# Ndoge True 8000mAh Replacement for DeWalt 20V Max Battery

- Manufacturer: Ndoge
- Tier: F
- Price: $17.25
- Stated capacity: 8 Ah
- Amazon listing: https://www.amazon.com/dp/B0FXDVBLGK?tag=lithiumsteppe-20
- Battery page: https://www.lithiumsteppe.com/battery/ndoge_8ah

## Summary

One of the worse performing packs we tested. Do not buy.

## Ratings

- **Honesty**: 1.2/5 — Actual capacity is 3.1 Ah, vs 8 Ah advertised. Complete lie.
- **Durability**: 0.7/5 (teardown 0.5/5, cycling 1/5) — Flimsy tool contacts and abysmal electrical construction. Not durable.
  - Teardown notes: Flimsy tool contacts and abysmal electrical construction. Not durable.
- **Capacity**: 2/5 — One of the lowest capacities tested at 3.1 Ah.
- **Power**: 0.5/5 — Not capable of high power; very poor electrical construction.
- **Safety**: 3/5 — Not particularly safe, not particularly unsafe; the battery is not capable of high-power discharge.

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

## Testing statistics

- Stated capacity: 8 Ah (144 Wh @ 18 V)
- Measured capacity: 3.1 Ah (55.2 Wh @ 18 V)
- Pack internal resistance: 109.4 mOhm
- High-power cycles survived: 3
- Peak sustained power: 723 W
- Energy delivered (failure test): 18.5 Wh

## Cell notes

Different cells even within the same 4-pack of batteries. Implied 6C / 12A max continuous discharge. 1500mAh and 2000mAh capacity across cells.

## Test data

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

- **Pack Internal Resistance Test** (rinternal): Pack Resistance: 109.4 mOhm (average value of pack resistance between 17.5 and 18.5 V)
  - CSV: [rinternal.csv](tests/rinternal.csv)
  - Bench source file: ndoge_8ah/rinternal_ndoge_8ah_260521-17-33-19_0.csv
- **Capacity Test** (capacity): Capacity: 55.2 Wh (38% of stated 8 Ah @ 18V Nominal)
  - CSV: [capacity.csv](tests/capacity.csv)
  - Bench source file: ndoge_8ah/capacity_ndoge_8ah_260522-08-55-37_0.csv
- **Cycling Test** (performance): High-power cycles survived: 3. Failure mode: Stopped before tool cutoff
  - CSV: [performance.csv](tests/performance.csv)
  - Bench source file: ndoge_8ah/performance_ndoge_8ah_260528-10-18-31_0.csv
- **Failure Test** (failure): Energy discharged: 18.5 Wh, Peak power: 723 W
  - CSV: [failure.csv](tests/failure.csv)
  - Bench source file: ndoge_8ah/failure_ndoge_8ah_260528-11-15-11_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 pack deformation from heating
- Teardown 2: photos/teardown_2.jpg — Crap current routing joints failed early; notice the exact same failure mode in 2 packs tested back to back
- Teardown 3: photos/teardown_3.jpg — Abyssmal current routing schema; plus flimsy tool electrodes prone to bending out of place
- Teardown 4: photos/teardown_4.jpg
- Teardown 5: photos/teardown_5.jpg — Two completely different cells within the same 4-pack from Amazon. Not a great sign. Cell labels: CJ 18650-2000mAh 3.7V SI227A4IL // CJ INR18650 1500mAh-5C 3.7V SI192B4IL 1500mAh 5.55Wh

## 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: 2026-07-16T19:29:37.248Z (site commit a353b4a)
Contact: https://www.lithiumsteppe.com/contact
