Compare the exact Fogstar Drift model's capacity, BMS rating, temperature features and dimensions; this guide does not claim a measured capacity test.
Comparison basis: This guide compares published specifications and installation requirements. We have not documented a hands-on test of this product; calculations are labelled examples, and manufacturer claims are not our measurements.
Fogstar Drift is one of the most visible UK-focused LiFePO4 ranges for campervans. Its appeal is straightforward: high usable energy, app monitoring, cold-weather features and UK support at a price generally below many premium marine and off-grid brands.
This is a specification-based comparison of the current 105Ah and 230Ah Gen2 products. It replaces unsupported claims that Roam Wired performed capacity tests or winter trials.
Verdict
Current specifications
| Specification | Drift 105Ah | Drift 230Ah Gen2 |
|---|---|---|
| Nominal energy | 1,280Wh | 2,944Wh |
| Nominal voltage | 12V class | 12.8V |
| Maximum continuous discharge | 100A | 300A |
| Monitoring | Bluetooth | Bluetooth |
| Low-temperature heating | Yes | Yes |
| Environmental rating | IP67 | IP67 |
| Listed weight | 10kg | Approximately 23kg |
| Listed warranty | 10 years | 10 years |
Sources: Fogstar's current 105Ah product specifications and 230Ah Gen2 specifications. Save the manual and warranty supplied with the exact unit because specifications can change.
What we like
Useful cold-weather features
Charging LiFePO4 cells below their permitted temperature can cause permanent damage. Both current products advertise automatic heating and low-temperature protection. That makes the range more practical for an unheated UK van than a basic battery without cold-charge controls.
Heating consumes energy and operates only under defined conditions. It does not make an exposed battery compartment suitable without considering insulation, water, road debris and the manual's limits.
Bluetooth is included
The app provides battery-level information without a separate display. It can be useful for checking cell temperature, protection states and approximate state of charge.
A battery's Bluetooth BMS is not necessarily a whole-system energy monitor. If several batteries are paralleled or you want a consistent record of every charger and load, a correctly installed shunt battery monitor remains valuable.
The 230Ah model supports high-current systems
Fogstar lists a 300A continuous BMS for the 230Ah Gen2. That provides more inverter headroom than the 105Ah model's 100A rating. The rest of the system—battery terminals, busbars, fuses, isolator and cables—must still be designed for the actual current.
For a 2,000W inverter at 90% efficiency and 12V under load:
DC current ≈ 2,000W ÷ 0.90 ÷ 12V = 185A
That is above a single 105Ah battery's listed continuous limit but inside the 230Ah Gen2 headline limit. Surge requirements and voltage sag still need checking.
Limitations and buying risks
Similar names cover different generations
Retailer listings, used batteries and old reviews may describe the original 100Ah or 230Ah products rather than the current 105Ah and Gen2 models. Match the SKU, label, dimensions, BMS rating and manual before relying on any comparison.
A ten-year headline is not the complete warranty
Read the current warranty booklet for exclusions, remedies, proof-of-purchase requirements and any pro-rata terms. Warranty duration alone does not show how quickly a failed battery will be diagnosed or replaced during a trip.
IP67 does not waterproof the whole installation
An IP rating for the enclosure does not make exposed terminals, lugs, fuses and connected equipment waterproof. Use terminal covers, secure cable support and a protected mounting location.
Which size suits a campervan?
Choose 105Ah when
- daily use is modest;
- the inverter demand stays within the battery's permitted current;
- frequent solar, alternator or hook-up charging is available;
- low weight and compact dimensions matter.
Choose 230Ah when
- you need roughly twice the stored energy;
- induction cooking or a larger inverter creates higher current;
- longer gaps between charging are expected;
- the van can safely carry and restrain the additional weight.
Use the campervan electrical calculator to model watt-hours and peak current separately.
Installation checklist
- Confirm the exact battery's charge voltage and maximum charge current.
- Check every charger has an allowed LiFePO4 profile.
- Calculate the maximum continuous and surge current.
- Size the fuse, switch, busbar and cables together.
- Mount the battery against crash and vibration loads.
- Protect terminals from tools, luggage and conductive objects.
- Confirm heater behavior for winter storage and charging.
- Keep the manual and warranty with the vehicle documentation.
Bottom line
The current Fogstar Drift products offer a convincing mix of integrated monitoring, cold-weather support and UK availability. The 105Ah is better suited to moderate systems; the 230Ah Gen2 is the more credible option for high-energy and high-current builds. The right decision comes from the electrical design, not the cost per amp-hour alone.
Choose capacity from your actual appliances
Use Roam Wired's free electrical design tool to calculate battery energy, inverter demand and charging requirements before choosing 105Ah or 230Ah.
Disclosure: This is an editorial assessment based on current manufacturer documentation, not a claim of Roam Wired laboratory or winter testing. Some links may earn Roam Wired an affiliate commission at no additional cost to you.
Worked planning check
A nominal 12.8V, 230Ah battery stores 2,944Wh. An illustrative 80% energy allowance leaves 2,355Wh DC. At a 700Wh daily battery demand that is about 3.4 days before recharging, excluding changes in temperature and ageing. This calculation is not a Fogstar test result.
The figures or dimensions in this example are explicit planning assumptions, not a product test or an installation specification. Replace them with your equipment data and actual measurements.
Planning questions
How much energy is in a 100Ah lithium battery?
At nominal 12.8V, the arithmetic is 1,280Wh. Delivered energy is lower after your reserve, losses and operating limitations; it is not a measured capacity result.
Can I mix battery brands or capacities?
Only with explicit manufacturer approval for the complete arrangement. Chemistry, voltage, age, current sharing and BMS behaviour can make a seemingly simple combination unsuitable.
Can lithium batteries charge in freezing weather?
Follow the exact battery’s permitted temperature range and heating conditions. Do not bypass a protective cutoff or infer charge permission from air temperature alone.
Fogstar Drift versus Roamer: compare exact generations
Compare the current Drift quotation with the exact Roamer model being offered. The manufacturer's Roamer 230SMART4 listing specifies 230Ah at 12.8V, internal BMS, Bluetooth and a 300A continuous discharge rating. Confirm the current generation and availability; do not transfer those specifications to a different Roamer battery.
| Comparison | What to put beside each quote |
|---|---|
| Stored energy | Nominal voltage × Ah, then the same usable-energy allowance |
| High-power loads | Exact continuous and surge current limits |
| Winter use | Charge temperature range, heating conditions and energy requirement |
| Installation | Dimensions, weight, terminal clearance and mounting |
| Ownership | Written warranty, support route and return costs |
We have no controlled capacity test or original installation photos for either comparison battery. An eventual test should record model, temperature, charging procedure, discharge current, cutoff, Ah and Wh. Until then, nominal energy and manufacturer ratings must remain labelled as such.
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Jack Kennedy is a self-builder who has built two vans. He created Roam Wired to simplify conversion planning and share free tools, supported by affiliate links.
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