BigBattery HUSKY 2 12V 400Ah (INV)

SKU FHSKY-12051-G2-INV

The BigBattery HUSKY 2 12V 400Ah (INV) is a battery pack with a nominal voltage of 12.8V, a nominal capacity of 400 Ah, 5.12 kWh of energy, M8, a continuous discharge of 250 A, a peak of 500 A (Max 3 seconds) and 5120W of output.

Last updated: 10 October 2026

Battery and charging

Charging voltage range: 13.9V - 14V
Maximum charge voltage: 14.4 V maximum, charging 13.9-14 V
Communications bus: CANBus / RS485
Voltage: 12.8V
Rated charge cycles: 3,500 to 5,000 cycles (stated for LiFePO4 generally)
Cell arrangement: 4S
Nominal capacity: 400 Ah
Maximum continuous discharge: 250 A continuous, 500 A for 3 s
Peak discharge: 500A (Max 3 seconds)
Series and parallel limit: Up to (16) Parallel
Highest charge current it will take: 200A
Continuous output power: 5120W
Stated energy: 5.12 kWh
Charging voltage: 14.25V
Float voltage: 13.75V
Working voltage range: 12V - 14.4V

Battery care and safety

Where its BMS cuts off: 10.5V - 11.75V
Suggested low-voltage cut-off: 12V - 12.7V
Ingress protection: IP65 / NEMA 4X
Temperatures it may be charged in: -4ºF - 113ºF
Temperatures it may be run in: -4ºF - 131ºF
Temperatures it may be stored in: -4ºF - 113ºF
Heating built into the battery: Yes

Size and fit

Overall dimensions: 12.6 x 18.1 x 9.8 in (320 x 460 x 249 mm)
Stated weight: 100 lbs (45.4 kg)
Terminal thread: M8
Which way up it may be fitted: positioned on any of its sides except with the top side facing downward
Series and parallel connection: not series capable

Compatibility

What the manufacturer says it fits: RVs, marine systems, vans, and small off-grid applications

Identity

Model code: FHSKY-12051-G2-INV

How this brand publishes

Which revision of the document these figures were read from: 05/01/2025

Other findings

Communication port pinout: Pins 1, 2, 7, 8 RS485; pins 4 and 5 CAN; 3 and 6 unused
Configuration app: "BigBattery Husky 2", iOS and Android
Inverter configuration: Bluetooth sets ID and protocol; otherwise a lead-acid profile
Maximum parallel units: Up to (16) Parallel
Module id addressing: Master is ID 1 and connects to the inverter; slaves ascend
Optimal discharge temperature range: 59ºF - 95ºF
Parallel matching condition: at the same voltage
Prohibited applications: not meant for mobility systems
Self heating behaviour: Heats to above 0°C first, then charges
Storage maintenance charge: 14V at 50A CC/CV, stopping at 5A; every 9, 6 or 3 months
Storage state of charge: At least 50%, and a full pack taken down to 80% first
Supported inverters: Victron Only

Devices documented to run on this

The figures below line up. Neither manufacturer states that this pack runs this device — that is our reading of what each of them published separately, not a claim by either of them or a test by us. Even where every stated figure agrees, these can still decide it:

The device’s published draw is usually a peak, not the load it holds — the two numbers are not the same kind of quantity
A maker’s amp-hour minimum and their reserve-capacity minimum can give different answers about the same battery
Conditions attached to the chemistry, such as a speed limit for running on lithium
Whether the pack may be wired in series at all, where the device needs 24 or 36 volts
The charger, which both makers put conditions on and neither supplies
Case size, hold-down and terminal type — fitting the space is not being secured in it

Worth confirming with the device's manufacturer or a dealer before buying.

Neither company names the other and nobody has tested the pairing.

Compared on continuous figures only: nothing here is about surge.

Source: forestriverinc.com/files/component-manuals/Electrical/Progressive Dynamics - Inverter Model PD1600 Series Operation Guide.pdf

Minn Kota Terrova 55 lb (54" shaft, wireless remote)Figures comparedView device: Minn Kota Terrova 55 lb (54" shaft, wireless remote) →
One of these, on its own, at 12 V.
Only at 12 volts, and on published figures — neither maker has named the other and nobody has tested this pairing — check yours before buying.
Minn Kota ask for “at least a 105 amp-hour rating”, in a paragraph about lead-acid: “The motor will operate with any lead acid, deep cycle marine 12-volt battery/batteries. For best results, use a deep cycle, marine battery with at least a 105 amp-hour rating.” This pack is LiFePO4. For a lithium pack the same maker's thrust-to-capacity table names a different figure for this motor: “55 lb AGM or Lithium 100Ah 2–4 hours Most common setup” Those are two of Minn Kota's own numbers for two different chemistries, and an amp-hour rating does not carry from one to the other, so they are set out here rather than compared. This pack is rated 400 Ah. Minn Kota attach a condition to the chemistry that no comparison of figures can settle: "speeds higher than 85% for a prolonged period could cause permanent damage to the motor".
Source: johnsonoutdoors.widen.net/content/zp8zgjh29h/pdf/Terrova-BT-Installation-2327132rj.pdf
Source: minnkota.johnsonoutdoors.com/us/blog/selecting-best-trolling-motor-battery
Progressive Dynamics PD1620 Pure Sine Wave InverterFigures comparedView device: Progressive Dynamics PD1620 Pure Sine Wave Inverter →
BigBattery rate this pack at 250 A continuous — their datasheet reads "250A" — against the PD1620's published max current at max load of 200 A, leaving 50 A in hand at the inverter's full 2000 W.
Progressive Dynamics PD1618 Pure Sine Wave InverterFigures comparedView device: Progressive Dynamics PD1618 Pure Sine Wave Inverter →
BigBattery rate this pack at 250 A continuous — their datasheet reads "250A" — against the PD1618's published max current at max load of 180 A, leaving 70 A in hand at the inverter's full 1800 W.
Progressive Dynamics PD1610 Pure Sine Wave InverterFigures comparedView device: Progressive Dynamics PD1610 Pure Sine Wave Inverter →
BigBattery rate this pack at 250 A continuous — their datasheet reads "250A" — against the PD1610's published max current at max load of 100 A, leaving 150 A in hand at the inverter's full 1000 W.

Sources

BigBattery — HUSKY 2 12V 400Ah (INV)Manufacturer battery page
BigBattery
Source: bigbattery.com/products/12v-husky-2-lifepo4-400ah-5-12kwh
Retrieved September 15, 2026
Progressive Dynamics PD1600 Series Operation GuideManufacturer document
Progressive Dynamics
Source: forestriverinc.com/files/component-manuals/Electrical/Progressive Dynamics - Inverter Model PD1600 Series Operation Guide.pdf
Retrieved September 20, 2026
Archived document
Source: bigbattery.com/wp-content/uploads/2026/05/5-1-26HUSKY2-INV-Inverter-Version-SpecSheet.pdf
Retrieved September 15, 2026
Archived document
Source: bigbattery.com/wp-content/uploads/2025/06/HUSKY-2-USER-MANUAL-1.8-Inverter-Version.pdf
Retrieved September 15, 2026