The protection circuit looks like it is checking both cell groups, but without balancing.
Capacity is considerable better than rated. The over current protection will trip at loads much above 5A (This is temperature depend).
The pack was up to about 51° during my test (Measured in the pouch).
The pack can easily drive a 10W load, but 30W is a bit much (25W would probably be fine).
Conclusion
The pack works fine, but has a fairly low capacity (4 high capacity cells would give the same performance).
Is there any charger for these 2S packs you can recommend (outside of a hobby charger)? IIRC you have checked a couple of these in the past and none of these terminated. I don’t feel safe relying on the protection circuit to terminate on cell overvoltage.
HKJ where have you measured voltage, was it at protection circuit output (P+, P~~), at cells side (B+, B~~) or at connector?
It is strange to get so much more capacity than rated, specialy when brand is not known. At 5A it is obvious cells can stand only low current up to 1A/cell.
Thanks, this might explain quite big voltage drop at higher currents or you think it is more cells related? Shurely there is some resistance in circuit and cables, still probably not that much.
All the bikelight batteries i used failed after time because there is no balancing circuit.
After a couple of months there is such a large unbalance between the two sets of parallel cells that the maximum useable capacity of the battery pack becomes very low.
When i connect such battery pack to the hobbycharger (cells connected directly to the charger) , the capacity gets back to “normal” (i never had a bikelight battery pack that delivered the promised capacity).