning. What does the tool wants to know? Or whats could be the problem? Quote Link to post Share on other sites
Eric - TIA 1,223 Posted February 23 Report Share Posted February 23 Above what I know, but that is awesome you are able to do that. Very cool. Quote Link to post Share on other sites
recog 1 Posted February 24 Author Report Share Posted February 24 Cool but doesn't work 🤣 I think the tool needs more signal Quote Link to post Share on other sites
recog 1 Posted February 26 Author Report Share Posted February 26 Okay just found it. The tool needs C1 & C3 as an input. C1=4.2V C3=12.6V Now I'm modeling and printing the case for it. It would be uploaded to thingiverse.com for the ones looking to make their batteries. 1 Quote Link to post Share on other sites
RDC 4 Posted February 26 Report Share Posted February 26 I haven't dug into a pile of the tools, but it most likely depends on the tool. The DCD780 needs the B+ and B-, but then it also needs C3 and TH to work correctly. If it gets no voltage from TH (the Thermistor in the pack) it throttles the drill back as it 'thinks' the pack is overheating. 1 Quote Link to post Share on other sites
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