Essential Series
12V 172Ah Cranking & Deep Cycle (Dual Purpose) LiFePO4 Battery
$899
IP65BluetoothStarting & Cranking
Capacity: 172Ah
- 11-year warranty
- US-based support
- Available to ship today
Features at a glance
- IP65Weatherproof
Dust-tight and protected against water jets from any direction. Not submersible.
- 4,000+Cycle life
Over 10 years at one full cycle a day. Rated at the depth of discharge, charge rate and temperature stated on the datasheet, to its end-of-life capacity.
- iOS + AndroidBluetooth app
Charge, voltage and temperature on your phone in the Epoch Li-Ion app.
- Advanced BMSProtection
Guards against overcharge, over-discharge, overcurrent and short circuit.
- LiFePO4Thermal stability
Lithium iron phosphate has a far lower thermal-runaway risk than other lithium chemistries. The BMS adds over-temperature and low-temperature charge protection.
- 12V 172Ah Dual-Purpose LiFePO4 (2.20kWh): A 12.8V nominal, 172Ah Essential Series battery that combines engine cranking and deep-cycle house power in one BCI Group 31 case and stores 2.20kWh (2,202Wh, nominal). It is not a drop-in replacement for every lead-acid installation: check tray fit, terminal clearance, cable size, overcurrent protection, charger profile, and engine and alternator compatibility first.
- Cranking Power (Approx. 1,000 CCA Equivalent): 1,000A for up to 5 seconds, for engine cranking only. Epoch's compatibility target is outboards up to 250hp when the engine's battery requirements, alternator output, wiring and charging profile match.
- 200A Continuous for House Loads: 200A maximum continuous discharge for fish finders, GPS, radios, livewell and bilge pumps, lighting and other 12V loads. Keep every load that lasts longer than 5 seconds at or below 200A, and keep enough charge in reserve to start the engine.
- 200A Charging: 200A maximum continuous charge current from all sources combined (86A recommended) at 14.2-14.6V bulk/absorption. Program every charger, inverter charger, solar controller and DC-to-DC charger for LiFePO4, and use a DC-to-DC charger or lithium-ready regulation where the alternator needs it.
- No Internal Heating: Rated to charge from -5°C to 55°C (23°F to 131°F), but program chargers to charge only between 0°C and 55°C (32°F and 131°F). The BMS blocks charging when the battery is too cold, and it can still discharge down to -20°C (-4°F).
- Bluetooth Monitoring: The free Epoch Li-Ion app (iOS and Android) shows state of charge, voltage, current, temperature and BMS status.
- Advanced BMS Protection: Protects against overcharge, over-discharge, over-current, short circuit, and high and low temperature. Install a DC-rated fuse or breaker as close as practical to the positive terminal, sized for engine cranking current as well as house loads.
- IP65 Rated: Dust-tight and protected against low-pressure water jets. Not submersible: do not submerge or pressure-wash it, or install it where standing water can collect, such as a bilge.
- Group 31 Footprint: 12.91 × 6.22 × 8.46 in (328 × 158 × 215 mm) and 40 lb (18.14kg), with M8 female terminals torqued to 8-12 Nm (71-106 in-lb).
- Parallel Only: Up to 4 matched 12172A-DP batteries in parallel (688Ah, 8.81kWh at 12.8V). Series wiring is not approved for this model.
- 4,000+ Cycle Life & Maintenance-Free: No watering, acid service or lead-acid equalization; routine inspections keep it safe.
- 11-Year Manufacturer Warranty: Register within 90 days of purchase for full warranty coverage.
