Epoch Batteries
Kayak, marine, and compact off-grid power
A lightweight 12V 50Ah lithium battery for kayak trolling motors, marine fish finders, small off-grid power, and portable 12V systems.
The Epoch 12V 50Ah Essential Series LiFePO4 battery stores 640Wh of energy (0.64kWh nominal, at 12.8V) in a compact 14.3 lb case with a BCI Group 22NF footprint. Built for kayak anglers, small boaters, RV owners, and DIY power-box builders, this Bluetooth-enabled deep-cycle battery combines stable LiFePO4 output, smart BMS protection, IP54 weather resistance, and an 11-year limited warranty in one maintenance-free 12V lithium upgrade.
A lightweight 12V deep-cycle battery for kayaks, small boats, and portable off-grid power.
Kayak anglers and small boaters have to protect every pound of payload. Replacing a heavy lead-acid battery with this compact 12V 50Ah lithium battery can dramatically reduce battery weight, improve handling, free up storage space, and make the battery easier to carry from truck to launch.
With 640Wh of stored LiFePO4 energy (Epoch plans runtime on about 512Wh, 80% of nominal) and a flat voltage curve, this battery is built for users who want reliable runtime without watering, acid fumes, or the voltage sag common with traditional lead-acid batteries.
LiFePO4 output helps maintain steady voltage for kayak trolling motors and sensitive marine electronics. Use it for compatible 12V trolling motors whose maximum current draw is at or below 50A continuous, Garmin, Lowrance, Humminbird, and similar fish finder setups, lighting, pumps, and onboard accessories where total current draw stays within the battery rating.
Instead of cutting into a kayak dashboard for a physical gauge, monitor battery status from your smartphone. The free Epoch Pro app gives compatible iOS and Android users visibility into state of charge, voltage, current, temperature, and BMS status while on the water. If the app asks for a PIN, it is printed on the battery label or in the product documentation.
The enclosed LiFePO4 design contains no liquid acid, helping eliminate spill and fume concerns in portable power boxes or tight kayak compartments. Secure the battery properly, protect the terminals, and avoid submersion or standing water around the case.
A compact LiFePO4 battery for compatible 12V auxiliary systems. It is not a drop-in replacement for every lead-acid installation.
Clean 12V lithium power for kayak anglers, marine electronics, portable solar, and small auxiliary systems.
Recommended add-ons for a complete kayak, marine, or portable power installation.
Full technical details for the Epoch 12V 50Ah Essential Series LiFePO4 battery.
| General | |
|---|---|
| Brand | Epoch Batteries |
| Model / SKU | 1250A-ES |
| Series | Essential Series |
| Battery type | Bluetooth deep-cycle LiFePO4 battery |
| Primary applications | Kayak trolling motors, marine electronics, fish finders, small RV/van systems, portable solar, backup, and 12V auxiliary loads |
| Chemistry | LiFePO4 / Lithium iron phosphate |
| Cell configuration | 4S LiFePO4 |
| Bluetooth monitoring | Yes — free Epoch Pro app for compatible iOS and Android devices: state of charge, voltage, current, temperature, and BMS status |
| Bluetooth PIN | If the app asks for one, it is printed on the battery label or in the product documentation |
| Internal heating | No — this model is not self-heated |
| Cycle life | 4,000+ cycles |
| Warranty | 11-year limited warranty: free replacement in Years 1–3, then 40% off MSRP on a replacement battery in Years 4–11. Register within 90 days or keep your proof of purchase. |
| Voltage and capacity | |
| Nominal voltage | 12.8V |
| Nominal capacity | 50Ah |
| Stored energy | 0.64kWh / 640Wh (nominal) |
| Runtime planning energy | About 512Wh (80% of nominal) |
| Estimated runtime | About 10.2 h at 50W, 5.1 h at 100W, 4.0 h at 10A (128W), 2.0 h at 250W, 1.0 h at 500W (DC loads at 25°C, new fully charged battery) |
| Operating voltage range | 10.0V – 14.6V |
| Maximum charge voltage | 14.6V |
| Current ratings | |
