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The InSight 12V LT is a 120Ah powerhouse lithium battery that outputs 160A continuous and offers higher peak discharge. Built specifically to meet the power and energy requirements in RV and Marine deep-cycle applications, the InSight 12V battery is a game-changer delivering unmatched power and performance. With its higher continuous capabilities, you can run multiple appliances at the same time with just one battery. And it’s capable of 3200 watts for up to two minutes!

Featuring our Low Temperature Series (LT) technology, the InSight 12V battery can safely charge at temperatures down to -20°C (-4°F). The system features proprietary technology that draws power from the charger itself, requiring no additional components. The entire process of heating and charging is completely seamless. It's a perfect solution for those who are still using lead-acid batteries in low-temperature environments.

The GC2-sized InSight 12V batteries are drop-in ready and easy to install, just connect them in parallel for the capacity you need. No need to modify trays, no complicated connections, and no heavy lifting. They’re also scalable, so you can provide increased power and energy as needed. InSight batteries are connected in parallel which means you have the freedom and flexibility to use the right amount of batteries for your setup.

InSight batteries also feature an intelligent BMS that provides precision balancing within a battery and between batteries in a parallel system without the need for charging batteries individually. In addition, our proprietary software determines and manages regenerative currents – unlike any other battery solution - avoiding unnecessary battery disconnects.

With InSight, you get unmatched quality and performance, from the inside out. It’s the only lithium battery like it on the market today!

  • Voltage: 12.8V
  • Amp Hours: 120Ah
  • Length: 10.2 in (260 mm)
  • Width: 7.1 in (180 mm)
  • Height: 10.9 in (276 mm)
  • Weight: 34.4 lbs (15.6 kg)
  • Marine
  • Recreational Vehicles
  • Solar


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Functional Specifications

Nominal Voltage 12.8V
Cell Chemistry LiFePO4
Cell Type Prismatic
Ampere-hour Capacity 120Ah
Watthour Capacity 1.536kWh
Specific Energy 128Wh/kg
Charge Efficiency 99%
Impedance (50% SOC, 1kHz) <100mΩ
Cycles @ 80% DOD >3500
Parallel Capable Yes (unlimited)
Series Capable No (max 12V system)

Mechanical Specifications

BCI Size GC2 / GC8
Dimensions (LxWxH) 10.2 x 7.1 x 10.9 in (260 x 180 x 276mm)
Weight 34.4 lbs (15.6 kg)
Case Material ABS
Stud Terminal M8 X 1.25 - 20
Insert Terminal M8 X 1.25 - 20
Torque 79.7-88.5 in-lbs. 6.6 - 7.4 ft-lbs. 9-10 N-m
Handles Molded
Ingress Protection Marking IP67
Case Flame Rating UL94 V-0

Discharge Specifications

Continuous Discharge Current 160A
Peak Discharge Current - 1 175A - 5 min
Peak Discharge Current - 2 250A - 2 min
Peak Discharge Current - 3 350A - 15 sec
Peak Discharge Current - 4 400A - 5 sec
Short Circuit Protection 3000A - 300 μsec
Protection Recover Automatic
Low Voltage Disconnect 10V - 5 sec (2.5vpc)
Low Voltage Reconnect Automatic
Self-Discharge perMonth @ 25°C in OFF mode 2.80%

Charge Specifications

Recommended Charging Current 10-60A
Disconnect Charge Current - 1 100A - 5 sec
Disconnect Charge Current - 2 120A - 0.5 sec
Recommended Charge Voltage 14.4-14.6V
Float Voltage 13.8V
High Voltage Disconnect 14.8V -4 sec (3.7vpc)
High Voltage Reconnect Automatic
Temperature Compensation None
Heating Element Power 50W
Heating Rate 5⁰C/hr

Environmental Specifications

Charge Temperature 32°F to 113°F (0°C to 45°C)
Discharge Temperature -4°F to 149°F (-20°C to 65°C)
Operating Humidity <90% RH
Storage Temperature 50°F to 95°F (10°C to 35°C)
Storage Humidity 25 to 85% RH


UL1973 (Battery Pack) File Number: PENDING
CE (Battery Pack)
IEC 62133 (Battery Pack) PENDING
UN38.3 (Battery Pack)

Shipping Classification

UN 3480, Class 9



How to Read RELiON's Data Sheets

We know that Data Sheets can sometimes be confusing, overwhelming, or difficult to decipher. In this Tech Video, one of our experts breaks down how to easily read our Data Sheets.

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With warmer weather here, the new InSight 12V lithium battery offers boat and RV owners the ability to power multiple appliances for longer while off-the-grid.

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Remote Possibilities

"When we bought our first truck camper, we were really excited to take it on a long trip down Mexico’s Baja peninsula. The camper was perfect in most ways. It had a comfy bed, ample living space for us and our big dog, and even a shower. One thing it did not have was lithium-ion batteries.

