We recommend the TTWEN 12V 300Ah Bluetooth battery for RV, marine, and off-grid builds that need a large LiFePO4 bank at 12V. Price $300.00. Confirm the benefit in the final order summary before paying. Best for system builders who need a large 12V LiFePO4 bank for an RV, boat, or off-grid setup.
A large 3,840Wh deep-cycle battery with Bluetooth monitoring.
We recommend the TTWEN 12V 300Ah Bluetooth battery for RV, marine, and off-grid builds that need a large LiFePO4 bank at 12V. TTWEN lists 3,840Wh of energy, a 200A BMS, a 2,560W maximum continuous load, Bluetooth 5.0 monitoring, and IP65 protection. The physical tradeoff is real: the manufacturer graphic gives a 20.55 × 9.37 × 8.58-inch case and approximately 55.55 lb. Choose the 100Ah Group 31 model when that smaller form factor and 1,280Wh are enough, or a complete power station when you want AC outlets, an inverter, and charging controls in one unit. The product page does not give the terminal type or a full installation guide, so confirm fit, charging limits, and system protection before wiring around its 200A rating.
What we like
- A large energy reserve in one battery
- Bluetooth readings are part of the design
- The maker publishes useful system limits
Keep in mind
- Measure the battery bay before buying
- This is a battery, not an AC power station
- Some installation details are missing
The details that matter.
Manufacturer specifications for the configuration reviewed.
- Variant / SKU
- Blue · TTWEN-12-300BT-US
- Chemistry
- LiFePO4 (lithium iron phosphate)
- Nominal voltage
- 12.8V (12V class)
- Rated capacity
- 300Ah / 3,840Wh
- Battery management system
- 200A BMS
- Maximum continuous load
- 2,560W (manufacturer stated)
- Cycle life claim
- 4,000 cycles at 100% DOD; 6,000 at 80%; 15,000 at 60%
- Bluetooth
- Bluetooth 5.0; app displays state of charge, power, and voltage
- Ingress protection
- IP65
- Discharge temperature
- −20°C to 60°C (manufacturer stated)
- Label charging details
- 14.4V ±0.2V; 60A recommended charge current (0.2C)
- Dimensions
- 20.55 × 9.37 × 8.58 inches (manufacturer graphic)
- Weight
- Approximately 55.55 lb (manufacturer graphic)
- Expansion claim
- Manufacturer lists 4P4S, up to 61.44kWh and 40.96kW; confirm the exact configuration in the product instructions
Choose it for a larger 12V system
This model makes sense when a 100Ah bank is too small for the loads or days between recharges, and a standalone battery is a better fit than a boxed power station. TTWEN lists 3,840Wh, compared with 1,280Wh for its 12V 100Ah Group 31 model. That is a meaningful capacity step, but the 300Ah battery also asks for more installation space, support, and handling.
Check the physical fit and weight first
Before planning the wiring, compare the manufacturer’s 20.55-inch length, 9.37-inch width, and 8.58-inch height with the usable compartment. The listed 55.55 lb is a substantial lift. Leave room for the terminals and cables, and confirm that the tray and mounting can support the battery in its intended installation.
Match charger and system components to the label
The official battery graphic lists 14.4V ±0.2V and a recommended 60A charge current. It also lists a 200A maximum continuous discharge current and a 2,560W maximum load. Use the exact product instructions to choose the charger, fuse, cable, and inverter rather than treating the BMS rating as a complete system design.
Use Bluetooth and expansion claims carefully
The product description says Bluetooth 5.0 can show state of charge, power, and voltage in the maker’s app. TTWEN also lists a 4P4S configuration. Confirm the required app, wiring, and limits in current instructions before relying on remote readings or combining batteries.
Choose between the 100Ah case and a power station
The 100Ah Group 31 battery is the more compact option when 1,280Wh is enough and its case dimensions fit. A portable power station is easier when you want an integrated inverter, display, charging inputs, and ready-to-use ports. The 300Ah TTWEN is the better fit when a larger 12V battery bank is the priority.
Why we like it.
A large energy reserve in one battery
TTWEN lists 300Ah and 3,840Wh at 12V class voltage. That is three times the capacity listed for its 100Ah Group 31 battery, while keeping the system based on a single battery unit.
Bluetooth readings are part of the design
The listing describes Bluetooth 5.0 and an app that displays state of charge, power, and voltage. That gives a builder another way to check battery status without assuming the phone or any extra monitoring equipment is included.
The maker publishes useful system limits
TTWEN lists a 200A BMS, a 2,560W maximum continuous load, and a 4P4S expansion configuration. These figures help narrow a system plan, subject to the full product instructions and compatible wiring.
A few things to consider.
Measure the battery bay before buying
The manufacturer graphic lists 20.55 × 9.37 × 8.58 inches and about 55.55 lb. It is much larger and heavier than a Group 31 battery, so check the tray, access, mounting, and lift path.
This is a battery, not an AC power station
The listing does not specify an integrated inverter, AC outlets, or a full control panel. Plan the charger, inverter, distribution, and protection components for the actual system.
Some installation details are missing
The visible page does not state the terminal type or a charging-temperature range. Request the current manual and confirm those details before ordering, especially for cold-weather use.
Get the 12V 300Ah Bluetooth LiFePO4 Battery.
System builders who need a large 12V LiFePO4 bank for an RV, boat, or off-grid setup. Check the current price and configuration with LiFePO4 Store.
Your LiFePO4 Store reader offer.
Confirm the benefit in the final order summary before paying.
See the LiFePO4 Store code, terms & redemption stepsA few good questions.
What is the discount code for the TTWEN 12V 300Ah Bluetooth LiFePO4 Battery?
The LiFePO4 Store discount code is SEGPDGWJ for 2% off at ttwen.com. Confirm the benefit in the final order summary before paying.
How much energy does the TTWEN 12V 300Ah battery list?
The manufacturer lists 300Ah and 3,840Wh at 12.8V nominal voltage.
What is its maximum continuous load?
TTWEN lists a 200A BMS and a 2,560W maximum continuous load. The product page does not list a built-in AC inverter or outlets.
How large and heavy is the Blue battery?
The manufacturer graphic lists 20.55 × 9.37 × 8.58 inches and approximately 55.55 lb. Allow clearance for terminals and cables when checking a battery compartment.
Can I charge it below freezing?
The visible product description lists a discharge range of −20°C to 60°C but does not state a charging-temperature range. Check the current manual before planning cold-weather charging.
Can the app replace an installed battery monitor?
TTWEN describes Bluetooth 5.0 app readings for state of charge, power, and voltage. The listing does not specify whether a separate display is included, so confirm the monitoring setup for your installation.
About this review
TTWEN official product page and product graphics, with our editorial assessment. Product details checked October 28, 2026 against LiFePO4 Store's official product listing. Shop the official LiFePO4 Store store. Images courtesy of the manufacturer. Our editorial standards.
