# waitley 20V 6.0Ah Replacement

- Manufacturer: waitley
- Tier: A
- Price: $22.50
- Stated capacity: 6 Ah
- Amazon listing: https://www.amazon.com/dp/B0C1RCN377?tag=lithiumsteppe-20
- Battery page: https://www.lithiumsteppe.com/battery/waitley_6ah

## Summary

A standout pack that I can strongly recommend. Fantastic electrical performance, matching or exceeding DeWalt's battery for literally 1/3 the cost, plus a working engineered safety fuse. Only failure mode is the tool contacts, which could bend out of shape and fail over time. Improve that and this becomes the instant S-tier 3rd-party champion.

## Ratings

- **Honesty**: 3/5 — Actual capacity is 4.3 Ah, vs 6 Ah advertised.
- **Durability**: 2.6/5 (teardown 2.5/5, cycling 2.6/5) — Flimsy tool-contacts are a legitimate failure mode, but otherwise robust.
  - Teardown notes: Flimsy tool-contacts are a legitimate failure mode, but otherwise robust.
- **Capacity**: 3/5 — 4.3 Ah capacity.
- **Power**: 5/5 — Solid cells and great electrical construction make this a high-performing battery.
- **Safety**: 5/5 — Only tested battery (so far) with a thermal/mechanical fuse built in. It activates reliably too.

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

## Testing statistics

- Stated capacity: 6 Ah (108 Wh @ 18 V)
- Measured capacity: 4.3 Ah (76.6 Wh @ 18 V)
- Pack internal resistance: 69.0 mOhm
- High-power cycles survived: 10
- Peak sustained power: 1002 W
- Energy delivered (failure test): 39.6 Wh

## Cell notes

PROSpower PROS18650F2. 20A max continuous discharge. 2000mAh capacity.

## Test data

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

- **Pack Internal Resistance Test** (rinternal): Pack Resistance: 69.0 mOhm (average value of pack resistance between 17.5 and 18.5 V)
  - CSV: [rinternal.csv](tests/rinternal.csv)
  - Bench source file: rinternal_waitley_6ah_260506-18-04-57_post-update-t1.csv
- **Capacity Test** (capacity): Capacity: 76.6 Wh (71% of stated 6 Ah @ 18V Nominal)
  - CSV: [capacity.csv](tests/capacity.csv)
  - Bench source file: waitley_6ah/capacity_waitley_6ah_260522-13-58-58_multi-repeatability.csv
- **Cycling Test** (performance): High-power cycles survived: 10. Failure mode: Battery thermistor reached cutoff
  - CSV: [performance.csv](tests/performance.csv)
  - Bench source file: waitley_6ah/performance_waitley_6ah_260511-16-26-25_0.csv
- **Failure Test** (failure): Energy discharged: 39.6 Wh, Peak power: 1002 W
  - CSV: [failure.csv](tests/failure.csv)
  - Bench source file: waitley_6ah/failure_waitley_6ah_260528-11-30-47_0.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.png
- Teardown 1: photos/teardown_1.jpg — Minimal melting on external of pack
- Teardown 2: photos/teardown_2.jpg — Waitley packs have a passive safety feature: a mechanical failure joint. Very reliable too. Amazing!
- Teardown 3: photos/teardown_3.jpg — Close up of melted failure joint
- Teardown 4: photos/teardown_4.jpg — Solid current routing and robust mechanical construction
- Teardown 5: photos/teardown_5.jpg
- Teardown 6: photos/teardown_6.jpg — Flimsy tool electrodes that are prone to bending and failure. This battery came with one already bent out of place.
- Teardown 7: photos/teardown_7.jpg — Notice no cell rupturing due to mechanical failure point. Cell label: PROS18650F2 3.6V 25H312Y10 / 25H292Y10

## 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: 2026-07-16T19:29:37.926Z (site commit a353b4a)
Contact: https://www.lithiumsteppe.com/contact
