The Battle Born 100Ah Dual Purpose Deep Cycle Battery is arguably the most popular lithium battery for UK van life in 2026. At £350-£500, it's not cheap — but it might be the most important investment you make in your van build.
This review covers every aspect of the Battle Born battery: specs, performance data, installation tips, UK pricing, and whether it's worth the premium for your van life setup.
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What Is the Battle Born 100Ah Battery?
The Battle Born 100Ah is a 12V lithium iron phosphate (LiFePO4) battery designed for deep cycle applications. It's marketed as a "dual purpose" battery — meaning it can handle both starting and deep cycling, though it's primarily designed as a house battery.
Key specifications:
- Voltage: 12V nominal (11.2V-14.6V)
- Capacity: 100Ah (1,280Wh usable)
- Chemistry: LiFePO4 (Lithium Iron Phosphate)
- Weight: 25kg
- Dimensions: 513mm × 171mm × 215mm
- Warranty: 10 years
- Price: £350-£500 (Amazon UK)
Detailed Specifications
Performance Specs
| Specification | Value |
|---|---|
| Nominal Voltage | 12V |
| Capacity | 100Ah |
| Energy | 1,280Wh |
| Continuous Discharge Current | 100A |
| Peak Discharge Current | 200A (30s) |
| Continuous Charge Current | 50A |
| Internal Resistance | ~25mΩ |
| Depth of Discharge | 100% |
| Cycle Life | 3,000-5,000 (to 80% capacity) |
BMS (Battery Management System)
The Battle Born's built-in BMS is one of its biggest advantages. It provides comprehensive protection:
- Over-discharge: Cuts off at 10V (prevents permanent damage)
- Overcharge: Cuts off at 14.6V (prevents thermal runaway)
- Over-current: 100A continuous, 200A peak
- Short circuit protection
- Temperature compensation: Works down to -20°C
- Cell balancing: Ensures all 4 cells stay equalized
Battle Born vs AGM: The Numbers
This is the most common question for UK van lifers choosing a battery.
| Feature | Battle Born LiFePO4 | AGM Battery |
|---|---|---|
| Upfront Cost | £350-£500 | £150-£250 |
| Usable Capacity | 100Ah (100% DoD) | 50Ah (50% DoD) |
| Usable Wh | 1,280Wh | 640Wh |
| Cycle Life | 3,000-5,000 | 500-1,000 |
| Weight | 25kg | 30-35kg |
| Lifespan (years) | 10+ | 3-5 |
| Cost per Wh (lifetime) | £0.28 | £0.35 |
The Real Cost Comparison
Over the lifespan of one Battle Born battery:
- You'd need 3-4 AGM batteries (same total capacity)
- AGM total cost: £450-£1,000
- Battle Born total cost: £350-£500
The Battle Born actually costs less over its lifetime while delivering double the usable power at half the weight.
UK Performance Data
Real-World Daily Usage
Based on typical UK van life setups:
Light usage (1 person, basic setup):
- LED lights: 20Wh (2hrs × 10W × 2 fixtures)
- Phone charging: 20Wh (2 charges × 10Wh)
- Water pump: 15Wh (5min × 50W)
- 12V fridge: 300Wh (running 8hrs)
- 12V fan: 30Wh (4hrs × 7.5W)
- Total: ~385Wh per day
- Battle Born runtime: 3+ days before recharge
Medium usage (couple, moderate setup):
- LED lights: 40Wh (4hrs × 10W × 2 fixtures)
- Phone charging: 20Wh
- Fridge: 400Wh
- Water pump: 20Wh
- 12V fan: 30Wh
- Laptop: 60Wh
- Total: ~570Wh per day
- Battle Born runtime: ~2 days before recharge
Heavy usage (couple, full setup with inverter):
- LED lights: 40Wh
- Phone charging: 20Wh
- Fridge: 400Wh
- Water pump: 20Wh
- 12V fan: 30Wh
- Laptop: 60Wh
- Inverter (TV + microwave): 300Wh
- Total: ~870Wh per day
- Battle Born runtime: ~1.5 days before recharge
Temperature Performance in UK Winters
| Temperature | Discharge | Charge | Notes |
|---|---|---|---|
| +20°C | Full | Full | Optimal performance |
| +10°C | 95% | 95% | Negligible impact |
| +5°C | 90% | 90% | Slight reduction |
| 0°C | 90% | (BMS limits) | Charge auto-limits |
| -4°C | 80% | (BMS limits) | Discharge still good |
| -10°C | 70% | (BMS limits) | Battery blanket recommended |
Installation Guide
Mounting the Battle Born
The 25kg battery can be mounted in any orientation. Recommended mounting methods:
-
Custom wooden box — Most popular in UK builds. Uses 18mm plywood, sized to battery dimensions, with 4x M8 bolts through the base. Cost: ~£30 for materials.
