Battery Failsafe Devices

 Low Voltage Battery Alarms

A division of MTR Design

PO BOX 1555

Santa Barbara, California 93116 

For information and ordering, call 805-683-9684

or email:


15 years of Service

Keeping you informed


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 LCD Low Battery Alarm

Monitors battery voltage from +12 to +48 volts


The next generation of Battery Support Systems for all battery types.

Battery Failsafe Devices™ has introduced products to meet the needs

of running a battery voltage too low. With a wide range of settings, we’ve got you covered!

The device comes with a large LCD voltage readout and L.E.D. indicator along with buzzer to warn of low voltage.

Multi-color L.E.D. configurations indicates the battery status.


Microprocessor controlled Low Battery Alarm for all battery systems.

This device will monitor your battery voltage and warn you of unsafe levels.

The Low Battery Alarm is completely user adjustable with 9 low voltage settings to support your battery voltage needs.

 $59.95 each + shipping




Current draw of only +2.0 milliamps

Easy to read LCD voltage read out

Nine easily adjustable low voltage alarm settings

Senses voltage when connected to battery source

Loud audible alarm with LED visual warning

Prevents battery failure and battery cell damage

6 foot DC power cord

Optional relay switching control available

Optional remote LED warning lamp

Optional remote 105dB buzzer

Mounting tabs for best viewing location

1 Year Warranty


Click HERE to download the settings information (PDF)


Uses for the Low Battery Alarm are:


-Battery Backup Systems

- RV house batteries

-Trolling motor battery

- Marine batteries

- Auxiliary Power Units (APU)

- Travel trailers

- Power gate backup battery

- Generator battery

- Battery backup safety equipment



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Low Battery Alarm XL 

Alarm XL is an all-new Micro Processor Controlled Low Battery Alarm.

Now can be configured from +6 volts to +24 volt applications. 

Our Alarm XL gives off a loud 4-sequence tone, along with the LED lamp turning from green to flashing red. 

Measures 1 ˝ X 2 with mounting ears.

$29.95 each + shipping



Please contact us about custom configurations to meet your needs 

Please click here to email us with any questions or comments. 


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 Copyright 2014 MTR Designs