Marine LiFePO4 Batteries

SOK marine LiFePO4 batteries replace the heavy, short-lived AGM and flooded marine batteries that have dominated boats for decades. With sealed plastic IP-rated cases, factory-spec corrosion-resistant terminals, and the same Bluetooth BMS as the rest of the SOK lineup, these batteries cut weight by ~65%, double or triple usable capacity, and deliver 5,000+ deep-cycle life in saltwater environments where lead-acid corrodes out in 2-3 seasons.

Who This Is For

Bass boat and trolling-motor anglers, sailboat cruisers, sportfish boat operators, houseboat owners, kayak fishermen with electronics loads, and any marine operator tired of replacing a $200 AGM every 18 months.

Key Specs to Look For

• Sealed marine-grade case — withstands splash, humidity, salt spray
• Group 24 / Group 27 / Group 31 form factors in 100Ah, 206Ah, 314Ah
• Constant voltage under load — trolling motor power doesn't fall off as battery drains (vs. lead-acid which sags badly)
• Built-in Bluetooth monitoring — check state of charge from your phone
• Dual-purpose: works for starting OR deep-cycle (with appropriate sizing)

Why Buy SOK From Urban Supply

• Authorized SOK Battery dealer — every battery covered by full manufacturer warranty
• Free shipping on orders over $299 (exclusions apply for LTL freight items)
• Best price guarantee — find it lower, we'll price match
• Flexible financing via Shop Pay Installments
• 30-day return policy on unopened, undamaged batteries
• 30-minute response time on all customer emails

Why Choose SOK LiFePO4

A 100Ah SOK at 28 lb replaces a 100Ah AGM at 65 lb — that's 37 lb of weight off your bow per battery. Across a 36V trolling motor bank (3 batteries), you'd lose 111 lb. Faster on plane, better fuel economy, and the AGMs never matched the depth of discharge or cycle life SOK delivers.

Frequently Asked Questions

Can I use SOK as a starting battery?
Yes for outboards with low cranking current (most modern 4-stroke up to ~200HP). For larger inboards or diesels, verify your engine's cranking amp requirement against the SOK's continuous discharge rating.

Are SOK batteries safe in saltwater environments?
The sealed plastic-case models (P suffix) are IP-rated against splash and humidity. Always protect terminals with dielectric grease and keep the battery compartment well-ventilated.

Will my boat's charger work with LiFePO4?
Most modern multi-stage marine chargers (ProMariner, Minn Kota, Noco) have LiFePO4 profiles. Older lead-acid-only chargers will undercharge or overcharge — replace with a LiFePO4-capable unit.