12V And 24V Lithium Batteries
12V 100Ah Group 31 Deep Cycle Lithium Battery
The group 31 version of the 100Ah pack, built in the 330 x 172 x 240 mm case used across marine, RV and commercial vehicle installations.
Product Overview
The group 31 version of the 100Ah pack, built in the 330 x 172 x 240 mm case used across marine, RV and commercial vehicle installations. Same cells, same 100A BMS, same IP65 ABS construction and the same 3000+ cycle rating as the standard 100Ah pack - the difference is that it drops into a group 31 tray and strap without modification.
Key benefits
Why Buyers Choose This Pack
Group 31 Fitment
The tray, the hold-down and the cable runs all stay as they are, which is what makes the upgrade a swap rather than a project.
9.7 kg In A Group 31 Case
Roughly a third of the weight of the lead-acid battery designed for the same tray.
Full Usable Capacity
Nearly all of the 100Ah is available, against about half on the lead-acid battery it replaces.
Bluetooth Monitoring
Real state of charge from a pack in an awkward mounting position, without a meter on the dash.
Application scenarios
Where It Is Used
- Marine house banks using group 31 trays
- Commercial vehicles and truck auxiliary power
- RV and caravan installations
- Solar and off-grid systems
- Emergency and standby lighting systems
- Multi-pack parallel banks in group 31 racks
Who it is for
The Buyers This Pack Suits
Marine Installers
Where group 31 is the standard tray across the fleet or the yard.
Fleet And Commercial Vehicle Operators
Standardising on one case size across many vehicles.
Distributors
Carrying the group 31 format alongside group 24 so counter sales are like-for-like.
Problems it solves
What It Fixes
A Pack That Does Not Fit The Tray
Group 31 is a standard for a reason. A pack built to it avoids fabrication.
Weight In Marine Installations
Trays high in a hull carry weight where it matters most.
Unknown Remaining Capacity
Bluetooth monitoring answers the question a flat discharge curve hides.
Specifications
Published Figures For This Pack
Every value below comes from our own product specification. Where a figure is not published we leave it out rather than estimating it.
| Nominal voltage | 12.8 V |
|---|---|
| Capacity | 95-100 Ah consistent output |
| Case | BCI group 31, 330 x 172 x 240 mm |
| Weight | 9.7 kg |
| BMS current | 100 A smart BMS |
| Cycle life | 3000+ deep discharge cycles |
| Ingress protection | IP65, ABS case |
| Monitoring | Bluetooth real-time monitoring |
| Certificates | MSDS, UN38.3, CE, ROHS, UL |
| Cells and BMS | Grade A LiFePO4 cells, smart BMS |
Packing and documents
How It Ships And What Comes With It
Packing And Shipping
Packing follows UN38.3 requirements for lithium battery transport, and the carton and pallet arrangement is confirmed with the quotation for your quantity and destination. We do not publish a fixed carton specification here because it changes with order size and freight mode.
Documentation
UN38.3 and the MSDS travel with every lithium shipment, and the certificates listed in the specification table above are supplied for the model you order. Tell us the destination market at the quotation stage so the document set is planned rather than chased after the goods are built. Where a certificate we do not hold is required, we will say so rather than promise it.
Manufacturing
This pack is built at Shenzhen Sike Power Technology Co., Ltd. in Da Peng New District, Shenzhen, with cell grading, assembly, BMS integration, aging test and final inspection carried out in house. Only brand-new grade A LiFePO4 cells and a top-brand smart BMS go into it.
Download the catalogue and datasheets for the specification in PDF form.
Installation guide
Getting It Right First Time
Step 1
Confirm the tray is true group 31 at 330 x 172 x 240 mm before ordering.
Step 2
Check the hold-down strap clears the terminals in the new pack's layout.
Step 3
Set every charging source to a LiFePO4 profile.
Step 4
Fuse each pack individually in a parallel bank.
Step 5
Avoid charging below freezing, or ask us about heated options for cold climates.
Comparison
How It Compares In Our Range
Same electrical specification, different case - fitment is the whole decision.
| Group 31 100Ah | 330 x 172 x 240 mm, marine and commercial trays |
|---|---|
| Group 24 100Ah | 260 x 170 x 210 mm, smaller tray |
| 12V 150Ah | More capacity, 330 x 172 x 215 mm |
| 12V 200Ah | Larger lithium-only case, 200 A BMS |
FAQ
12V 100Ah Group 31 Deep Cycle Lithium Battery Questions
Is this a true group 31 case?
The published dimensions are 330 x 172 x 240 mm, built to drop into a group 31 tray. Measure your tray if it has been modified.
How does it differ from the group 24 pack?
Only the case. Cells, BMS rating, cycle life and IP rating are the same - the group 24 pack is 260 x 170 x 210 mm for a smaller tray.
Can I use it for engine starting?
No. This is a deep cycle energy storage battery. Our automotive-case packs are also explicitly not cranking batteries.
What is the weight saving?
At 9.7 kg it is about a third of the weight of a group 31 lead-acid battery.
Can I parallel several?
Yes, with matched packs and individual fusing. Send us the bank size for confirmation.
Which certificates apply?
MSDS, UN38.3, CE, ROHS and UL.
Related products
Other Packs Buyers Look At
Applications
Sectors That Use This Pack
Marine And Trolling Motor Batteries
12V and 24V deep cycle packs for trolling motors, electronics and house loads, IP65, 3000+ cycles.
RV And Camping Power
12V and 24V LiFePO4 house banks from 100Ah to 400Ah, IP65, Bluetooth monitored, at about a third of the weight of lead-acid.
Further reading
Guides That Cover This Pack
Group 24 Group 31 H7 And H8 Case Sizes Explained
Which BCI and European case standards our packs use, the exact dimensions, and why the tray decides the pack.
LiFePO4 Versus Lead-Acid For Deep Cycle Work
Why a 100Ah lithium pack replaces a 200Ah lead-acid bank, what changes about charging, and where lead-acid still makes sense.
Quote The 12V 100Ah Group 31 Deep Cycle Lithium Battery
Send the quantity, the application and the destination, and we will confirm specification, packing and lead time.