Battery Monitor | Bluetooth – Round 500A

Battery Monitor | Bluetooth – Round 500A

The BM21-500 Smart battery monitor is a high-precision meter that allows you to check the status of your battery via the display or your Smartphone with the smart battery monitor App.

Through the use of a 500A current shunt, the battery monitor measures the discharge or recharge currents and calculates the Ampere-hours(Ah) going in and out of the battery.

High-precision voltage measurements are taken and displayed in real-time through the use of a field-installed sense wire. BM21-500 battery monitor is compatible with all types of batteries, especially lithium, LiFePO4 batteries.


1 x Smart Bluetooth LCD Display. Approx 59mm OD
1 x 350 Amp (Cont.) – 500 Amp (Peak) Shunt
1 x 1m Extension Cable
1 x 1m Fused Battery sense wire
1 x Square plastic mounting plate
1 x Mounting hardware


3m Extension cable – BM21-3MC
6m Extension cable – BM21-6MC

Displayed Data:

  • Battery Capacity – Indicator
  • Battery Voltage – Indicator
  • Battery Current – Indicator
  • Battery State of Charge (SOC)% – Indicator
  • Charge & Discharge – Indicators

500A Shunt Specs:

Working Voltage8.0 120.0Volts
Working Disspation10.0 12.0mA
Standby Dissipation0.5 0.8mA
Sleep Dissipation50.0 60.0uA
Capacity Accuracy +/- 1.0 %
Voltage Accuracy +/- 1.0 %
Current Accuracy +/- 1.0 %
Backlight On Current40.0 50.0mA
Backlight Off Current40.0 40.0mA
Capacity Setting Value0.1 999Ah
Sampler Working Current50.0 500.A
Temperature Range02035Degree C


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Saturday: 8:00am - 1:00pm
Sunday: Closed

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All coast batteries have been Newcastle's leading supplier and installer of marine, automotive and recreational use batteries.

Business Hours

Monday to Friday: 8:00am - 5:00pm
Saturday: 8:00am - 1:00pm
Sunday: Closed