The Basics of Battery Monitors and the Reasons You Need One

Car batteries do more than power the lights or turn on the heating. Modern vehicles rely on dozens of electrical systems and a backup power supply from a healthy battery to start the engine, run vital electrics and ensure a safe journey. Depleting or failing batteries not only hurt performance and drivability but can lead to compromised safety and dozens of issues costing thousands in repairs.

To ensure your car battery works as it should and remains topped up and healthy for longer, consider investing in a reliable 12V battery monitor. This affordable and compact wireless device connects to the battery and keeps an eye on battery health. The data it collects is conveniently beamed to your phone in real time, so you know whether the battery is charging, discharging or nearing its replacement date.

Battery Monitor Basics

Batteries require maintenance and periodic charging to stay on top of their game. A 12v battery monitor provides relevant health metrics so you’ll know exactly how the battery is holding up and whether you need a functional replacement. The device registers the state of charge, the terminal voltage, how much current is flowing in and out of the battery, the consumed Ampere hours, and temperature.

Monitors inform whether the battery is charging with the engine on, whether it is discharging (for instance running power to the starter or high-current electrics like the AC), how much voltage is left before it reaches dangerously low levels, instances of surges and electrical faults (such as faulty alternators, chargers or frayed wiring) and if the battery is overheating or leaking. Metrics outside recommended levels are accompanied by alarms and visual alerts. The goal is to extend the battery lifespan, ensure your unit stays topped up and can supply power when it’s needed.

How Monitors Work

Most monitors are voltage-based, meaning they constantly measure voltage to calculate the state of charge and how much power is draining from the battery to charge essential vehicle systems. Devices are simple to install, attach to the battery terminals or a compatible port and with enabled Bluetooth or Wi-Fi, send readouts to your phone via an app. Drivers can set thresholds for various metrics, with alerts or notification warnings when levels are exceeded. Apps are also intuitive and easy to use, with simple layouts, and legible readouts that cover all the basics.

Why You Want One

Practical, functional and simple to use, Wi-Fi and Bluetooth battery monitors aid you and your car in more ways than one:

• Real-time monitoring – monitors register instant changes in current, voltage and temperature to give you a good understanding of charging rates, current and overall battery health, and whether there are underlying issues with other car parts, such as the alternator, starter, wiring, or electrics like the car driving lights.
• Alerts and notifications – take active measures to extend battery life with the help of alerts and notifications. Monitors warn of overly low voltage, risks of engine stalling or downgraded performance, overheating and sulphating batteries that can corrode vital vehicle systems, and possible safety issues.
• Timely replacements – most batteries have 3 to 5-year lifespans, depending on how and where you drive. Monitors inform of advanced wear, deteriorating battery health and the need for a new unit. This spares drivers from being stranded in the driveway, carpark or roadside.
• Savings – save money on unexpected replacement batteries, towing services, vehicle repairs (alternators fail soon after a dead battery) and the time lost in procuring a functional battery.
• Ease of use – monitors and apps have a berth of useful data, yet aren’t overwhelming. Simple interfaces and timely alerts across all smartphone platforms are easy to use and understand even for newbies.

Features to Look For

While all monitors provide basic voltage and current data, added features and functionality mean money well spent. Additional features to look for include:

1. Crank testing – the cranking mode test determines whether the battery has enough power to turn over the crank and start the engine.
2. Charge testing – monitors inform of the charging voltage at idle and at higher RPMs. This ensures drivers that the charging system is in working order.
3. Historical data – be informed about voltage levels, charging, and discharge rates, battery temperature, and multiple metrics over chosen periods. Drivers are aware of changing patterns and can take suitable measures to prolong battery life.
4. Safety features – choose a 12 Volt battery monitor with short-circuit protection and the ability to protect vehicle systems during electrical surges.
5. Monitoring multiple batteries at once – utes, campervans and other vehicles rely on deep-cycle batteries for additional power. Go with a monitor that can monitor voltage and charge rates in multiple batteries in a single go.
6. Compatibility – ensure lead-acid, AGM or lithium batteries get the charge they need and can supply your car, caravan or campervan with power and a monitor calibrated for your battery type.
7. Bluetooth range – newer Bluetooth formats allow monitors to be used at greater distances. This means no issues when monitoring batteries in towed vehicles, or observing battery condition in parked vehicles.