Configuration
Cell Configuration: 4S1P
Chemistry: LiFePO4
Current
Ah Capacity: 172Ah
Max Continuous Discharge Amps: 200A
Max Charge Current Amps: 200A (86A recommended)
Max Discharge Peak Current Amps: 1,000A (up to 5 Seconds, cranking only)
Series | Parallel: Parallel only: Max (4) in Parallel (688Ah); series not approved
Voltage
Voltage: 12.8V
Max Charge Voltage: 15.0V (maximum input rating, not a charger target; charge at 14.2 - 14.6V)
Operating Voltage Range: 10.0V - 14.6V
Temperature
Charge Temp Range: −5°C (23°F) / 55°C (131°F) (battery rating; program chargers for 0°C (32°F) / 55°C (131°F))
Discharge Temp Range: -20°C (-4°F) / 60°C (140°F)
Storage Temp: 0°C (32°F) / 35°C (95°F) (recommended)
Weight: 40 lbs
Dimensions
Length: 12.91 (inches)
Width: 6.22 (inches)
Height: 8.46 (inches)
BCI Group 31 footprint. Verify tray dimensions, terminals, wiring and charging-system compatibility before installation.
Cell certification: UL 1642 (cells)
Thermal runaway testing: UL 9540A (cells)
Battery certification: IEC 62619:2022
Compliance marks: CE, RoHS
Transport: UN 38.3, Class 9
Maximum Continuous Charge Current: 200A per battery, all charging sources combined
Recommended Charge Current: Up to 86A (0.5C) for one battery; up to 50% of bank capacity for parallel banks (172A for 2P, 258A for 3P, 344A for 4P), within charger, wiring and system limits
Bulk/Absorption: 14.2V-14.6V
Absorption Time: End when current falls to C/20 (about 8.6A) or after 15 minutes, whichever comes first
Float Voltage: Disabled (preferred, where the charger supports it) or 13.4V-13.8V
Re-bulk: 13.2V (if programmable)
Temperature Compensation: 0 mV/°C (disabled)
Equalization: Disabled; do not use lead-acid equalization, desulfation or repair modes
Charge Temperature Range: Program chargers for 0°C to 55°C (32°F to 131°F). The battery is rated to charge from -5°C (23°F), but it has no internal heating, and the BMS blocks charging when it is too cold
BMS High Voltage Cutoff: 14.6V
SoC Recalibration: 14.6V
Maximum Charge Input: 15.0V maximum input rating, not a charger target
Compatible Chargers: 12V LiFePO4 chargers, converters, inverter chargers and solar charge controllers that can be set to the values above; a charger below the recommended 86A is suitable, it simply takes longer
Alternators: use a DC-to-DC charger or lithium-ready regulation where needed, and confirm the outboard or engine maker's charging requirements
NOTE: Not all chargers can do multistage lithium charging. If yours cannot be fully programmed, verify that its bulk/absorption voltage is within range and that equalization and temperature compensation are disabled. Consult the charger manual or manufacturer.
Epoch Li-Ion App
Still have questions?
We're here to help! Give us a call and talk with a US-based technical expert.
1/4
Hover to zoom
Downloadable resources
Applications & use cases
- Marine engine starting (outboards up to 250hp when requirements match)
- Dual-purpose boat systems (starting plus house power)
- Bass boats and pontoons
- Skiffs and center consoles
- Marine electronics and fish finders
- Livewell and bilge pumps and lighting
- RV and camper house power
- Van and overland 12V systems
- Solar battery banks and inverter systems
- Cabins and backup power
- 12V house banks up to 4 in parallel
Marine cranking · House power · Bluetooth · Group 31
12V 172Ah Marine Cranking Lithium Battery | Epoch Dual Purpose
Upgrade your boat with a 12V 172Ah marine cranking lithium battery that combines outboard starting power and deep-cycle house energy in one compact Group 31 LiFePO4 platform.
The Epoch Dual Purpose LiFePO4 battery delivers 2.20kWh of marine lithium battery storage, a 1,000A 5-second cranking pulse, 200A continuous output, Bluetooth monitoring, IP65 dust-tight, water-jet-resistant protection, and a lightweight 40-lb design for anglers and boaters who want fewer batteries, less weight, and more confidence on the water.