| Max continuous discharge | 50A |
| Peak discharge | 170A for up to 3 seconds |
| Max continuous charge | 50A, all charging sources combined |
| Recommended charge current | 25A (0.5C, 50% of capacity) |
| Inverter sizing | Inverter DC input current within 50A (about 640W at 12.8V); usable AC output is lower |
| Deep-cycle load warning | Do not design continuous loads above the 50A per-battery continuous limit; 170A is a 3-second peak only |
| Series and parallel configuration | |
| Series connections | Max 4 batteries in series (24V, 36V, or 48V system classes) |
| Parallel connections | Max 4 batteries in parallel |
| Maximum parallel capacity | Up to 200Ah / 2.56kWh with four matched batteries in parallel |
| Maximum configuration | 4S4P (16 matched batteries): 51.2V nominal, 200Ah, 10.24kWh |
| Bank batteries | Matched 1250A-ES batteries of the same age, condition, and state of charge; fully charge each before connecting it into a bank |
| Dimensions and weight | |
| Length | 9 in (229 mm) |
| Width | 5⅝ in (143 mm) |
| Height | 8¼ in (210 mm) |
| Height with terminal bolts | 8⅝ in (219 mm) |
| Overall dimensions | 9 in L × 5⅝ in W × 8¼ in H (229 × 143 × 210 mm) |
| Footprint | BCI Group 22NF |
| Weight | 14.3 lb / 6.5 kg |
| Case | Compact Essential case |
| Mechanical and environmental | |
| Enclosure protection | IP54 per IEC 60529 |
| Weather resistance | Dust protected and splash resistant; not waterproof or submersible |
| Terminal type | Bolt terminals — use the supplied hardware and the torque on the product labeling |
| Mounting orientation | Upright, unless Epoch documentation for this model allows otherwise |
| Charge temperature range | 0°C to 55°C / 32°F to 131°F |
| Discharge temperature range | -20°C to 60°C / -4°F to 140°F |
| Recommended storage temperature | 0°C to 35°C / 32°F to 95°F, maximum 12 months |
| Long-term storage | About 50% state of charge or higher, loads disconnected; check and recharge at least every 3 months |
| Self-heating | No |
| Low-temperature charge protection | Yes — the BMS blocks charging below 0°C / 32°F |
| Recommended charging settings | |
| Charger type | 12V LiFePO4-compatible charger, converter, inverter charger, solar controller, or DC-to-DC charger |
| Compatible charger | Epoch 12V 15A Lithium Battery Charger |
| Maximum continuous charge | 50A, all charging sources combined |
| Recommended charge current | 25A for one battery; 50% of bank capacity for multi-battery banks |
| Bulk / absorption voltage | 14.2V – 14.6V |
| Absorption time | 30 minutes per 200Ah of bank capacity |
| Float voltage | 13.4V – 13.8V; float disabled preferred where supported |
| Re-bulk voltage | 13.2V if programmable |
| Equalization | Disabled |
| Temperature compensation | 0mV/°C (disabled) |
| BMS high-voltage cutoff | 14.6V |
| SOC recalibration voltage | 14.6V |
| Alternator charging | DC-to-DC charger programmed for LiFePO4 |
| Protection and compliance | |
| Battery management | Built-in smart BMS |
| BMS protection | Overcharge, over-discharge, over-current, short circuit, and high- and low-temperature disconnects |
| Overcurrent protection | Install a fuse or DC-rated breaker as close as practical to the battery positive terminal |
| Compliance marks | CE, RoHS |
| Transport | UN 38.3 |
| Support | US-based technical support |
Splash resistant protection for daily marine and outdoor use.
The IP54-rated enclosure is dust protected and splash resistant, making this battery suitable for everyday kayak, marine, RV, camping, and outdoor power use. It should not be submerged, pressure washed, or installed where standing water can collect around the battery.
More usable energy, less maintenance, and easier handling.
LiFePO4 technology provides stable voltage output, long cycle life, fast charging capability, and maintenance-free operation. For kayak anglers and small boat owners, the biggest everyday benefits are simple: less weight to carry, less space taken up in the hull, no liquid acid, and better visibility through Bluetooth monitoring.
