Power Tool Batteries 2021 Test: Which Brand Wins?

hour 350 g, 4 amp hour 613 g, 12 amp hour 1,446 g

hour 380 g, 4 amp hour 619 g, 6 amp hour about 679 g

hour 428 g, 4 amp hour 728 g, 12 amp hour 1,548 g, heaviest battery of all three brands tested

with 2 amp hour, 1,625 PSI with 4 amp hour, 1,875 PSI with 12 amp hour; bigger batteries steadily improved performance

with 2 amp hour, 1,950 PSI with 4 amp hour, 2,200 PSI with 6 amp hour, the largest gain of the three brands tested at this tool

with 2 amp hour, described as very impressive though it broke two socket test adapters first; pegged the gauge at about 3,000 PSI in 12 seconds with 4 amp hour; the 12 amp hour battery triggered the tool's overload protection and could not complete the test even after an hour of cooldown and a retry

with 2 amp hour, 2,005 RPM with 4 amp hour, 2,012 RPM with 12 amp hour, rated for 2,000 RPM in top gear

with 2 amp hour, 2,131 RPM with 4 amp hour, 2,165 RPM with 6 amp hour, rated for 2,100 RPM in second gear

with 2 amp hour, 1,814 RPM with 4 amp hour, 1,869 RPM with 12 amp hour

with 2 amp hour, 415 in-lb with 4 amp hour, 617 in-lb with 12 amp hour, nearly double the 2 amp hour result

with 2 amp hour, 516 in-lb with 4 amp hour, 542 in-lb with 6 amp hour

with 2 amp hour, 498 in-lb with 4 amp hour, 608 in-lb with 12 amp hour, more than double the 2 amp hour result

hour struggled at 15.92, 14.95 and 19.92 seconds across three cuts; 4 amp hour was fastest at 8.77, 8.11 and 7.7 seconds; 12 amp hour was slower than the 4 amp hour at 15.36, 16.12 and 14.25 seconds because the blade moved too fast and reduced cutting speed

hour was slow at 18.2, 17.44 and 17.59 seconds; 4 amp hour nearly doubled speed at 7.55, 7.96 and 9.38 seconds; 6 amp hour was fastest and most consistent at 7.4, 7.45 and 7.86 seconds

hour was the best and most consistent of all three brands at this battery size, at 8.31, 8.16 and 8.21 seconds; 4 amp hour was slightly slower despite a faster blade speed, at 8.46, 8.41 and 8.41 seconds; 12 amp hour cut faster overall at 13.07, 12.26 and 11.6 seconds but was still slower than the smaller batteries because the blade over-sped

hour started at 77 mph and dropped to 60 mph by the 5 minute mark; 4 amp hour started at 78 mph and dropped to 71 mph by 5 minutes; 12 amp hour held steady at 78 mph for the full 5 minutes

hour started at 74 mph and shut off entirely at 4 minutes 52 seconds; 4 amp hour started at 78 mph and dropped to 69 mph by 5 minutes; 6 amp hour started at 78 mph and dropped to 73 mph by 5 minutes

hour started at 77 mph and dropped to 68 mph by 5 minutes; 4 amp hour started at 78 mph and dropped to 69 mph by 5 minutes; 12 amp hour held steady at 78 mph for the full 5 minutes