172Ah
Capacity
2.20kWh
Stored energy
1,000A
5-sec cranking pulse
200A
Continuous output
40 lb
Battery weight
IP65
Marine enclosure
Built to go further
Dual purpose designCranking + deep-cycle power
Approx. 1,000 CCAOutboard starting support
Bluetooth monitoringiOS and Android app visibility
IP65 protectionDust and water-jet resistance
4,000+ cyclesLong-cycle LiFePO4 chemistry
11-year warrantyManufacturer coverage
The Ultimate All-in-One Boat Battery: Core Features
Replace separate starting and house batteries with one cranking-capable, deep-cycle Group 31 lithium battery.
Cranking power: approx. 1,000 CCA equivalent
A heavy-duty cranking BMS delivers 1,000A for up to 5 seconds, for engine cranking only, giving compatible outboard starting systems the burst current they need without using a separate lead-acid starting battery.
Deep-cycle house power with 200A continuous output
This 2.20kWh marine lithium battery also supports long-running 12V loads including fish finders, livewell pumps, bilge pumps, lighting, radios, GPS units, stereos, and other onboard electronics.
Drop the dead weight at only 40 lbs
Replace heavy lead-acid starting and house batteries with one 40-lb Group 31 lithium battery to reduce boat weight, improve service access, and free up crowded battery compartments.
Built to Survive Demanding Marine Environments
Group 31 fitment, IP65 protection, and Bluetooth visibility for boaters who need dependable power.
BCI Group 31 footprint
The compact case measures 12.91 in L × 6.22 in W × 8.46 in H (328 × 158 × 215 mm) on a BCI Group 31 footprint, for compatible marine trays, hatches, and center-console compartments. It is not a drop-in replacement for every lead-acid installation: check tray fit, terminal clearance, cable size, overcurrent protection, and the charger profile first.
IP65 dust-tight, water-jet resistant
The IP65 enclosure is dust-tight and protects the internal cells and smart BMS against low-pressure water jets from any direction in marine battery hatches and boat compartments. It is not submersible: do not submerge or pressure-wash it, or install it where standing water can collect, such as a bilge.
Bluetooth smart app monitoring
Use the Epoch Li-Ion app to check battery state of charge, voltage, current, temperature, and BMS status from your phone, so you can see how much power remains before you run back to the ramp.
Expandability & 11-Year Reliability
Build a larger 12V house bank without moving away from the cranking-capable dual-purpose platform.
Expand your 12V house bank up to 4 in parallel
Wire up to 4 matched batteries in parallel for a 12V 688Ah / 8.81kWh bank. Series wiring is not approved for this model unless Epoch provides written model-specific guidance.
4,000+ cycles and 11-year warranty
LiFePO4 chemistry provides long service life, stable voltage, fast charging capability, and maintenance-free operation backed by Epoch’s 11-year manufacturer warranty (register within 90 days of purchase).
Smart BMS protection
The built-in BMS helps protect against overcharge, over-discharge, over-current, short circuit, high temperature, low temperature, and low-temperature charging conditions.
Built for Marine Anglers, Boaters & 12V Power Systems
An all-in-one boat battery for cranking, electronics, and deep-cycle marine runtime.
- ✓Marine cranking and starting applications where the outboard requirements match.
- ✓Epoch’s compatibility target is outboards up to 250 hp when the engine’s battery requirements, alternator output, wiring, and charging profile match.
- ✓All-in-one boat battery setups that combine starting power and house electronics.
- ✓Bass boats, fishing boats, pontoons, skiffs, flats boats, and center-console systems.
- ✓Fish finders, livewell pumps, bilge pumps, GPS, marine radios, lighting, and onboard electronics.
- ✓Group 31 AGM or lead-acid replacement projects where fitment and charging profile match.
- ✓12V marine house banks up to 688Ah using matched batteries in parallel.
- ✓RV, camper, van, and solar 12V deep-cycle systems where cranking capability is also useful.
