Presuming maybe? The capacity of the F1L is above 3100mAh at 0.5A typical analyzing charger discharge rates. It does not really match that well, and is a foreign cell anyway.
Maybe it is this:
Source: https://www.alibaba.com/product-detail/Widely-used-DLG-3-7v-rechargeable_60778057357.html
This one matches better and is easily available in china. Sold under different wraps, Sofirn included:
Check here for related discussion.
Cheers :-)