Shockli 4x18650 7.4V 4400mAh

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Official specifications: Shockli%204x18650%207.4V%204400mAh-info

This is a four cell bicycle battery pack.

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The cells is packed in rubber and includes a pouch for mounting the pack on the bike.

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Inside the rubber the batteries are packed in two layers of shrink wrap.
The cable do not have a real strain relief, but the shrink wrap helps keeping it in.

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The pack uses Chinese batteries, not really a surprise with a 4400mAh pack rating.

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The protection circuit looks like it is checking both cell pairs, but without balancing.

Shockli%204x18650%207.4V%204400mAh-Capacity

Capacity is considerable better than rated. The over current protection can trip at 5A load (This is temperature depend).
The pack was up to about 53° during my test (Measured in the pouch).

Shockli%204x18650%207.4V%204400mAh-CapacityTimeHours

Shockli%204x18650%207.4V%204400mAh-CapacityTime

Shockli%204x18650%207.4V%204400mAh-Energy

Shockli%204x18650%207.4V%204400mAh-PowerLoadTime

The pack can easily drive a 10W load, but 30W is a bit much (25W would probably be fine).

Shockli%204x18650%207.4V%204400mAh-TripCurrent

Shockli%204x18650%207.4V%204400mAh-Charge



Conclusion

The pack works fine, but has a fairly low capacity.



Notes and links

The battery was supplied by Shockli for review.

How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries