Hi all.
I have 14 years old impact gun Ingersoll Rand - absolutely brilliant and powerfull - and batteries are dead obviosuly. Seen some YT videos and decided go for it. I have many 18650 batteries kicking around and easiest way would be connect 5 in series, 5S BMS on top - job done... But! Can I put in another slot of 5 in series, (plenty space inside housing) another 5S BMS on top and connect both units paralel? Is it good idea, or is out there somwhere better way?