Technical Specifications
Clean reference specs for the Epoch 12V 172Ah Essential Series dual-purpose marine lithium battery.
| General | |
|---|---|
| Brand | Epoch Batteries |
| Model / SKU | 12172A-DP |
| Series | Essential Series |
| Battery type | Dual-purpose cranking and deep-cycle LiFePO4 battery |
| Battery group size | Group 31 |
| Chemistry | LiFePO4 / lithium iron phosphate |
| Cell type | Prismatic LiFePO4 |
| Cell configuration | 4S1P |
| Bluetooth | Yes — Epoch Li-Ion app, iOS and Android |
| Self-heating | No |
| Cycle life | 4,000+ cycles |
| Warranty | 11-year manufacturer warranty |
| Voltage and capacity | |
| Nominal voltage | 12.8V |
| Nominal capacity | 172Ah |
| Stored energy | 2.20kWh (2,202Wh, nominal) |
| Operating voltage range | 10.0V – 14.6V |
| Maximum charge input | 15.0V maximum input rating — not a charger target (charge at 14.2V – 14.6V) |
| Current ratings | |
| Max continuous discharge | 200A |
| Max continuous charge current | 200A, all charging sources combined |
| Peak discharge / cranking | 1,000A for up to 5 seconds, cranking only |
| Cranking capability | Approx. 1,000 CCA equivalent |
| Series / parallel | Parallel only, max. 4 matched batteries (4P: 688Ah, 8.81kWh at 12.8V); series wiring is not approved for this model |
| Temperature | |
| Charge temperature range | -5°C to 55°C / 23°F to 131°F (battery rating); program chargers for 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 |
| Low-temperature charge protection | Yes; the BMS blocks charging when the battery is too cold (no internal heating) |
| Dimensions and mechanical | |
| Overall dimensions | 12.91 in L × 6.22 in W × 8.46 in H |
| Metric dimensions | 328 × 158 × 215 mm |
| Weight | 40 lb / 18.14 kg |
| Terminal type | M8 female; torque 8–12 Nm (71–106 in-lb) |
| Case material | ABS and PC blend |
| Flame rating | UL94-V0 |
| Enclosure protection | IP65 (IEC 60529): dust-tight, water-jet resistant; not submersible |
| Recommended charging settings | |
| Bulk / absorption voltage | 14.2V – 14.6V |
| Absorption end condition | End when current falls to C/20 (about 8.6A) or after 15 minutes, whichever comes first |
| Float voltage | 13.4V – 13.8V, or disabled (preferred where the charger supports it) |
| Re-bulk voltage | 13.2V |
| Equalization | Disabled |
| Temperature compensation | 0 mV/°C (disabled) |
| Recommended charge current | Up to 86A (0.5C, 50% of capacity) for one battery; up to 50% of bank capacity for parallel banks |
| BMS high-voltage cutoff | 14.6V |
| SOC recalibration voltage | 14.6V |
| BMS protection and compliance | |
| BMS | Smart BMS with built-in battery management |
| Protections | Overcharge, over-discharge, over-current, short circuit, high temperature, low temperature, and low-temperature charge protection |
| Cell certification | UL 1642 (cells) |
| Thermal runaway testing | UL 9540A (cells) |
| Battery certification | IEC 62619:2022 |
| Compliance | CE, RoHS |
| Shipping classification | UN 38.3, Class 9 |
IP65 marine protection
Dust-tight. Water-jet resistant. Not submersible.
The IP65-rated enclosure is dust-tight and protected against low-pressure water jets from any direction. It is suitable for many marine battery hatches and center-console installations, but it should not be submerged, pressure-washed, or installed where standing water can collect around the battery.
Why upgrade to Epoch dual-purpose lithium?
Start the engine, run the electronics, and remove unnecessary lead-acid weight.
This Epoch Dual Purpose LiFePO4 battery lets boaters consolidate cranking and deep-cycle power into a lighter, smarter, maintenance-free lithium platform. Compared with traditional lead-acid setups, it reduces watering, corrosion maintenance, wasted compartment space, and voltage sag under long accessory loads.
