Selecting replacement battery management IC

[FrankT]

I was replacing the batteries in my Fly12 (bicycle light/camera) - a pair of batteries in parallel, with a management PCB, when I stupidly forgot the circuit is under power and grabbed then with metal clamps - lots of sparks, no smoke, but the circuit no longer works.

I reverse engineered the circuit and it looks identical to the samples in chips like this (sot-26 version)...

https://datasheet.lcsc.com/lcsc/1804140042_Diodes-Incorporated-AP9101CK6-ADTRG1_C151339.pdf

The problem is, there are many variants of chip with different charging characteristics - in this datasheet about 60 (starting on page 12).

The markings on this chip is Y1AF.

Does anyone know an easier way of finding this exact chip (I've just spent an hour scanning datasheets).

Alternatively, can someone recommend a chip with a safe set of protection parameters to work with a pair of NCR18650B in parallel?

Thanks,
Frank