Chargers For Batteries

A battery charger is essential for maintaining battery performance, extending battery life, and ensuring reliable starting power when you need it the most. Whether you are charging a car battery, maintaining a deep cycle battery, or supporting an off-grid solar system, using the correct battery charger helps protect your investment and improve its long-term performance.

Modern battery chargers are designed to suit a wide range of battery types, including AGM, lithium, EFB, and traditional lead-acid batteries. At Every Battery, we stock the widest range of battery chargers suited to various devices and applications, backed by over 15 years of expertise to help you select the right charger for your setup.

Find The Best Battery Chargers in Australia

The best battery charger is one that delivers the correct voltage and current for your battery, while adjusting automatically as the battery reaches full charge.

Modern smart battery chargers use multi-stage charging to safely restore and maintain batteries. In simple terms, charging occurs in controlled phases. The charger initially delivers maximum current during the bulk stage to bring the battery up quickly. It then moves to an absorption phase, where the voltage is maintained while the current gradually decreases as the battery approaches full charge. Finally, the charger enters float mode, where the voltage is lowered to safely maintain the battery without overcharging it.

This controlled process prevents sulphation, overheating, and excessive water loss in flooded batteries. It also ensures the battery reaches full charge, which is something that vehicle alternators alone fail to achieve. A high-quality battery charger will also help to counter natural self-discharge. Even when not connected to a load, batteries slowly lose charge over time.

Here at Every Battery, we stock high-quality battery chargers from trusted brands such as Victron and CTEK that offer reliable performance and long-term value.

Types of Chargers

Different types of batteries will require different charging methods. Understanding the purpose of each charger type will make it easier to select the right one.

Vehicle Battery Chargers

Vehicle batteries often suffer from undercharging rather than overcharging. Short trips, smart alternators, heavy electrical loads, and infrequent driving can all leave a battery partially charged.

While alternators maintain charge during driving, they are not designed to fully recharge a deeply discharged battery. Voltage drop through wiring, especially in dual battery systems, can also prevent the battery from reaching full charge. Measuring voltage directly at the battery terminals is the most accurate way to confirm the charging performance.

A dedicated vehicle battery charger, such as a car battery charger or motorcycle battery charger, allows the battery to reach full charge periodically, helping prevent sulphation and extended lifespan. For vehicles that are stored or driven occasionally, a smart charger with maintenance mode is particularly beneficial.

As a rough guide, most lead-acid batteries measure around 12.6 to 12.8 volts when fully charged and around 11.8 volts when fully discharged. Allowing the battery to remain deeply discharged increases the risk of permanent damage, so prompt recharging is recommended.

Deep Cycle Battery Charger

Deep cycle batteries are built for repeated discharge and recharge, but they must be charged correctly to achieve their full lifespan. Contrary to popular belief, deep cycle does not mean the battery can be flattened regularly without consequence. In fact, discharging a deep cycle battery too deeply or leaving it flat can reduce cycle life dramatically.

As a general guideline, a charger should provide at least 10% of the battery’s amp-hour rating. For example, a 100Ah battery should ideally be paired with a charger capable of supplying around 10 amps or more. If the charger is too small, the battery may never reach a full charge. If it’s excessively large for certain battery types, it can cause overheating or damage.

Charging voltages vary depending on chemistry. Most AGM and flooded lead-acid batteries charge between 14.4 and 14.6 volts safely during bulk and absorption. Gel batteries typically require a low bulk voltage, around 14.1 volts, while calcium batteries may require periodic higher equalisation voltages. Lithium batteries require a charger with a lithium or LiFePO4 profile to manage voltage correctly and protect internal cells.

As a rule of thumb, make sure to use a charger with temperature compensation, as battery voltage requirements change depending on ambient temperature. Warm batteries are normal during charging, but always avoid excessive heat and monitor the batteries to be safe.

General Purpose Chargers

Here at Every Battery, we stock a wide list of chargers for small batteries and consumer electronics that laptop chargers, mobile chargers, and powerbanks.

These chargers are designed specifically for their intended devices and should always be matched to the manufacturer’s specifications. Unlike automotive and deep cycle chargers, these products are typically pre-configured and do not require manual voltage or current selection.

Smart Chargers vs Traditional Chargers

Older style chargers deliver constant voltage or current and rely on manual disconnection. Without constant monitoring, this can result in overcharging, boiling electrolyte in flooded batteries, and cause plate damage.

Smart chargers continuously monitor battery voltage and adjust charging states automatically. They transition through bulk, absorption, and float phases, and many now include additional maintenance or pulse stages to reduce self-discharge.

For modern batteries, particularly AGM and lithium types, a smart charger is strongly recommended. It reduces user error and provides consistent, safe charging without constant supervision.

Battery Charger Compatibility

The compatibility between charger and battery chemistry is a crucial aspect. Gel batteries will require lower bulk voltages than AGM batteries. Lithium batteries require dedicated lithium charging profiles. Calcium batteries may benefit from periodic equalisation charging.

A solar charging system must always include a regulator or charge controller to prevent overcharging. While some solar panels include blocking diodes to prevent reverse discharge, this does not regulare charging voltage. Modern MPPT (Maximum Power Point Tracking) solar regulators can significantly improve efficiency, particularly if the panel size is small.

In combined systems that use solar, alternator, or generator charging, you will need to take careful measures to ensure it is set up correctly. Incorrect wiring or misconfigured regulators can lead to inconsistent charging or premature battery failure. When in doubt, use a high-quality automatic charger to periodically top up the battery.

Why a Quality Battery Charger Matters

Flattening a battery regularly can reduce its cycle life by a factor of three to ten times compared to maintaining it above 50% charge. Keeping batteries properly charged is one of the most effective ways to protect your investment.

A quality charger ensures that the battery reaches full charge, maintains safe float voltage, and avoids either undercharging or overcharging. Over time, this can reduce sulphation, preserve active material on battery plates, and extend overall lifespan.

In practical terms, a good quality charger will pay for itself by reducing the frequency of replacing your battery while also maintaining reliable performance.

Choosing the Right Battery Charger with Every Battery

Selecting the battery charger requires proper consideration of the battery chemistry, capacity, voltage, and system design. Whether you need a charge for your vehicle, caravan setup, or to support your home solar system, using the correct battery charger is essential.

At Every Battery, we stock the widest range of trusted brands, including CTEK, Victron, Projecta, and BMPRO. Our team has extensive experience dealing with various vehicle types, dual battery setups, solar installations, and deep cycle applications. Drop by your closest Every Battery store today to speak with a member of our team, and we’ll help ensure your charger matches your battery and application correctly.

Using the right battery charger consistently is one of the simplest and most effective ways to extend battery life and maintain dependable battery performance.

Battery Chargers FAQs