Verify your kayak, boat, charger, and wiring before installation.
The 1250A-ES is not a drop-in replacement for every lead-acid installation. Always confirm compartment dimensions against the 9 in L × 5⅝ in W × 8¼ in H case (8⅝ in H with terminal bolts), battery box fitment, hold-down method, cable clearance, terminal protection, fuse sizing, charger compatibility, and total system current draw before installation. Mount the battery upright unless Epoch documentation for this model allows another orientation, install a fuse or DC-rated breaker as close as practical to the positive terminal, and tighten the terminals with the supplied hardware to the torque on the product labeling. Use a lithium-compatible charger programmed within Epoch’s recommended charging parameters. For series or parallel battery banks, use matched batteries of the same model, age, capacity, and state of charge, fully charge each one before connecting it, and follow Epoch’s installation guidelines.
Frequently asked questions
Common questions about trolling motors, fish finders, Bluetooth monitoring, charging, and installation.
Yes, for many compact 12V kayak trolling motor setups, when the motor’s maximum current draw is at or below 50A continuous and the wiring, fuse, controller, and charger are within the battery ratings. Use the motor manufacturer’s maximum current draw, not its average. The battery stores 640Wh (nominal); Epoch plans runtime on about 512Wh (80%), so a steady 10A draw runs for about 4 hours and a 500W load for about 1 hour. Real runtime depends on boat weight, speed setting, wind and current, and how often the motor runs at full throttle.
Yes. LiFePO4 batteries provide stable voltage output that is well suited for sensitive marine electronics. This makes the battery a clean power source for fish finders, sonar, GPS units, chartplotters, lighting, pumps, and other 12V accessories where the total current draw stays within the battery’s ratings.
This battery includes built-in Bluetooth monitoring. Open the free Epoch Pro app on a compatible iOS or Android device to view state of charge, voltage, current, temperature, and BMS status or protection alerts without installing a separate dashboard monitor. If the app asks for a PIN, use the one printed on the battery label or in the product documentation.
Install it upright unless Epoch documentation for this exact model allows another orientation. The LiFePO4 design contains no liquid acid, which eliminates the acid spill concerns of flooded lead-acid batteries, but the manual still calls for an upright installation. In kayak hulls and compact battery boxes, secure the battery so it cannot slide or tip, protect the terminals from spray, keep it out of bilge water, and leave clearance above the terminals for cables and covers.
This model is rated IP54, meaning it is dust protected and splash resistant for everyday marine, mobile, and outdoor use. It should not be submerged, pressure washed, or installed where standing water can collect around the battery.
Use a 12V LiFePO4-compatible charger, such as the Epoch 12V 15A Lithium Battery Charger, or a converter, solar charge controller, inverter charger, or DC-to-DC charger programmed for LiFePO4. Recommended settings: 14.2V to 14.6V bulk/absorption, 30 minutes of absorption per 200Ah of bank capacity, float off (preferred) or 13.4V to 13.8V, re-bulk at 13.2V if programmable, and equalization and temperature compensation disabled. Charge at the recommended 25A and never more than 50A from all sources combined. Avoid lead-acid desulfation or equalization modes.
No. This model has no internal heater. Below 0°C (32°F) the battery management system blocks charging to protect the cells, though the battery can still discharge down to -20°C (-4°F). Move it somewhere warmer and let it come back into its 0°C to 55°C (32°F to 131°F) charging range before charging, and never bypass the protection.
Yes. This model supports up to 4 batteries in series (24V, 36V, or 48V system classes) and up to 4 in parallel (up to 200Ah at 12V); the largest bank is 4S4P, 16 batteries for 51.2V, 200Ah, and 10.24kWh. Use only matched 1250A-ES batteries of the same age, capacity, and state of charge, fully charge each one before connecting it into a bank, and use properly sized cables, fuses, bus bars, and charging equipment rated for the full bank voltage.
No. This is a dedicated deep-cycle LiFePO4 battery, not a cranking battery. It is designed for sustained auxiliary loads such as trolling motors, marine electronics, lights, pumps, RV accessories, portable solar, and backup power. Use a cranking-rated battery for engine starting.
