12V 105ah LiFePO4

The Roamer 100SMART3 is the ultimate ‘drop in’ LiFePO4 leisure battery - complete with an internal Battery Management System (BMS) with Active Balancing and Bluetooth monitoring via the Roamer BMS app. The 200A continuous discharge rate and the ability to combine up to four batteries in series or parallel gives this battery total flexibility to increase capacity and power.

£540 £600

PREORDER – delivery date 15th July

Make 3 payments of £180.00. Klarna. No fees. Learn more
Capacity 105Ah at 12.8V
Up to 200A continuous
Active Balancing
Up to 4 in series/parallel
Grade A+ LiFePO4 cells
IP65 waterproof
Roamer Bluetooth App
Low temp protection

Easy 14 day returns

Not entirely satisfied? Send it back within 14 days for a money-back guarantee.

10 year warranty

That’s how much we believe in our product. A decade of powered adventures.

Ongoing support

We’re all about community. Reach out to us any time - we’re here to help.


Compact with twice the power

Our premium Grade A+ matched LiFePO4 cells provide incredible amounts of power for their size. They also ensure stable voltage throughout the charge and discharge curve with a long lifespan of up to 3500 cycles, at 80% depth of discharge.

The upgraded BMS will actively balance all internal cells and supports installation of up to four 100SMART3 batteries in series or parallel - with auto balancing for parallel connected batteries. It provides a complete range of protections including low temperature charging.

Highest quality for highest power

The Roamer 100SMART3 uses the highest quality matched Grade A+ cells and comes assembled with precision-engineered brackets, laser-welded cell connections, flexible copper busbars, and an IP65 waterproof case.

Maintaining excellent balance throughout its 15 year life expectancy, your Roamer will deliver stable, high power with every cycle. Our additional factory and warehouse testing processes ensure the highest possible quality and because we believe in our product, we back everything with a 10 year warranty.

To ensure maximum lifespan, every 100SMART3 comes with a state-of-the-art internal Battery Management System (BMS) with Active Balancing- developed specifically for Roamer to support high power off-grid living.

Discover more about our powerful 3rd Generation SMART Batteries.

Simple setup

Comprehensive power

Your adventure starts with your setup. And with Roamer, it’s quick and easy. Simply choose your battery location, attach the cables, configure your chargers, and download our Roamer BMS app for real-time monitoring. Uninterrupted power = uninterrupted adventure.

The power of the Roamer 100SMART3



iPhone charges from start to finish



Laptop charges from start to finish






Days of fridge power



Lord of the Rings viewings on TV



Minutes of hair drying



Hours of air conditioning



Pizzas in the airfryer 

5/5 average rating

“Fantastic service from start to finish and the post sale backup is second to none.”

Rob Landsman

My partner and I have had the pleasure of buying a battery from Roamer. Being new to the campervanning world we sometimes need all the help we can get, and the people at Roamer offer help and advice by the bucket load. Today we received help from the amazing Steve and then had a follow up call from Chris, two of the nicest people you could ever wish to speak to. We can't recommend Roamer highly enough. Their products are very well made and after sales service is second to none.

Rebecca Freear

Having had an A1 buying experience with the guys at Roamer batteries, we were confident to ask for help when needed. Steve spent ages on the phone, patiently going through settings on the charge controller and advising re apps and appliance energy usage. Chris called twice later to make sure we had got the information we needed. If only all companies were as caring and thorough as Roamer Batteries, they are a top class small British business!

Joseph Parker

First and foremost Roamer batteries “do what they say on the tin”. Having purchased batteries before that did not live up to their amp hour claims, this is a brand you can trust. Setting up an off grid system at home to avoid energy price increases was made a good deal easier by all the help and advice. You can always buy cheaper but I am not sure you will ever get better value for money when it comes to buying top quality batteries.

Graeme Kerr

The team at Roamer are fantastic. Seriously, if you are in the market for this type of product I wouldn't recommend another company. After placing our order, Steve and Chris have been nothing short of brilliant in supporting us on delivery updates, schematic design & support, video calls, install advice... the lot. We are relative novices in this area and ask a lot of questions but the team is always there, exactly what you need from this type of purchase.

