I use LG HG2 and Sony VT6 18650 batteries if not the OG, both 3000mah and both get extra sessions over the OG. That said, Molicell seem to be the battery of choice for vaping, the P28a (2800mah) or their new P30b(3000mah).
As @cannabis.pro said, the 3800mah is a red flag, make sure you purchase...