-
Aluminum bracket — Lightweight and corrosion-resistant. Many UK van builders use 3mm aluminum with self-tapping screws. Cost: £40-60.
-
Battery box enclosure — Commercial options available from Van System UK and Swaggy Campervans. Cost: £60-120.
Wiring Requirements
Cable sizing:
- Up to 1m run: 6mm²
- 1-2m run: 10mm²
- Over 2m run: 16mm²
Fuse required: 100A DC fuse within 30cm of battery positive terminal Terminals: M8 bolts included with battery
Step-by-Step Installation
- Choose location — Centralised weight distribution, accessible for maintenance
- Build mounting platform — Wooden box or aluminum bracket
- Secure battery — M8 bolts, rubber washers for vibration dampening
- Run positive cable — 6mm²+, fuse within 30cm
- Run negative cable — Direct to chassis earth or battery negative busbar
- Connect charge controller — MPPT or DC-DC charger
- Test connections — Voltmeter check (should read ~12.8V)
Wiring Diagram (Text)
Solar Panel → MPPT Controller → Battle Born (+) fuse → Battery
→ Battery (-) → Busbar → Loads
Alternator → DC-DC Charger → Battle Born (+) fuse → Battery
Mains Charger → 12V Charger → Battle Born (+) fuse → Battery
Battle Born vs Alternatives
Battle Born vs Vision HE100
| Feature | Battle Born | Vision HE100 |
|---|---|---|
| Price | £350-£500 | £200-£350 |
| Warranty | 10 years | 3 years |
| Weight | 25kg | 12kg |
| Cycle life | 3,000-5,000 | 2,000-3,000 |
| BMS | Advanced | Basic |
| Best for | Reliability | Budget |
Battle Born vs Exide AGM 100
| Feature | Battle Born | Exide AGM |
|---|---|---|
| Price | £350-£500 | £150-£250 |
| Usable capacity | 100Ah (100% DoD) | 50Ah (50% DoD) |
| Weight | 25kg | 30kg |
| Cycle life | 3,000-5,000 | 500-1,000 |
| Best for | Long-term value | Budget entry |
Pros and Cons
Pros
- ✅ 10-year warranty — industry best
- ✅ 100% depth of discharge — double the usable power of AGM
- ✅ 3,000-5,000 cycle life — lasts 10+ years
- ✅ Built-in BMS — comprehensive protection
- ✅ Lightweight — half the weight of equivalent AGM
- ✅ Stable voltage throughout discharge
- ✅ No maintenance required
- ✅ Works well in UK winters
Cons
- ❌ Higher upfront cost than AGM
- ❌ Needs proper charging setup (BMS limits charge below 0°C)
- ❌ 25kg is still heavy for a "lithium" battery
- ❌ Not a starter battery — use separately for engine starting
- ❌ Premium brand (but quality justifies the cost)
Best Charge Controllers to Pair With It
The Battle Born works with any quality MPPT controller:
-
Victron SmartSolar MPPT 100/30 — £80-120
- Best overall for Battle Born
- Bluetooth connectivity
- Works with Victron app
-
Renogy Rover 40A — £60-90
- Budget-friendly
- Good performance
- Can pair with 200W solar panel
-
NKyming MPPT 30A — £30-50
- Ultra-budget option
- Decent for basic setups
- No Bluetooth
UK Buying Guide
Where to Buy in the UK
- Amazon UK — £350-£500 (competitive, fast delivery)
- Van System UK — Premium pricing, expert advice
- Swaggy Campervans — £380-£500
- Halfords — Sometimes stocks Battle Born
- Direct from Battle Born — £450 (manufacturer direct)
Common UK Bundles
- Battle Born 100Ah + Victron MPPT 100/30 + 200W solar — £650-800
- Battle Born 100Ah + DC-DC Charger — £550-700
- Dual Battle Born (200Ah) + Victron MPPT + 200W solar — £1,100-1,400
Final Verdict
The Battle Born 100Ah is the gold standard for van life lithium batteries in the UK. At £350-£500, it's more expensive than AGM upfront — but with 3,000-5,000 cycles, 100% usable capacity, and a 10-year warranty, it delivers the best cost-per-watt in the market.
For UK van lifers planning extended travel — especially overwintering — the Battle Born is worth every penny. The lithium chemistry handles cold UK winters better than AGM, and the lightweight design (half the weight of AGM) makes it easier to install in smaller vans.
Rating: 4.5/5 stars
