TierC

JYJZPB 2 Pack 6.5Ah Replace Battery

Tier C

by JYJZPB

$25.00

All-around "not great" pack. Could work on a drill or other low-power tool.

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Ratings

Honesty

2.4 / 5

Actual capacity 3.9Ah, far short of the 6.5Ah claim.

Durability

0.9 / 5

Low-quality tool contacts risk getting melted plastic on your tool.

Capacity

3 / 5

Actual capacity 3.9Ah, far short of the 6.5Ah claim.

Power

0.5 / 5

Poor cycling test performance. Not suited for heavy use.

Safety

2 / 5

No safety features; battery started a sustained plastic fire during the failure test.

Testing Statistics

Stated capacity6.5 Ah

Measured capacity69.8 Wh

Pack internal resistance67.8 mΩ

High-power cycles survived5

Peak sustained power782 W

Energy delivered (failure test)40.2 Wh

Cost per measured Wh$0.36 / Wh

Cell notes

Lishen LR1865LA. 20-30A max continuous discharge. 2000mAh capacity.

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: 5 | Failure mode: Battery thermistor reached cutoff

Capacity Test

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

Capacity: 69.8 Wh (60% of stated 6.5 Ah @ 18V Nominal)

Pack Internal Resistance Test

Pack Resistance: 67.8 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: 40.2 Wh, Peak power: 782 W