# Biswaye 2Pack 6.0Ah 20V Battery Replacement for Dewalt 20V MAX

- Manufacturer: Biswaye
- Tier: S
- Price: $20.00
- Stated capacity: 6 Ah
- Amazon listing: https://www.amazon.com/dp/B0GCN5PN62?tag=lithiumsteppe-20
- Battery page: https://www.lithiumsteppe.com/battery/biswaye_6ah

## Summary

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.

## Ratings

- **Honesty**: 4.6/5 — Delivers ~98% of a true 6 Ah. Refreshingly honest advertising.
- **Durability**: 5/5 (teardown 5/5, cycling 5/5) — Survived 20 power cycles, and electrical construction is great.
  - Teardown notes: Best-in-class internal pack construction for DeWalt-compatible 20V packs
- **Capacity**: 5/5 — 5.85 Ah capacity.
- **Power**: 5/5 — Highest power output of a standard 5S2P 18650 pack yet. Standout performance.
- **Safety**: 5/5 — Second pack ever tested to have a functional engineered safety fuse that activated before cells vented / failed catastrophically

Scoring rules: https://www.lithiumsteppe.com/methodology

## Testing statistics

- Stated capacity: 6 Ah (108 Wh @ 18 V)
- Measured capacity: 5.9 Ah (106.1 Wh @ 18 V)
- Pack internal resistance: 36.1 mOhm
- High-power cycles survived: 20
- Peak sustained power: 1539 W
- Energy delivered (failure test): 77.5 Wh

## 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.

## Test data

Test procedures: https://www.lithiumsteppe.com/test-procedures

- **Pack Internal Resistance Test** (rinternal): Pack Resistance: 36.1 mOhm (average value of pack resistance between 17.5 and 18.5 V)
  - CSV: [rinternal.csv](tests/rinternal.csv)
  - Bench source file: biswaye_6ah/rinternal_biswaye_6ah_260706-18-44-47_t0.csv
- **Capacity Test** (capacity): Capacity: 106.1 Wh (98% of stated 6 Ah @ 18V Nominal)
  - CSV: [capacity.csv](tests/capacity.csv)
  - Bench source file: biswaye_6ah/capacity_biswaye_6ah_260707-14-34-13_t0.csv
- **Cycling Test** (performance): High-power cycles survived: 20. Failure mode: Battery hit low voltage
  - CSV: [performance.csv](tests/performance.csv)
  - Bench source file: biswaye_6ah/performance_biswaye_6ah_260709-14-38-57_t0.csv
- **Failure Test** (failure): Energy discharged: 77.5 Wh, Peak power: 1539 W
  - CSV: [failure.csv](tests/failure.csv)
  - Bench source file: biswaye_6ah/failure_biswaye_6ah_260713-11-39-48_t0.csv

### CSV format

1 Hz samples. Lines starting with `#` are run metadata (test profile, battery profile, instrument identity, Arduino DAQ channel labels); the first non-`#` line is the column header. Columns vary by run date — Arduino DAQ columns (tc/v/r_ntc/fault) appear on runs logged since 2026-05-11.

- `ts_unix / ts_iso` — sample timestamp (Unix seconds / ISO-8601 local time)
- `elapsed_s` — seconds since test start
- `voltage_v` — pack voltage, V (4-wire remote sense)
- `current_a` — discharge current, A
- `active_power_w` — discharge power, W
- `discharged_ah / discharged_wh` — integrated charge / energy removed
- `phase / target / cycle` — load-profile phase name, setpoint, loop count
- `tc1_C..tc4_C` — Type-K thermocouple temperatures, Celsius (nan = channel absent, disabled, or faulted)
- `v0_V` — DeWalt C3 cell-tap voltage, V
- `v1_V` — DeWalt TH thermistor-pin voltage, V
- `r_ntc_ohms` — pack NTC thermistor resistance, ohms, derived per-tick from v1_V and pack voltage (DeWalt tool thermal cutoff reference: 2140 ohms)
- `fault1..fault4` — MAX31856 status byte per thermocouple, hex (00 = healthy)

## Photos

- Headline photo: photos/headline.jpg
- Teardown 1: photos/teardown_1.jpg — Melting/deformation around the electrodes is typical after destructive/failure test
- Teardown 2: photos/teardown_2.jpg — busbar/PCB design typical of the better-performing packs
- Teardown 3: photos/teardown_3.jpg — Safety fuse keeps resistive heating from tool contacts away from the cells, plus melts at excessive current
- Teardown 4: photos/teardown_4.jpg — Thick tool electrodes resist bending, but needs a more temperature-resistant plastic housing
- Teardown 5: photos/teardown_6.jpg — Cell label: INR18650/30PL, EVE 3.0 Ah

## Files in this dataset

- `README.md` — this file
- `site.json` — the published data record for this battery (machine-readable)
- `tests/{rinternal,capacity,performance,failure}.csv` — raw bench CSVs (see CSV format above)
- `photos/` — headline + teardown photos (captions above)
- `test_procedures.md` — the four bench tests
- `ranking_methodology.md` — how ratings are scored

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Source: Lithium Steppe (https://www.lithiumsteppe.com) — We test DeWalt-compatible power tool batteries on Amazon to guide your purchasing decisions.
Generated: 2026-07-16T19:29:35.850Z (site commit a353b4a)
Contact: https://www.lithiumsteppe.com/contact
