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BM-1 Bluetooth Battery Monitor


BM-1 Bluetooth battery monitor BM-1 (BT) Bluetooth Battery Monitor for Android*

When you need a battery monitor but don’t have space for the display or routing the cables would be a nightmare, there is now a solution. The BM-1(BT) will monitor your boat or caravan’s lead-acid batteries and transmit the data directly to your mobile phone, or tablet, wirelessly by bluetooth.

A simple Android app, freely available from the Google Play Store, (requires Android V4.3 or later) shows your service battery voltage, current flowing in or out, state of charge and time to charge or discharge the battery. An audible alarm warns if the battery level gets dangerously low. It will also show the starter battery voltage.

For Apple users third party simple, low cost optional apps are available here IOS Battery monitor OR here IOS NASA Battery monitor 

The monitor, which draws a meagre 2 mA, is supplied with a 100 amp shunt and a pre-made cable assembly to simplify connection to your service battery.

Android app – Google Play Store

Video – Andriod app


IOS App – App Store






Supply voltage 8 – 16 Volts DC

Supply current 2.0 milliamps

Battery capacities 5 – 600 AMP Hour

Load current 100 AMPS Maximum

Charge current 100 AMPS Maximum

Shunt Standard 50 millivolt @ 100 AMP (120 x 28 x 31mm)

Monitor unit with L.E.D’s  for power and data

Monitor dimensions 112 x 93 x 22mm

Minimum voltage visual alarm

Simple operation – Setup via App on phone or Tablet

What’s in the box

  • Monitor unit with L.E.D’s  for power and data
  • 100 AMP shunt
  • 1 Metre cable from monitor unit to battery – fused and fitted with ring terminals for shunt, fuse holder and M8 ring terminal to battery.
  • 100 AMP shunt link to M8 Ring terminal.
  • User Manual