At Dextera we have provided some answers below to the most frequently asked questions from our customers. If you need to know something that isn’t covered here then please give us a call on (+44) (0)1675 465 191.

The Battery Brain is an electronic battery monitoring system designed to constantly monitor battery voltage over time.
Battery Brain sends out a pulse every two seconds to the car battery that senses the voltage level. When the level falls below what is needed to start the engine, the patented microprocessor activates its single moving part (a solenoid) and isolates the battery from the electrical circuit to preserve the charge you will need to start the engine.
Battery Brain works on virtually any vehicle using a battery; custom or classic cars, lorries, vans , SUVs, busses, coaches and boats. Almost any vehicle can benefit from the protection of the Battery Brain.
Depending on what model you have there are several different ways to reconnect to the electrical system.
The Bronze (Type I) has a manual reconnect. All you do is lift the bonnet, unscrew the yellow cap and press the reconnect button. (All models have a manual reconnect option, however this will be phased out on some models over time.)
The Battery Brain Gold (Type III) has the manual reconnect option and a remote control to reconnect and disconnect. Since you are able to disconnect the unit it can be used as an anti-theft device.
Once you leave your vehicle simply press the disconnect button and it can’t be hotwired or stolen.
The Gold Push Button(Type IV) has a manual reconnect option and a wired push button reconnect and disconnect option. The wired push button micro switch can be mounted anywhere you choose.
The Gold Leisure (Type IV) is specifically made to protect 12v RV (recreational vehicles) or coach batteries. Since it may not be responsible for starting a vehicle the charge protected is at a threshold of 10.5V. It avoids the discharge and recharge cycles that can significantly reduce battery life.
Battery Brain Heavy Duty (up to 2000 amps) has the manual reconnect option and a remote control to reconnect and disconnect. Also has a wired switch / cab light with a 60 second warning before cut off.
Bronze (Type I)
-Automatic battery disconnect only
Manual reset button
-Single black ground wireGold (Type III)
-Auto battery disconnect
-Manual reset button
-Dual button remote control toggles between connected and disconnected.
-Black ground wire
-White antenna wireGold with Push Button (Type IV)
-Auto battery disconnect
-Manual reset button
-Removable wired push button switch toggles between connected and disconnected.
-Black ground wire
-White antenna wire
-Red / black remote switch wiresGold Leisure (Type IV)
-10.5 voltage disconnect threshold
-Auto battery disconnect
-Manual reset button
-Wired push button switch toggles between connected and disconnected.
-Black ground wire
Red / black remote switch wireHeavy Duty
-Auto battery disconnect
-Manual reset button
-Removable wired push button switch toggles between connected and disconnected.
-Black ground wire
-White antenna wire
-Red / black remote switch wires
-Maximum peak amperage 2000 amps
-Wired switch / cab light, 60 second warning before cut off.
See our products page for further details.
Installing the Battery Brain is easy for anyone with a basic working knowledge of their vehicle. If you are not familiar working on your vehicle you may want to contact a qualified technician. All models come complete with a mounting hardware accessory kit and full installation instructions.

The high voltage disconnect will disconnect the battery when it reaches a preprogrammed voltage above the low voltage disconnect, this feature can be enabled upon ordering your Battery Brain.

The Battery Brain will disconnect your battery automatically if it detects the battery voltage has fallen below 11.8V (for the 12V units) and below 23.7V (for the 24V units), continuously for 30 seconds. This will allow you enough charge to start your motor. Battery Brain is responsible for preventing the deep cycling of your battery which will prematurely end the battery’s life. The Battery Brain Gold Leisure’s threshold is 10.5 V.
No, all Battery Brain models have the ability to preserve memories and preset options (e.g. – Clock and radio etc.) Simply attach the “accessory bypass” wire from the battery monitor unit to the appropriate fuse in the fuse box.
No, you must install the supplied “black engine on” wire for most Battery Brain models. This will ensure that Battery Brain does not disconnect while the engine is running. We also supply vibration sensors to simplify this process. We are continuing updates to always improve this product, please click here to find out more. Black engine on wire will no longer be supplied on newer models.
The vibration sensor can be used in place of the engine on wire to detect if the vehicle’s engine is running. Vibrations caused by normal vehicle operation are converted into a positive 12v signal which prevents the Battery Brain from operating.
Yes, we offer a one year limited warranty on every model.
Yes it does in a positive way by preventing the premature death of your vehicle battery. Battery Brain also reduces environmental impact by reducing the number of disposed batteries in landfills.
Operating Temp is – 60F to 257F
Base: 1 5/8” (4cm), Height: 2 ½” (6cm).
Weight: 175gm, (total package weight 408 gm, 1Ib).
Normal operation current consumption
For Bronze- 0 mA
For Silver and Gold- 3.8 mA
Yes, provided the battery does not exceed 1,100 Amps. Please see the website for the multi-battery configuration as shortly we will introducing specifications high amperage. We also have a Heavy Duty battery that runs at up to 2,000 Amps.
Yes. All Battery Brain Models are available in a 12V version and some models do have 24V versions. Please see our products page for further details.
Nothing. The Battery Brain “engine on” battery monitor circuit disables the Battery Brain from functioning while it is in operation.
If you feel there is a fault, please refer to your owner’s manual for information on the fault diagnosis procedures.
Aftermarket accessories such as vehicle security system can be connected directly to the input side of the Battery Brain, allowing them to operate regardless of the conditions of the battery. However, the aftermarket alarm is often the cause of the battery drain.
No, the Battery Brain installation kit provides chasis mounting hardware in the event the Battery Brain needs to be mounted in a remote location. Such as on the firewall or in the trunk (additional hardware maybe required).
The Battery Brain can be used on any application where protecting the battery is required.
Every time a battery is completely discharged, it loses some of its reserve capacity to hold a charge. Since the Battery Brain discharges before it disconnects your battery, it can extend the life of the battery.
Yes. Prior to jumpstarting the vehicle turn your Battery Brain to the off position. Follow the vehicle manufacturer’s instructions for jumpstarting the Battery Brain as normal.
Battery Brain works on all automotive batteries including lead-acid, spiral celled batteries and Gel-celled batteries.
The Battery Brain is designed to be installed on a new or nearly new battery. If you are unsure of the condition of your battery, please have it tested and replaced before installing the Battery Brain.

Battery Brain can be installed using standard handheld vehicle maintenance tools. If in doubt please consult an experienced technician to assist you.

IMPORTANT: Information you must know before buying a Battery Brain Product

Update Manual Reset Button to be Phased Out

Over the next 2 to 3 years the manual reset button is to be phased out, all models will be supplied with a flat top and an extra wire for manual reset.

Update Engine On Wire

Battery Prog Brain ERD (engine running detection)

ERD (engine running detection). With the programmable units the engine on wire is only needed if the ERD is not working.


Start the engine, press the remote control/push
button and hold for 10 seconds
If the power was not disconnected the ERD
works OK, if the power has disconnected
The ERD does not detect the electronic noise
You need to connect the “engine on” wire.