Dometic PLB40 Portable Lithium Battery
Dometic's PLB40 takes a similar idea to a portable power station but strips it back to just the battery — a self-contained, carry-handle lithium unit designed to feed 12V accessories like a compressor fridge directly, without the full inverter and AC-output bulk of a larger station.
Key features
- 40Ah / 512Wh capacity at 12.8V nominal, LiFePO4 chemistry
- Rated for around 2,000 charge cycles
- DC output of 12.8V at up to 15A (150W continuous), plus two USB outputs
- Compact dimensions at 197×197×255mm, weighing 7.3kg
- IP44-rated case with built-in BMS protection
RV use case
This is designed to run a portable fridge or similar 12V accessory independently of the vehicle's main battery system — genuinely useful for camper trailer owners, tent-based tourers, or as a backup supply for a fridge left running in a shaded spot while the main vehicle is off exploring. The compact carry-handle format means it moves easily between the vehicle and camp without needing a fixed installation.
Pros
- Purpose-built for running a 12V fridge independently, with a straightforward output design
- Genuinely portable at just over 7kg
- Solid cycle life for the capacity, suiting regular repeated use
Cons
- No AC inverter output, so it's limited to 12V/USB devices rather than mains appliances
- 40Ah capacity is modest next to a full house battery bank
- IP44 rating is modest — worth keeping it out of direct exposure rather than treating it as fully weatherproof
Best for
Owners wanting a dedicated, portable power source to run a 12V fridge or similar accessory independently — particularly camper trailer and tent-based travellers.
Verdict
It does one job cleanly — keeping a 12V fridge running independently of the main battery system — rather than trying to be a do-everything power station. For that specific use, the size and cycle life stack up well.
Dometic PLB40 Portable Lithium Battery
Close-up of the display and output ports
Close-up of the port cluster and reset button
Close-up of the USB and DC output ports with locking connector