Ultimate question is: Is the 18500 battery in the shop sufficient for a neopixel setup?

I am converting a once Rebel Star into a neopixel blade, double strip with about 120 each. Running it all on a NBv4. My original saber had the 18500 battery from the shop. When testing the neo blade, it kills the battery when the blade is almost fully ignited. I then have to recharge the battery at that point. I have recharged overnight to ensure its a "full charge" with the same result. Swapping for a 18650 runs perfectly fine. Is the battery not sufficient or should i replace it? I need the smaller 18500 battery as im setting it up in a Roman's MK1 with a crystal chamber.