Enerdrive ePOWER B-TEC Ultra 200Ah Lithium Battery
Lithium conversions are one of the most common upgrades in Australian RVs right now, and Enerdrive's B-TEC Ultra range is one of the more established local options — an aluminium-cased LiFePO4 battery built with an internal BMS and, on the Ultra spec, an IP67-rated case for the inevitable knocks and moisture that come with life under a caravan floor.
Key features
- 200Ah capacity at 12.8V nominal — a genuine deep-cycle replacement for a pair of large AGMs
- Internal battery management system with RS485 communication port
- IP67-rated case on the Ultra G3 revision
- Bluetooth monitoring via companion app
- Rated to roughly 2,000 cycles at 80% depth of discharge
RV use case
At 485×170×245mm and around 25kg, it's a genuine drop-in replacement footprint for many existing dual-AGM setups, which is exactly why it's popular for retrofits rather than just new builds. The usable capacity advantage over AGM is the real draw here — you get close to the full 200Ah in practice, rather than the roughly-half you'd plan around with lead-acid, which changes how many days you can realistically sit off-grid before needing to run the vehicle or a generator.
Pros
- Strong usable capacity relative to size and weight compared with AGM
- IP67 case rating suits the reality of underslung or exposed battery bays
- Bluetooth app monitoring removes the guesswork on state of charge
Cons
- Requires a lithium-compatible charging system — an old AGM-only charger won't get the best from it
- Upfront cost is well above an equivalent-capacity AGM pair
- Cold-weather charging below the chemistry's rated minimum needs the same care as any LiFePO4 battery
Best for
Owners upgrading an existing dual-battery AGM setup who want more usable amp-hours in a similar space, or anyone building a new off-grid system around a single high-capacity battery rather than several smaller ones.
Verdict
It's a straightforward, well-specified lithium upgrade rather than a flashy one — the kind of battery you install once and stop thinking about, provided the rest of your charging system (DC-DC charger, solar regulator) is already lithium-compatible or upgraded alongside it.
Enerdrive ePOWER B-TEC Ultra 200Ah Lithium Battery
Close-up of the specification and compliance label
Top view showing the on/off switch, LED indicator and terminals
Bluetooth app showing state of charge