Why Your 100Ah Lead-Acid Is Really a 50Ah Battery
The WNRLN MR-12100-LFP 12V 100Ah LiFePO4 Marine Battery delivers 90Ah of usable energy — 80% more runtime for your trolling motor, fish finder, and
onboard electronics.
The Lead-Acid Problem
- 50% Usable Capacity: A 100Ah lead-acid battery can only be discharged to 50% before
voltage collapse — effectively a 50Ah battery
- Voltage Sag: Below 50% charge, trolling motor thrust fades and electronics
flicker
- Off-Season Death: Lead-acid sulfates during winter storage — lithium self-discharges
under 2% per month
- Weight Penalty: 100Ah lead-acid weighs 28-32 kg vs 12.5 kg for lithium — 2.5x
heavier
Why WNRLN MR-12100-LFP
- 90Ah Usable from 100Ah Rating: LiFePO4 allows 90% depth of discharge — 80% more runtime than
lead-acid
- 5,000+ Deep Cycles: At 50 fishing trips per year, this battery outlasts your boat
- IP67 Fully Sealed: Submersion-rated marine-grade aluminum enclosure with stainless
steel terminals
- 4S 100A Smart BMS: Low-voltage cutoff, over-current and short-circuit protection
- ABYC Compliant: Meets American Boat and Yacht Council standards for lithium
battery installation
Application Scenarios
| Scenario | Why MR-12100-LFP |
|---|
| Trolling Motor | 90Ah usable = 6-8 hours continuous trolling at medium speed — 80%
longer than lead-acid |
| Sailboat House Bank | Powers navigation, lighting, refrigeration, autopilot — decades of
liveaboard service |
| Bass Boat Electronics | Stable 12.8V keeps fish finders, GPS, livewell pumps running all
day without voltage sag |
| Marine Auxiliary | Dedicated power for windlass, bow thruster, dinghy motor — saves 20
kg vs lead-acid |
Technical Specifications
| Parameter | Specification |
|---|
| Battery Type | LiFePO4 |
| Nominal Voltage | 12.8V (12V nominal) |
| Capacity / Energy | 100Ah / 1280 Wh |
| Usable Capacity | 90Ah (90% vs 50% lead-acid) |
| Cycle Life | 5,000+ cycles |
| BMS | 4S 12V 100A Smart BMS |
| Waterproof | IP67 |
| Weight | 12.5 kg |
| Dimensions | 330 x 175 x 220 mm |
FAQ
Q: How is 90% usable different from lead-acid?
A: A 100Ah lead-acid battery can only be discharged to 50% (50Ah
usable) before voltage drops below 11.5V. The MR-12100-LFP delivers
90Ah usable — effectively 80% more runtime from the same Ah rating.
Q: Can I use this with my existing marine charger?
A: We recommend a 12V 20A LiFePO4 smart charger. Standard lead-acid
chargers with desulfation modes can damage lithium cells. Charger
add-on: USD 65 with bulk orders.
Q: Warranty?
A: 3-year standard. CE, UN38.3, MSDS certified. ABYC compliant
design.
Ready for 80% more fishing time per charge? Contact us for bulk
pricing and sample evaluation.
