Biswaye 2Pack 6.0Ah 20V Battery Replacement for Dewalt 20V MAX
Tier Sby Biswaye
Test published July 2026
A diamond-in-the-rough 3rd-party battery that deserves as much attention as Waitley for being well-built. Uses a 45A tabless 18650 cell that is even better than DeWalt's Samsung cells, has an engineered safety fuse, and outperforms other batteries on my tests.
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Delivers ~98% of a true 6 Ah. Refreshingly honest advertising.
Survived 20 power cycles, and electrical construction is great.
5.85 Ah capacity.
Highest power output of a standard 5S2P 18650 pack yet. Standout performance.
Second pack ever tested to have a functional engineered safety fuse that activated before cells vented / failed catastrophically
Testing Statistics
Cell notes
EVE Energy INR18650/30PL, rated 45 A max continuous discharge, 3000 mAh capacity. Packs I tested had a fresh December 2025 date code.
Cycling Test
We cycle the batteries at high-power (800W for 20s on, then 20W for 6s off) to reflect their actual usage in high-load scenarios like circular saw use.
Capacity Test
We measure the amount of usable energy the pack supplies from 100% to 0% charge.
Pack Internal Resistance Test
Failure Test
The battery is stepped through 30s at increasing current levels, ignoring safety features like temperature and voltage warnings, until the pack fails catastrophically.
Teardown Photos
