Bosch PS31 vs Milwaukee M12 2410-20 3/8 in 10mm cordless drill test

I recently got a hold of new and improved Bosch subcompact 3/8″ drill model PS31. Unlike PS30, it comes with new BAT412 batteries which are based on Samsung SDI 13Q cells (same cells as Milwaukee uses in their M12 line), smaller body and more torque. The following picture is PS31 (left) with PS30 comparison.

PS31 specs are:

  • Battery/Charger: 30-Minute Charger
  • Chuck Size: Single Sleeve 3/8″ Chuck
  • Length: 7″
  • No Load RPM: 0-350 / 0-1,300
  • Torque (in. lbs.): 265
  • Voltage: 12V
  • Weight (lbs.): 2.14 lbs.

I measured the weight at 785 g bare tool, 953 g with battery. Milwaukee is 1013 g bare tool, 1191 grams with battery. Milwaukee weighs more because of all-metal chuck, unlike plastic sleeve chuck in Ps30/31 and all-metal gearbox. Originally Milwaukee used eOne Moli Energy IMR18650 cells for their M12 line but tests (on RC forums) show that despite high discharge currents, Moli cells have a very limited lifespan (20% capacity loss after 300 cycles) so I assume they switched to Samsung for that reason. Bosch originally (in BAT411) used Sony US18650VT cells which provide less current than Samsung 13Q. Both drills have battery gauge built into the tool, 3-LED in Bosch and 4-LED in Milwaukee. Now that we have identical batteries, it would be interesting to test these tools. I drilled a “2×6″ pine board with a 3/8” forstner bit as a test.

Milwaukee M12 specs:

  • 2-Speed (0-1,500/0-400) All Metal Gear Box–Up to 35% faster drilling / fastening and Milwaukee durability
  • Powerful Motor: Delivers 250 in/lbs of torque– Up to 25% More Torque
  • 3/8 Single Sleeve ratcheting metal chuck–Increased bit retention and durability
  • Lightweight and Compact–Tool belt portable at only 2.5lbs and 7-3/8
  • Integrated LED and Fuel Gauge– Increased productivity and decreased frustration.

Bosch averaged 108 holes in 3-1/2 pine with 3/8 bit, Milwaukee averaged 132 holes. Looks like Milwaukee has a better gearbox and more efficient motor. Also I noticed Bosch doesn’t balance their battery cells with their chargers, while Bosch has taps between the cells that allow to individually charge each of 3 cells, prolonging the battery life.

Ok, now some videos:

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