Battle Born Batteries Lithium Battery Isolation Manager — Compact Inline Relay with Automatic Voltage Sensing for RVs & Boats

Battle Born Batteries' Lithium Battery Isolation Manager is a compact smart relay that automatically manages charging and isolation between multiple lithium battery banks to protect batteries and simplify power flow.

Designed for mobile power systems in RVs, boats, vans and off-grid setups, this isolation manager coordinates charge distribution so your auxiliary lithium battery is charged when the engine or shore power is available and isolated when it isn’t. It offers a simpler, lower-footprint alternative to bulky battery isolators or complex BMS wiring, helping protect your lithium pack from improper charging sources while keeping starter and house circuits separated.

How does the Isolation Manager protect my lithium battery during charging?

The unit senses charge voltage and only connects battery banks under safe conditions, preventing over-discharge and avoiding inappropriate charging sources. Rather than constantly tying batteries together, it closes the circuit when the alternator or charger provides a healthy charge, then opens it when voltage falls or the engine stops.

• Automatic voltage sensing to enable or disable charging connection
• Prevents backfeeding into starter or house circuits when off
• Reduces parasitic loads and limits unintended discharge paths

Can I install the Isolation Manager in my RV or boat without changing wiring a lot?

Yes — the device is engineered for straightforward inline installation between two battery banks and typical charging sources. Most installations require mounting the unit in a dry, ventilated location and connecting positive leads; it integrates with alternators, DC chargers, and inverter chargers without complex rewiring.

• Compact form factor for tight compartments or panels
• Simple positive cable routing between house and start batteries
• Compatible with common alternator and charger voltage ranges

What protections and controls does it offer during operation?

The manager includes logic to avoid repeated cycling, safeguards against connecting under low-voltage conditions, and a solid-state or relay switching mechanism suited to lithium chemistry. These features extend service life of both batteries and charging equipment by ensuring connections occur only when appropriate.

• Timed delays to prevent rapid on/off switching
• Voltage thresholds tuned for lithium battery charging behavior
• Robust switching components sized for typical alternator currents

How will this change my day-to-day power usage while traveling?

Once installed, the Isolation Manager runs automatically and requires little to no user interaction, making power management more predictable on the road. You’ll spend less time manually isolating batteries, and more time using electrical appliances confidently, knowing charging occurs when available and isolation protects batteries when not.

• Hands-off operation—connects and disconnects automatically
• Improved reliability for starting and house systems
• Reduces need for manual switches or separate isolator devices

Who is this for: The Battle Born Batteries Lithium Battery Isolation Manager is intended for RVers, boaters, vanlifers and small off-grid system owners who use lithium battery banks and want a compact, automatic solution to control charging between starter and house batteries. It’s especially useful when you need dependable charge-sharing without complex BMS rewiring or bulky isolators, and for anyone who prefers a set-and-forget approach to multi-battery power management.