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Vexilar 12V Lithium vs MarCum Brute 10Ah
Short answer: Both are 12 V LiFePO4 flasher packs under 3 lb: Vexilar's is 9.6 Ah, MarCum's Brute is 10 Ah / 128 Wh with a 2,000-cycle rating and -20 to 60 C operating range.
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Lithium iron phosphate (LiFePO4) packs weigh about a third of what the old sealed lead-acid batteries did, and they hold voltage better in the cold.
Spec comparison
| Vexilar 12 V lithium (V-100L) | MarCum Brute (LP41210) | |
|---|---|---|
| Chemistry | LiFePO4 | LiFePO4 |
| Capacity | 9.6 Ah (Vexilar markets it as 9 Ah) | 10 Ah / 128 Wh |
| Weight | 2.75 lb | 2 lb 11 oz |
| Size | 5-15/16 × 3-11/16 × 2-9/16 in | 5-7/8 × 2-1/2 × 3-5/8 in |
| Cycles | Check listing | 2,000 |
| Operating range | Check listing | -20°C to 60°C |
| Charger | Vexilar 1 A lithium charger | 10 A charge rate; kit with 3 A charger |
Sources: vexilar.com 12 Volt/9 Amp Lithium Battery page and retailer listing of the V-100L; marcumtech.com Brute page (Oct 2026).
Run-time math
The Vexilar FLX-28 draws about 260 mA, so 9 Ah is on paper roughly 34 hours. Cold cuts that. Keep the pack in the case and charge it with the lithium charger it's rated for.
Live sonar needs a much bigger pack. See flasher vs live sonar.
Where to buy
Vexilar lithium: Buy at Vexilar →
MarCum Brute: Buy at MarCum →
Related guides
- Forward-Facing Sonar for Ice: LiveScope Plus vs MEGA Live 2 vs ActiveTarget 2
- Ice Flashers Compared: Vexilar FLX-28 vs MarCum M1 vs Humminbird ICE Helix 7
- Flasher vs Forward-Facing Sonar: A Beginner's Guide
- Vexilar FLX-28 vs MarCum M5: Flagship Flashers Compared
Written by Cory Arnold, Iron County, Michigan. Specs checked October 2026.
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