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Kit includes: ePower B-TEC 125Ah Lithium Battery + 12V 40A DC2DC+ Battery Charger

ePower B-TEC 125Ah Lithium Battery

Enerdrive’s new ePOWER B-TEC LiFePO4, Lithium Iron Phosphate 12v Battery with Smart Phone Monitoring.

The ePOWER B-TEC lithium battery is designed and intended for use in deep cycle applications where a single battery is required that meets the amp hour capacity.

Battery Management System
The battery is also equipped with an internal Battery Management System that can monitor and optimise each Prismatic cell within the battery during normal operation. It will protect the battery pack from over charge, over discharge, over temperature & short circuit. The BMS helps to ensure safe and accurate operation of the battery.
Size & Weight Savings
Lithium v AGM Capacities: 

  • 100Ah Lithium = 160Ah AGM
  • 125Ah Lithium = 200Ah AGM
  • 200Ah Lithium = 320Ah AGM
    (Based on standard depth of discharge for both Lithium (80%) and AGM (50%)    .

The ePOWER B-TEC battery provides 60% more usable power than its equivalent lead acid cousin and being nearly 50% lighter and 30% smaller makes for a superior alternative.
The ePOWER B-TEC battery is perfect for camper trailers, 4WD’s (AUX battery), caravans, small water craft, low power communication sites or any other application that requires the use of a single deep cycle battery that meets the amp hour capacity.
With over 5 years of researching, designing and testing lithium batteries and the associated charging systems, Enerdrive are at the forefront of lithium battery systems in Australia. Enerdrive are the only Australian company that can supply a fully integrated self-branded energy system to suit your setup.
With over 1200 complete systems in operation Australia wide, Enerdrive is regarded as the leader in the field of lithium batteries and energy systems for Mobile, Marine and Remote applications.
Please Note; The ePOWER B-TEC battery is not designed to parallel connect extra batteries to increase the overall capacity. This is due to the internal management system BMS which does not have the ability of physical connection to a second B-TEC BMS system for balancing of the cells between each battery.
If you are requiring a battery system larger than ePOWER B-TEC battery, please look at the Enerdrive Lithium Power Pack Systems which can offer this level of cell balancing protection.

12V 40A DC2DC+ Battery Charger

Designed to meet the rugged demands of Australian conditions and delivering multiple source charging for DC systems.
The Enerdrive ePOWER DC2DC+ Battery Charger is a fully automatic multistage, multi input battery charger with the ability to charge from either an alternator linked to a battery; or via solar power with the in built Maximum Power Point Tracking (MPPT) Solar Controller.


  • Two totally independent DC Inputs for both engine and solar regulation charging one house battery bank output
  • DC M6 screw terminals that will allow for large battery cable connection between all sources
  • A dedicated Maximum Power Point (MPPT) solar regulator
  • The same battery algorithms as included in our AC mains ePOWER battery charger. GEL, AGM, Flooded, Lithium and the ability to create  a full custom profile
  • Vehicle input allows for either 12 or 24v and a maximum solar input of 45V/800W
  • 40A output up to 40+°C with thermo controlled fan cooling
  • Fully programmable LCD display to show which source is charging the battery along with charger status, voltage and amperage
  • Temperature sensor included in charger for more accurate battery charging 

The Enerdrive ePOWER DC2DC+ Battery Charger is a fully automatic multistage, multi input battery charger with the ability to charge from either an alternator linked to a battery; or via solar power with the in built Maximum Power Point Tracking (MPPT) Solar Controller. With two inputs available, the main/house battery will be charged from either the engine while underway, or via the solar panels when stationary. The process to choose either engine or solar is fully automatic and both functions are controlled from within the unit itself without the need for external relays.

During normal operation the ePOWER DC2DC+ Battery Charger will do a full charge cycle to float stage on the house battery bank with ability to choose either GEL, AGM, Flooded, Custom Programmable or Lithium. Once float stage is reached the charger transitions to a power supply mode to support any on-board DC loads.

Multistage Charging Process

The ePOWER DC2DC+ Battery Charger is a fully automatic, set and forget charger. It is designed to quickly and accurately recharge your deep cycle batteries utilising charger algorithms that help to maximise the life of your specialised deep cycle batteries.

The ePOWER DC2DC+ Battery Charger features multistage smart charging technology that enables the charger to be connected to your battery bank permanently. With the input of multiple sources, you can be assured of charging your batteries whenever underway; or when the sun is shining on your solar array.

As dictated by battery manufacturer’s recommendations, deep cycle batteries require a multistage charge sequence for perfect, fast and accurate charging. The Enerdrive ePOWER DC2DC+ smart charger delivers three primary charge stages.

Stage 1 – Bulk or Boost charge
The battery is charged at full rated output current of the charger until the battery reaches its final charging voltage, known as its absorption voltage. In this step, around 80% of the battery is recovered as fast as possible.

Stage 2 – Absorption Charge
With the charger voltage held steady, the remaining 20% is replaced with the charger allowing the current to taper off as the battery approaches full charge.

Stage 3 – Float
Finally, in the float stage the charger voltage is lowered and held at a constant and safe predetermined level. This prevents the battery from being overcharged, yet allows the charger to supply enough current to make up for the self-discharge losses of the battery, while supporting any additional loads connected to the battery (such as DC lighting and refrigerators). This stage allows for the charger to be used as a DC power supply.