Fitment, Charging & Installation Note
Verify your exact boat, charger, alternator, and electrical system before installation.
Confirm Group 31 tray dimensions, lid clearance, hold-down method, terminal hardware, cable routing, fuse/breaker ratings, charger programming, and outboard alternator compatibility before installation. Mount the battery upright, and place a DC-rated main fuse or breaker as close as practical to the positive terminal, sized for engine cranking current as well as house loads. Use LiFePO4-compatible charging settings and follow Epoch’s current manual, applicable marine codes, and qualified installer guidance for final wiring.
Frequently Asked Questions
Common questions about cranking, house power, fitment, charging, and marine lithium safety.
Can this lithium battery really start a gas outboard motor?
Yes. Unlike standard deep-cycle lithium batteries that may shut down under engine-starting loads, the Epoch 12V 172Ah Dual Purpose battery uses a cranking-capable BMS and is rated for 1,000A for up to 5 seconds, for engine cranking only; Epoch lists it as approx. 1,000 CCA equivalent, based on that 5-second rating. Epoch’s compatibility target is outboards up to 250 hp when the engine manufacturer’s battery requirements, alternator output, wiring, and charging profile match.
Can I use this battery for both my outboard motor and my house electronics?
Yes. That is the purpose of this dual-purpose design. The battery can provide high-output cranking power for a compatible outboard while also delivering 172Ah / 2.20kWh of deep-cycle capacity for fish finders, GPS, livewell pumps, bilge pumps, lighting, stereos, radios, and other 12V marine electronics. Keep the accessory loads within the 200A continuous rating, and do not discharge the battery so deeply that there is not enough charge left to start the engine.
Will this fit in my boat's current battery tray?
The Epoch 12V 172Ah Dual Purpose battery is built on a BCI Group 31 footprint and measures 12.91 in L x 6.22 in W x 8.46 in H (328 x 158 x 215 mm). It is not a drop-in replacement for every lead-acid installation, so always verify tray size, lid clearance, cable routing, terminal access, and hold-down hardware before installation, and leave clearance above the terminals for cable bend radius and terminal covers.
Can I connect these batteries in series for a 24V or 36V trolling motor?
No. This model is not approved for series wiring. Series wiring increases voltage and may exceed the battery’s design limits, so it should not be wired in series to create 24V, 36V, or 48V systems unless Epoch provides written model-specific approval. It can be wired with up to 4 matched batteries in parallel for a larger 12V bank up to 688Ah (8.81kWh).
Can I install the battery in a bilge or an open deck compartment?
The battery has an IP65 enclosure rating: it is dust-tight and protected against low-pressure water jets from any direction. It suits many marine battery hatches and center-console compartments, but it is not submersible: do not install it in a bilge or anywhere standing water can collect around the case or terminals, and do not submerge or pressure-wash it. Keep it out of prolonged direct sunlight and away from engine and exhaust heat.
How do I check the battery level while I'm on the water?
This battery includes Bluetooth monitoring through the free Epoch Li-Ion app for iOS and Android. From your phone, you can review state of charge, voltage, current flow, temperature, and BMS status and protection events while you are at the helm or rigging area.
Can my outboard motor's alternator charge this lithium battery?
The battery can accept up to 200A of charge current, so confirm the alternator’s temperature, duty cycle, and output limits, and verify that your outboard alternator and charging system are compatible with LiFePO4 batteries. Some systems may require a lithium-ready regulator, a marine DC-to-DC charger, or manufacturer-specific guidance to protect the alternator and charge the battery correctly.
Does this battery have built-in heating?
No. This specific 12V 172Ah Dual Purpose Essential Series model does not include internal self-heating. It does include low-temperature charge protection: the battery is rated to charge from 23°F to 131°F / -5°C to 55°C, but chargers should be programmed to charge only between 32°F and 131°F / 0°C and 55°C, and the BMS blocks charging when the battery is too cold. It can still discharge down to -4°F / -20°C.
