Powering an ice-fishing flasher

A flasher uses very little power. Vexilar sells its FLX-20 packs with a 12-volt, 9 amp-hour battery, which stores about 108 watt-hours.

What Vexilar says

• The flasher line runs on 10.5 to 15 volts, 12 volts nominal.
• The catalog lists 175 mA and 200 mA at 12 volts, and the layout doesn't make clear which one is the FLX-20.
• The FLX-20 Ultra Pack and Pro Pack II come with a 12 V, 9 Ah battery.

one source so far All of this is from a 2018 Vexilar catalog. Vexilar's own site blocks automated reading, so we couldn't check it there.

Source: Vexilar 2018 catalog, read Nov 5, 2026.

What that works out to

Our arithmetic, not Vexilar's claim. 12 V times 9 Ah is 108 Wh. If the flasher draws 200 mA, that's 12 V x 0.2 A = 2.4 W, so about 45 hours on a full battery. At 175 mA it's about 51 hours. We haven't found a Vexilar run-time figure to compare against.

Where a power station fits

A station would be more than a flasher needs. It makes sense if you also run a heater, lights or a charger from the same unit. Add everything to the sizing tool.

What we haven't found

• Current draw for the FLX-20 specifically.
• Real run times in cold weather. We haven't looked, and cold can change how much a battery delivers.
• Other flasher and fish-finder brands.