Synergy Digital Power Tool Battery, Compatible with Festool BPS15.6 Power Tool, (Ni-MH, 15.6V, 2100mAh) Ultra High Capacity, Replacement for Festool 491 823, 492 269, 6S, BPS15, BPS15.6 Battery - Walmart.com
BPS15.6V Festool NiCad Battery Rebuild Service – MTO Battery
Battery holder for Festool batteries by Brian K | Download free STL model | Printables.com