HELP! How to safely “wake up” your lithium battery from “safe mode”

lithium battery in safe mode

The technology and long term return on your investment is making lithium batteries more popular than ever but are they too smart for our own good?

What is Lithium “safe mode”

One of the cool features of modern lithium batteries is the in-built BMS (battery management system). Depending on the brand of battery you chose the BMS does a wide range of cool functions to protect and condition your lithium battery.

One feature of nearly every BMS is the safe mode. This feature disconnects your battery from complete discharge if you take your battery too low.

Portable lithium systems with redarc

Why isn’t my lithium charger working?

When your lithium battery drops into safe mode it disconnects power to the battery terminals, this is great for protecting the battery from a complete discharge. You may expect your charger to recovery the battery but modern 240V chargers however DC Chargers and regulators need to see a battery before they will fire up. This is an in-built safety feature.

When your battery BMS disconnects, there is no voltage and therefore your chargers will not kick in. Now we have a “chicken and the egg” situation. Your battery needs charger but your charger can’t see the battery.

How do I “wake up” a lithium battery in safe mode?

To re-activate the lithium battery you need a constant voltage across your terminals above 12V. People have been known to do this with jumper cables and home made leads that connect their car to the battery. This will work but is risky as it can cause damage to appliances and your battery if something goes wrong.


At a stable 12.7V and 10amps of charge the JTS Lithium stabiliser is a safe and smart way to wake up your lithium battery bank.

A safe alternative to wake up your lithium battery

The JTS Voltage stabiliser is a stable 12.7V 10amp DC Charger that does not rely on sensing a battery to activate. This creates a stable 12V for your lithium battery giving the BMS a safe enviroment to reconnect the lithium cells.

Once the BMS has reactivated your DC charger, solar regulator or 240V charger will take over giving your lithium system the full charge it needs.

    240V Re-Set Option:

    To reset your lithium battery when you have access to 240V mains power the JTS L100 240V charger is a great option. This unit supplys up to 7amps with an Anderson plug on one end for easy fitment. It can also be used as a home power supply for your 12V fridge and many other 12V accessories.

    12V DC Charger – Anderson plugs

    The 12V Lithium rest option is ptobably to most effective as it allows you to safely wakeup your lithium system while offgrid. This unit cames with 2 Anderson plugs fitted for easy connection. You can either hard wire the unit or use it inline.

    Pre Wired CIG Lithium DC Charger

    Pre-wired so you can re-set your lithium battery from your cars cig socket this is the easiest way to wake up your lithium battery from safemode.

    A Phone Call Away

    The team at JTS are just a phone call away. If you have any questions about this article, another 12V challenge or a question about setting up your rig then give the team a call.

    07 5445 5930


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    Hard Korr + Redarc Lithium Combo Kits

    Intervolt Hard KORR 100Ah DC Charger Combo

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    Hard Korr + Redarc Lithium Combo Kits

    Hard Korr 200Ah Manager 30 combo