Exotronic 12V JK Smart Bluetooth Lithium Battery Manual

Notes & Limitations

  • The State of Charge monitor cannot read current below ~1A and can drift out of several weeks of no use. Complete a full charge cycle to re-calibrate.
  • After a trip, connect to a suitable power supply or charger to restart the BMS.
  • After long periods of no use, or if continuously fast charging, the cells may get out of balance. The active balancer will correct this issue, to allow the balancer time to work, trickle/slow charge the battery to 14.2-14.4V and allow to hold that voltage until balanced.
  • Charge at least once every 3 months.
  • If the battery trips on low voltage, and is left unattended for several weeks, the cells will continue to drop voltage and the battery may become unrecoverable – the battery must be charged within 72 hours after a low voltage trip.
  • To extend the service life, it is recommended to use the battery between 10 and 90% State of Charge.
  • Over-current trips will automatically reset after 60s.


To maximise the longevity and safety of your new lithium batteries, please ensure you follow stay within the specified parameters. Ensure terminals are torqued and bolts are not bottomed out. Failure to do so could result in shortened lifespan and void your warranty.

Risk of Fire / Explosion

  • Do not short circuit the battery or allow excess dust/moisture between terminals
  • Always check polarity before powering equipment on
  • Do not expose to direct sun light or sea water
  • Do not install near heat sources
  • Always fuse the output positive of the battery with a fuse no greater than 1.5C (I.e. 150A for the 100Ah battery, 300A for the 200Ah battery)


  • To be installed by a competent personCaution symbols, do not dispose of in fire, recycle, do not dispose of in bins
  • Not for cranking / starting
  • Do not dispose of in fire
  • Do not open case
  • Do not drop, impact or pierce

Before connection/disconnection, turn off the battery via the On/Off button Button position - down


To download the JK BMS app, search "JK BMS" in the Android Play Store or Apple App Store, alternatively click the links below. 
Note: If the button is off (down position), you will be able to connect via Bluetooth but no data will be displayed.

JK BMS App on the Android Play StoreJK BMS App on the Apple App Store


Battery Capacity


Battery Nominal Voltage


Maximum Discharge Current (30 minutes)


Peak Current (1s)


Trip Current (300s)


Maximum Inverter Size


Maximum Number of Parallel Batteries

Must be wired as per Figure 1

4 of the same model

Maximum Number of Series Batteries

Must be wired as per Figure 2

4 of the same model

Low Voltage Trip


High Voltage Trip


Balance Current










Mounting Orientation

Upright or long sides down

Nominal Continuous Charge Current


Maximum Continuous Charge Current


Absorption Voltage

14.0 - 14.2V

Float Voltage


Cycle Life (0.3C)

>3000 100% cycles at 25C

to 70% Capacity within 5 years

Case Material



M8 Bolt - 10mm depth

Terminal Torque

14Nm Max (12Nm Recommended)

Capacity Measurement

14.6V to 10V at 0.3C at 25C

Operating Temperature Charging

Operating Temperature Discharging

Operating Temperature Storage

5C – 45C

-20C – 55C

-20C – 60C

Ideal Storage Conditions

25C, 40% SoC (approx. 13V)

Battery Ventilation Required

10mm Clearance on all sides

Wiring Notes

Parallel wiring example 1Parallel wiring example 2

Figure 1 - Parallel Wiring

It is essential that all loads and chargers from the batteries evenly distribute current through the batteries, otherwise the batteries will not wear evenly, and excessive differences may cause a battery to fail under heavy loads, such as a large inverter loading one battery most. If using an inverter or charger greater than a single battery is rated for, it is recommended that a third battery is installed, reducing the risk of a cascading failure mode.

Showing Victron Battery Balancers connected to 4x Exotronic 200Ah batteries in Series

Figure 2 - Series Wiring with Balancers

Never wire Any loads from the 12V, 24V or 36V terminals, if other voltages are required, you must use a converter, i.e. a 48/36, 48/24 or 48/12 converter across the string of batteries. Battery balancers serve two purposes:

  1. Keep batteries balanced: Each two sets of batteries will be monitored and if a voltage difference appears, the balancer will move the charge from one battery to the other
  2. Alarm if out of balance: If the voltage difference is too great, battery balancers will make an audible alarm to allow you to intervene before damage to the batteries occurs.