Two models side by side: measurements taken by the author in their reviews, and their conclusions. The better value in each row is highlighted.
In brief: Based on review measurements: Capacity: BL1860 (5933 mAh vs. 3670); Energy: BL1860 (109 Wh vs. 65); Test current: BL1860 (20 A vs. 10); Resistance: M18 battery (15 mΩ vs. 30).
Only in one review: Voltage 18 V (M18 battery); Temperature rise 77 °C (BL1860); Weight 655 g (M18 battery).
M18 battery: The case and protection are decent, but capacity is about 4 Ah instead of the claimed 6 Ah; the author advises against buying it.
BL1860: The Samsung 30Q-cell pack delivered its claimed capacity and pleased the author more than the previous one.
Figures were taken from the review text and checked against the quoted passages. Measurement conditions differ between reviews, so read the reviews yourself before buying. Prices at the time of review.
M18 batteryMilwaukee · 2021Read review →
BL1860Makita · 2023Read review →