TierF

Surkibat 20V Battery, 7.5Ah Li-ion Compatible with Dewalt

Tier F

by Surkibat

Test published May 2026

$25.00

This pack will start smoking under normal operation. Bad engineering. Do not buy.

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Ratings

Honesty

1.3 / 5

Actual capacity 3.1Ah. Massively overstated.

Durability

2.1 / 5

Decent built quality, except for the fact that it catches on fire when you use it.

Capacity

2 / 5

3.1Ah measured, averaging 1550 mAh/cell. Extremely poor.

Power

0.5 / 5

Performed middle/bottom of the tiers on the performance and failure tests.

Safety

0.5 / 5

Pack design has a structural flaw -- fire hazard even under normal use.

Testing Statistics

Stated capacity7.5 Ah (135 Wh @ 18 V)

Measured capacity3.1 Ah (55.8 Wh @ 18 V)

Pack internal resistance80.7 mOhm

High-power cycles survived4

Peak sustained power787 W

Energy delivered (failure test)20.8 Wh

Cell notes

Unbranded cells, potentially reclaimed.

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.

Cycles survived: 4 | Failure mode: Stopped before tool cutoff

Capacity Test

We measure the amount of usable energy the pack supplies from 100% to 0% charge.

Capacity: 55.8 Wh (41% of stated 7.5 Ah @ 18V Nominal)

Pack Internal Resistance Test

Pack Resistance: 80.7 mOhm (average value of pack resistance between 17.5 and 18.5 V)

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.

Energy discharged: 20.8 Wh, Peak power: 787 W