Indra Åkerblom

We are extremely pleased with the help we got from Steve and the crew at roamer batteries. We needed to upgrade our battery bank and they helped us out. Such a good price for what you get, extraordinary customer service and they really went above and beyond with helping us sort shipping and installing the battery. Would highly recommend it!

Rowan Robinson

Been thinking about going lithium in the van and came across these guys who have some pretty sick branding. Spoke to Chris who answered all my questions and said they could design me a full system to suit my needs along with a battery! The fact that they took their time talking things through with me was the clincher, the customer service was great! Friendly and knowledgeable, I can definitely recommend these guys.

Felix Van Spall

Roamer supplied the electrical design for our self build camper which saved us weeks of research and newbie mistakes, I highly recommend to anyone taking on a self build. Roamer also supplied all the electrical equipment (price matched) with telephone support fo the install - great when you have those little recommendations and questions you're not sure about. Big Fan

Compare models


Change model
Capacity (Ah)
Nominal Voltage (V)
Continuous Discharge
Continuous Power
Charge Temperature
0 to 60C
Dimensions (mm)
338L x 185W x 215H
11 kg
Total Price


Change model
Capacity (Ah)
Nominal Voltage (V)
Continuous Discharge
Continuous Power
Charge Temperature
0 to 60C
Dimensions (mm)
338L x 185W x 215H
16 kg
Total price
For weekend warriors


Select your Roamer model to compare
For full time living
For high power users
For high power winter users
For arctic explorers
For extended tours
For compact seatbase installs
For off grid adventurers
For extreme expeditions
For occasional off-grid campers
For weekend warriors

Safety First

Here at Roamer, we take safety extremely seriously and strive to make the safest LiFePO4 batteries possible. It is no secret that Lithium can be dangerous and whilst LiFePo4 is without doubt, the safest option, it is still not without risk.  And that’s why we go above and beyond on both compulsory and voluntary extensive safety tests and processes. We choose to test every single battery before it leaves the factory by cycling to 100% and 0% and applying a high charge and discharge load to identify potentially faulty cells and connections, test BMS performance and verify cell balance at the top and bottom of the voltage-charge cycle. Our SMART3 batteries use only traceable branded cells from reputable manufacturers with lab test reports to verify battery safety as part of the EN 61619 certification. Finally, our product and fulfilment services also meet the courier requirements to ship Dangerous Goods under the UN3480 certification. Find out more about the steps we have taken to ensure maximum safety here.

Bluetooth enabled

Less wondering

More wandering

Know your power with the all-new Roamer BMS App - the ultimate wingman for uninterrupted adventure. It’s easy to use, connects via Bluetooth, and lets you track and monitor the status of your battery from the comfort of your van, boat, or home. Real-time feedback at your fingertips.

A deep dive into the


Nominal Capacity
105Ah (1344Wh)
Nominal Voltage
Max Charge Voltage
Recommended Charge Voltage
Recommended Float Voltage
Max Cont. Discharge
  • Dimensions- 338mm L x 185mm W x 215mm H
  • Weight - 11kg
  • Do not modify or take your battery apart
  • Do not short-circuit the battery
  • Do not allow battery to become wet or submerged
  • Do not insert objects into battery,
  • Do not mishandle, drop, throw or knock your battery
  • If damaged, do not use battery
  • Do not use damaged cables or chargers with battery
  • Always store battery in cool and ventilated space
  • Avoid keeping battery in direct sunlight
  • Keep batteries away from flammable materials, liquids and atmosphere
  • Keep batteries away from children and animals
  • Do not allow battery to freeze
  • Do not charge a frozen battery
  • In case of skin or eye contact, rinse immediately with clean water and seek medical help
  • This product contains LiFePO4 so please dispose of it properly as per local laws and regulations
  • Always follow Roamer installation and charging instructions
  • Please contact Roamer with any questions or issues