Smart Charging Feature
The ePOWER DC2DC+ Battery Charger will regulate its output based on the loads connected to your battery bank. This function is important to maintain the life of your battery bank as some battery chargers mistake loads for discharge and continue to keep the batteries in the bulk or absorption stage for extended periods of time, which will damage the battery bank. The ePOWER DC2DC+ Battery Charger has two methods of load based regulation to ensure your battery charger transitions to float when it should do so.
Battery Temperature SensorBattery Temperature Sensor
Included standard with all ePOWER Battery Chargers.


ePower B-TEC 125Ah Lithium Battery


  • Nominal Voltage: 12.8V
  • Nominal Capacity: 125Ah
  • Cycle Life (DOD – 80% under controlled conditions): ≥ 2000 Cycles

Standard Charge Specification (Lithium profile charger required)

  • Battery Charge Temperature: 0 ̴ 45°C
  • Normal Charge Voltage CV/CC*: 14.40 ̴ 14.60V
  • Standby (Float) Voltage: 13.50 ̴ 13.80V
  • Maximum Charge Current: 60A @ 25°C for 30mins
  • Recommended Charge Current for Maximum Life: ≤40A

Standard Discharge Specification

  • Battery Discharge Temperature: -20 ̴ 60°C
  • Battery Output Voltage Range: 11.00 ̴ 14.60V
  • Maximum Discharge Current: 100A @ 25°C ± 5°C for 30mins
  • Pulse Discharge Current: 50A for 1.0s
  • Discharge Cut-off Voltage: ≤11.20V

Circuit Protection

The battery is supplied with a LiFePO4 Battery Management System BMS that can monitor and optimize each single prismatic cell during charge & discharge, to protect the battery pack from overcharge, over discharge & short circuit. Overall, the BMS helps to ensure safe and accurate operation of the battery.

Over-Charge Protection

  • Over-charge Protection Per Cell: 3.90V ± 0.03V
  • Over-charge Release Per Cell: 3.60V ± 0.05V
  • Over-charge Release Method: Discharge below release voltage
  • Over-discharge Protection Per Cell: 2.80V ± 0.05V
  • Over-discharge Release Per Cell: 3.20V ± 0.05V
  • Over-discharge Release Method: Apply Charge/Voltage ≥12.8V
Over Current Protection
  • Discharge Over Current: 110A for 30s – 450A for 1s
  • Protection Reset Time: 5s Auto Release
  • Over Current Release Method: Disconnect Load
Over Temperature Protection
  • Battery Discharge Over Temperature:
    Protection to 65°C ± 5°C
    Release at 50°C ± 5°C
  • Battery Charge Over Temperature:
    Protection to 55°C ± 5°C
    Release at 45°C ± 5°C
  • Short Circuit Protection: Auto release after 5s
Storage Information
  • Temperature & Humidity Range:
    ≤ 30 days -20°C ̴ 35°C, 45 ̴ 75% RH
    ≥ 30 days -10°C ̴ 30°C, 45 ̴ 75% RH
  • Self-discharge Rate: ≤ 3% Per Month

12V 40A DC2DC+ Battery Charger

Output Rating:
Output Voltage: 12V Nominal (8.0V min)
Output Current (Maximum): 40A ~ 50A
Output Power: 775W
Charger DC Output (CH1):
Selectable Battery Type: Gel, AGM, Flooded, Lithium, Program
Charger Voltage Range: 13.8V – 15.5V
Float Voltage Range: 13.0V – 13.8V
Charger Current (User Selectable): 5/10/15/20/25/30/35/40/45/50A (default 40A)
Equalize Voltage (Flooded Battery): 15.5V
Equalize Charging Current: 10% of Bulk Current Setting
Charging Control: 2 stage / 3 stage selectable (Default 3 stage)
DC Output Bank: Single
Charger DC Output (CH1):
Current draw from CH1 when in use: = < 50mA
Battery Temperature Setting: Low/ Normal/ High (Battery Temperature Sensor Standard)
Efficiency: 95%
INPUT Rating (CH2 – MPPT Solar):
Input Voltage: 14.5 – 45VOC
Maximum Input: ≤ 23V input, 500W (600W allowable) ≥37.5V-45V input, 750W (800W allowable)
INPUT Rating (CH3 – Start/Alternator):
Input Voltage: 10.5 – 16VDC / 21 – 32VDC
Maximising your Solar Harvest using the DC2DC+

The Solar Input on the DC2DC+ unit has a maximum rated INPUT current of 30amps. This means it is optimised for using higher voltage ‘grid’ type modules for best output performance. The maximum achievable output using standard 20Voc solar modules will be approx 35amps @ 14.4Vdc
Note: Left/right table scroll in mobile view
Panel Array Rated Wattage & Volts Open Circuit Rating Estimate DC Amps Output
(## see below)
1 150 watt @ 20 Voc 150 watts 10
1 200 watt @ 43 Voc 200 watts 13
2 150 watt @ 20 Voc 300 watts 21
2 150 watt @ 20 Voc 400 watts 27
3 200 watt @ 43 Voc 450 watts 31
3 150 watt @ 20 Voc 600 watts 42
4 200 watt @ 43 Voc 600 watts 35*
4 150 watt @ 20 Voc 800 watts 47**
5 200 watt @ 43 Voc 1000 watts Not recommended
5 150 watt @ 20 Voc 1000 watts Not recommended

* Maximum achievable output on the DC2DC+ unit when using 20Voc Solar Panels will be the approx 35amps.

** Maximum achievable output on the DC2DC+ unit when using 43Voc Solar Panels will be the approx 47amps.
## IMPORTANT NOTE: Estimated Amps Output is quoted based upon PERFECT Solar conditions including Sun Angle, Panel Mounting angle and Orientation to the sun. It needs to be noted that panel performance alters dramatically between Summer and Winter periods and actual performance may be impossible to predict.

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