More from Essential Series
12V 105Ah Essential Series LiFePO4 Battery (1.34kWh)
163
$54912V 105Ah
12V 300Ah Essential Series LiFePO4 Battery (3.84kWh)
230
$1,24912V 300Ah
12V 50Ah Essential Series LiFePO4 Battery (0.64kWh)
37
$29912V 50Ah
12V 460Ah Essential Series LiFePO4 Battery (5.89kWh)
157
$1,59912V 460Ah
36V 50Ah Essential Series LiFePO4 Battery (1.92kWh)
7
$74936V 50Ah
12V 334Ah MC Essential Series LiFePO4 Battery (4.28kWh)
3
$1,29912V 334Ah
24V 230Ah Essential Series LiFePO4 Battery (5.89kWh)
$1,59924V 230Ah
12V 334Ah Essential Series LiFePO4 Battery (4.28kWh)
3
$1,29912V 334Ah
48V 125Ah Essential Series LiFePO4 Battery (6.4kWh)
$2,19948V 125Ah
Additional Resources
Safety certifications & listings
Every mark below is a standard this battery has been tested against or a listing it carries. Here is what each one covers, in plain English.
IP65
Ingress protection
Dust-tight, and protected against water jets from any direction. Under IEC 60529 the first digit rates solids and the second rates water.
- Sealed against dust and dirt
- Rain, spray and hose-down
- Outdoor and marine mounting
IEC 60529, Degrees of protection provided by enclosures
UL 1642
Lithium cell safety
The UL standard for lithium cells. Each cell design is tested for fire and explosion risk under abuse before it is built into a pack.
- Short-circuit and overcharge
- Crush, impact and shock
- Heating and temperature cycling
UL 1642, Lithium batteries
UL 9540A
Thermal runaway testing
A UL test method that measures how a cell behaves if it goes into thermal runaway, and whether fire can spread to its neighbours. The data is used to design safer energy storage systems.
- Cell-level thermal runaway data
- Fire propagation assessment
- Heat and gas release measured
UL 9540A, Test method for evaluating thermal runaway fire propagation in battery energy storage systems
IEC 62619
Industrial battery safety
The international safety standard for rechargeable lithium cells and batteries in industrial use, including stationary energy storage.
- Electrical and mechanical abuse
- Thermal runaway propagation
- Battery management functional safety
IEC 62619, Safety requirements for secondary lithium cells and batteries for use in industrial applications
CE
EU conformity
The manufacturer's declaration that the product meets the European Union's health, safety and environmental requirements, which is required to sell it in the European Economic Area.
- Applicable EU safety directives
- Electromagnetic compatibility
- Environmental requirements
CE marking, EU declaration of conformity
RoHS
Hazardous substances
Complies with the EU Restriction of Hazardous Substances directive, which limits lead, mercury, cadmium and other toxic materials in electronics.
- Lead, mercury and cadmium below limits
- Restricted flame retardants and phthalates
- Safer to handle and recycle
Directive 2011/65/EU, Restriction of hazardous substances
UN 38.3
Transport safety
The United Nations test series every lithium battery must pass before it can be shipped by air, sea or road.
- Altitude, thermal and vibration tests
- Shock, external short-circuit and impact
- Overcharge and forced discharge
UN Manual of Tests and Criteria, Part III, sub-section 38.3
Reviews
Recent reviews
Very nice looking battery
I installed this in a 2007 Winnebago View, upgraded all the appropriate wiring added a Victron DC to DC charger a Victron MPPT controller for the solar panels and a house 2start chassis battery trickle charger. The new Epoch battery replaces two AGM‘s in the space of just a little more than one AGM battery. Everything seems to be working well have not taken…
Great upgrade
I'm running this as my only house battery on my boat. It handles running two 12" graphs and a livewell pump with an oxygenator for a full day on the water, and plenty of power left to start my 250 Yamaha. That plus the weight savings over lead acid makes it a great upgrade.