Your sigelei mod has the battery pins soldered to the chip in a bad way. Just from dropping your batteries in the mod weakens them. I've had two 213 mods break at the batt contacts to the chip. On my spectrum I put the batteries in real easy to avoid this problem. Also check the top of the mod and make sure it's not coming apart. The 2 screws are only being held by thin plastic and one drop can break the anchor points.
Hi, thank you for the tips, its the first sigelei i’ve tried.
I always drop them in the mod, I will be gentle from now on too see how much further it can last.