Skip to content
Contact Us Price Match Guarantee FAQs Why Buy From Us About Us Customer Reviews Installer Program Build Your System
BigBattery 12V HUSKY 2 5.12kWh 400Ah LiFePO4 Battery

BigBattery 12V HUSKY 2 5.12kWh 400Ah LiFePO4 Battery
Save 29% Save 29%
$2,050.00
$2,050.00 - $2,050.00
$2,050.00
$1,450.00
$1,450.00 - $1,450.00
$1,450.00
✓ Authorized BigBattery Dealer
✓ Lowest Price Match Guarantee
✓ FAST & FREE Shipping: ETA Mid October
✓ Questions? Talk to a BigBattery Expert: 303-876-7654
✓ Price Match Gaurantee

Login for Exclusive Member Pricing.
Not a member? Create a Free Account.

12V · 400Ah · 5.12kWh

BigBattery 12V HUSKY 2 5.12kWh 400Ah LiFePO4 Battery

The 12V HUSKY 2 delivers 400Ah / 5.12kWh with built-in self-heating for cold-weather charging, sealed in an IP65 / NEMA 4X enclosure for RVs, camper vans, and commercial vehicles.

This is the INV version, with inverter communication included. It communicates over CANBus/RS485 and can be paralleled with up to 16 total units as your system grows.

BigBattery 12V HUSKY 2 5.12kWh 400Ah LiFePO4 Battery
12-Year Warranty*
Lowest Price Guarantee
Authorized BigBattery Dealer
Free Shipping
0% APR Financing
Expert Support: (303) 876-7654

Why the HUSKY 2

5.12kWh, Self-Heating for Cold Weather

Built-in self-heating lets this battery accept a charge in cold conditions that would shut a non-heated LiFePO4 pack's charging down entirely.

High Continuous and Peak Discharge

Sized to handle hard pulls and motor starts, not just steady-state draw, without tripping the BMS.

CANBus / RS485, Parallel Up to 16

Communicates over CANBus/RS485 and supports up to 16 units in parallel, so a system that starts with one HUSKY 2 can keep growing.

IP65 / NEMA 4X Sealed Enclosure

Sealed against dust and water intrusion for an engine bay, battery tray, or outdoor-adjacent install.

12-Year Warranty

BigBattery backs the HUSKY 2 with a 12-year warranty, well beyond a comparable lead-acid replacement's 2-3 years.

INV and PWR Terminal Options

Available with inverter communication (INV) or raw power terminals only (PWR), so you can match the version to what your system actually needs.

What's Included

What's included: BigBattery 12V HUSKY 2 5.12kWh 400Ah LiFePO4 Battery

What You Get

  • 1 × BigBattery 12V HUSKY 2 5.12kWh 400Ah LiFePO4 Battery
  • Ring terminal cables
  • Documentation

Full Specifications

Model BigBattery 12V HUSKY 2
Nominal Voltage 12.8V (12V system)
Capacity 400Ah / 5.12kWh
Battery Chemistry LiFePO4
Cycle Life Not published by BigBattery for this model
Continuous Discharge 250A / 5,120W
Peak Discharge 500A for 3 seconds
Max Charge Current 200A
Charge Temperature Range -4°F to 113°F (-20°C to 45°C)
Discharge Temperature Range -4°F to 131°F (-20°C to 55°C)
Weight 95 lb
Dimensions 18.1"W × 12.6"D × 9.8"H
Ingress Protection IP65 / NEMA 4X
Communication CANBus / RS485
Cell Configuration 4S
Max Parallel Up to 16 units
Warranty 12 years
Certifications Not published for this model

Authorized BigBattery Dealer

We sell genuine BigBattery products backed by BigBattery's own warranty.

Lowest Price Guarantee

Find it cheaper from another authorized dealer? Call (303) 876-7654 before you order.

Real Support, Not a Ticket Queue

Sizing a battery bank or system? Call (303) 876-7654 and talk to a person.

BigBattery 12V HUSKY 2 5.12kWh 400Ah LiFePO4 Battery: Frequently Asked Questions

What's the difference between the INV and PWR terminal versions?
INV models include the communication cable and protocol for talking to a compatible inverter in addition to parallel comms; PWR models ship with raw battery terminals and parallel communication only, without inverter comms.
Does this battery work in cold weather?
It has built-in self-heating, which lets it accept a charge in cold conditions that would otherwise shut a standard LiFePO4 battery's charging down.
Can I parallel this with HUSKY 2 batteries I already own?
Yes, up to 16 units total can be paralleled together over CANBus/RS485.
Is this in stock, or on backorder?
As of our last check, this model shows as available for backorder on BigBattery's own site, with an estimated ship window rather than being discontinued. Call (303) 876-7654 for the current lead time before you order.
Do you offer financing or price matching?
Yes. We offer 0% APR financing options through Affirm at checkout, and our Lowest Price Guarantee applies — if you find this product cheaper at another authorized BigBattery dealer, call us at (303) 876-7654 before you order and we'll take care of it.
Renewable Outdoors LLC BBB Business Review