User error in selecting the wrong battery - my cheap 1500mah batteries should last about 1000 +(probably less if all a little longer in the exposure length.) For a longer power supply I'll use a 12V Portable 9800mAh battery with a DC-DC Converter Board Voltage Regulator Stepdown Module wired into a cheap battery.
MzytengaM - small crabs and hermit crabs in the foreground. Once I work out the bulb ramping I'll try ans make these more interesting.