In Baja, you explore remote beaches and wild camp on the coast a lot (that’s kind of the point of going). If we kept the lead acid batteries, we would have to lug along a heavy, noisy generator and gas can to meet our electrical needs. These days there are several devices and appliances we enjoy and depend on heavily while traveling, i.e computers, tablets, WiFi, TV / monitor, Instant Pot, Nespresso, etc. Space is at a premium in a truck camper and we have to be mindful to maximize every square inch. Two RELiON InSight 12V lithium batteries sized the same as the lead acid alternatives (GC2) would double our usable capacity (240ah) and weigh almost half as much (70lbs). We also wanted to cook with electricity and rely less on propane, which is a nonrenewable resource and can be hard to find especially in remote, rural Baja. So we knew we needed the high efficiency and robust performance of lithium batteries combined with several hundred watts of solar panels and a DC/DC charger."

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InSight Series 12V Fuel Gauge


RELiON’s backlit InSight Fuel Gauge is a plug-and-play accessory that provides real-time State of Charge (SOC) for your InSight batteries. It’s seamless to install and makes it incredibly easy for you to determine when it's time to charge your batteries.

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In Sight 12 V Callout

InSight 12V Quick Installation Guide

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Frequently Asked Questions

Can InSight batteries be connected in parallel or series?
RELiON’s InSight batteries were designed exclusively to run in parallel. For starters, each InSight 12V battery is 12 volts. Up to 10 Insight batteries can be connected in parallel, giving you up to 1200 amp-hours. Because they are in parallel, if any one battery goes offline, you will not notice any difference in performance, only duration. A parallel connection extends the reliability of each individual Insight battery to the entire array, giving you more power, more capacity, and less to worry about.
How does the heating element work?
The battery management system monitors the internal temperature of the battery. If the temperature drops below 32°F (0°C) and a charge cycle is initiated, the BMS will divert charge current to the heating element until the uniform internal temperature of the battery is safe for charging. The specific safe charging temperature differs. For small batteries it's 50°F (10°C), for larger batteries it's 41°F (5°C). See individual data sheets for details.
How long does the heating element take to warm the battery to a safe temperature?
Depending on how cold it is and which model of battery, the BMS will divert 5-15 amps of charge current to the heating element. The heating rate for the InSight 12V battery is 5⁰C per hour.
Does the heating element keep the battery warm during discharging also?
No, during discharge the heating element remains off. The battery will function according to the discharge voltage characteristics at various temperatures chart. It is perfectly safe to discharge in temps down to -4°F (-20°C).
How many amps does the heating element draw?
Depending on battery model, the BMS diverts 5-15 amps to power the heating element.
How can I determine the state of charge (SOC) of my InSight battery?
We recommend using a shunt-based fuel gauge to measure SOC with the InSight Battery. This type of fuel gauge accurately measures the discharge/recharge currents and calculates the Ampere-hours (Ah) flowing in and out of the battery. The LEDs on the battery will also indicate the SOC: 95% - 100% Solid Green Solid Green 75% - 95% Solid Green Flashing Green (every ½ sec.) 50% - 75% Solid Green Solid Yellow 30% - 50% Solid Green Flashing Yellow (every ½ sec.) 10% - 30% Solid Green Solid Red 0 - 10% Solid Green Flashing Red (every ½ sec.)
What’s a BMS and what makes InSight’s “SuperSmart”?
RELiON’s batteries are all equipped with an internal Battery Management System which protects against potentially damaging circumstances. The conditions the BMS monitors include over-voltage, under-voltage, over-current, over-temperature, short circuit, and cell imbalance. The BMS will disconnect the battery from the circuit if any of these events occur. InSight’s BMS provides precision balancing within a single battery and between batteries in a parallel system without the need for charging batteries individually. InSight’s BMS is constantly updating, so it grows more accurate and stays accurate over the life of the battery. The InSight BMS features a four-layer circuit board measuring 5.75” x 8.625” with an additional heat sink included. The InSight battery features a combined total of 48 charge and discharge metal oxide semiconductor field-effect transistors (MOSFETs) that control current flow in and out of the battery.
How do I charge InSight batteries?
It is best to use/select a Lithium, AGM or GEL charge profile in that order of availability. Consult your manual or charger manufacturer for directions on this capability. Spot check the battery SOC LED indicators with a quick press and release of the battery Power Button. Chargers typically display a solid Green Light when the charge is completed, and a flashing green light when the battery is near the end of charge (will vary by charger). Both conditions may or may not occur depending on your charger design. Neither condition is necessarily required to properly achieve a full recharge.
Is there a way to turn the batteries on and off without accessing the battery compartment?
The InSight Series Remote Button gives you the convenience to power on and off your InSight Series batteries without having to access the battery compartment. This high-quality plug-and-play accessory saves you time and energy.
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