Quick Start Guide


Choose a location

Your battery should be installed within the living area of your campervan where it is less exposed to extreme temperatures, moisture or vibration. If possible, install your battery, inverter and chargers in the same area to keep cable lengths to a minimum. Fix the battery securely using brackets or ratchet straps bolted to the chassis.


Connect cables

Our batteries use M8 bolts so cables should be finished with copper tube terminals. When connecting cables to the battery, connect the positive lead first then the negative. If installing multiple batteries, you should charge them individually to 100% before fitting and link cables MUST be exactly the same size. Make sure all connections are tight.


Setup chargers

For safety reasons your battery will be shipped at a low state of charge so unless you intend to install straight away, you should charge your battery on arrival. Battery chargers should be configured with a LiFePO4 profile. We recommend a boost/absorption voltage of 14.2V and float voltage of 13.5V. Boost/absorption time should be 1 hour and equalisation mode should be disabled.


Install BMS app

Our SMART batteries can be monitored in real time using the free Roamer BMS app for iPhone or Android which can be downloaded from the App Store or Play Store. During installation, make sure you allow Bluetooth and GPS connections when prompted or you will not be able to connect (don't worry we do not collect your data). You can use the app to check state of charge, individual cell voltages, current and faults.


Precharge inverter

Roamer Batteries have surge protection built in so when connecting to a large inverter, this may disable charge and discharge (will show ASCD in the protection state menu of the Roamer app). To connect the inverter safely and without triggering BMS protection, you will need to ‘precharge the capacitors’ in your inverter by using a high power resistor or connecting a charge source or power supply to the inverter DC terminals. For more advice on how to do this please contact us.



The Roamer app allows you to check battery and cell status as well as monitor protection state. On the main page, the charge and discharge buttons should show as on and be highlighted in orange. If they are greyed out and show as off, check the details tab and the protection state page. This provides more info and a status code for what is going on. If you need further help, please contact the Roamer support team by emailing to support@roamer.com

Protect your battery

Best practice for long life

The internal BMS will protect your battery from extreme conditions such as very low voltages or below freezing temperatures. For normal day to day usage however, you can also preserve the life of your battery by following some simple best practise guidelines such as avoiding over charging or discharging, using lithium specific chargers, keeping at temperatures between 5 and 40 degrees and using a high quality inverter (pure sine wave, not modified).

Long term storage

If you’re not ready to install your battery or you won’t be using it for a while, we recommend charging to between 13.1V and 13.3V (30% and 80%) and then isolating from loads and chargers completely. It is not necessary to trickle/float charge as Roamer Batteries have a very low self-discharge rate of just 3% per month. You should also monitor your battery voltage and ensure it does not drop below 12.9V, if voltage drops low then you will need to charge again. You should cycle your battery every 6 months if storing for an extended period.

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