What is a backpack battery?

A backpack battery is a mobile, self-contained power source worn on the back using a harness or ergonomic fastening system. It provides the power needed to operate power tools such as hedge trimmers, chain saws, brush cutters, blowers and many others.

The different types of batteries for garden tools :

To characterize a battery, we look at the technology that makes it work. Today, lithium-ion batteries are most commonly used, but this wasn't always the case.

Lithium-ion battery (Li-Ion)

Lithium-ion batteries work by exchanging lithium ions between positive and negative electrodes.

• What are the advantages of a reliable lithium back-up battery?

Prized for their light weight, they are also renowned for their low self-discharge and ability to provide a constant power supply even at the end of a charge. They are less sensitive to self-discharge, which means they retain their charge even when not in use for long periods. This makes them ideal for gardening tools, where prolonged storage is unavoidable. However, their cost is higher than that of older, less efficient technologies.

They are also less susceptible to memory effect, which extends their useful life.

Naturally, back batteries are exclusively based on Lithium-Ion technology, as they are designed for intensive, professional work.

Nickel Cadmium (Ni-Cd) battery

Ni-Cd batteries were commonly used before the advent of Li-Ion technology, but they are gradually being replaced by more advanced technologies due to their memory effect (loss of energy capacity after a succession of partial recharges), higher weight and greater environmental impact.

Nickel Metal Hydride (Ni-Mh) battery

Ni-Mh batteries offer an environmentally-friendly alternative to Ni-Cd batteries. They have decent energy storage capacity and are less prone to memory effect, which means they can be recharged more often without significant loss of capacity.

Battery history :

The beginnings of backpack batteries date back to a time when the mobility of hand-held power tools was still a challenge. Initial prototypes were often cumbersome, limiting practicality. In the 2000s, these first back-up batteries found their way into specialized sectors requiring a mobile power source, but their adoption was limited by weight and performance constraints.

The first generations of backbone batteries used lead-acid technologies. Although they offered constant power, they were heavy, limiting users' freedom of movement and posing recycling problems.

As technologies have evolved, nickel-cadmium (Ni-Cd) and nickel-metal-hydride (Ni-MH) batteries, followed by lithium-ion in the 2010s, have become the predominant choices, not least because of their reduced weight. Their adoption has spread to a variety of sectors, from gardening to construction applications.

How do batteries for hand-held power tools work?

Discover the basics of this rechargeable power source and understand the crucial role it plays in tool efficiency. Whether you're a professional or a do-it-yourselfer, this understanding is essential to optimizing the use of your equipment.

What is the role of the main components?

In a battery, each component plays an essential role in ensuring proper operation:

• Fixing harness

The harness holds your device in place on your back, ensuring comfortable wear for long periods. Some models also allow you to attach accessories. Some harnesses can be clipped to your belt.

• Handle

The backpack battery is fairly heavy (around 8 kg), which is why it's a good idea to wear it with a harness. It's also a product that can be damaged if dropped, despite the protective casing, because it incorporates sensitive electronics. The handle is therefore an important element, and must be ergonomically designed to minimize the risk of bumps and falls when handling the battery.

• HMI or "Human Machine Interface

An HMI is a system or device that enables communication and interaction between man and machine. A battery's HMI generally takes the form of a small, reinforced screen, with or without control buttons, which provides simple indications of the battery's status (state of charge, for example).

How to choose a reliable backpack battery?

Discover the essential criteria for choosing the backpack battery that meets your needs. This section will guide you through the key elements to ensure the reliability of your outdoor power source.

It's imperative to look at sustainability criteria. Constantly evolving, these criteria not only guide users' choices, but also play an essential role in promoting responsible consumption. Let's take a closer look at the elements that define backbone battery durability, a crucial aspect in today's era of environmental responsibility and long-term quality.

Battery cell matrix reliability

The bonding system between the battery cells plays a very important role in the reliability of the cell array. It must be adapted to the size of the battery and be resistant to applicable mechanical stresses (micro-shocks, vibrations). Magnetic connections between cells are preferred to springs and welding. At present, the balancing between the battery cells is so sensitive that if one cell malfunctions, the entire cell pack has to be replaced, hence the importance of preserving each individual cell. Technologies for this type of product are constantly evolving, and we hope that the reparability of backbone battery cell matrices will soon be improved.

Reliability of electronic components

The reliability of internal components is crucial to the life of your battery. Make sure the components are of high quality and able to withstand prolonged use in harsh conditions.

Choose brands renowned for the quality of their components.

Efficient management by BMS electronic board

The BMS electronic board is the brain. It regulates energy distribution and can affect overall performance. Look for backplane power supplies equipped with electronic cards that manage all relevant battery information, at a minimum: resistance, current, internal voltage, remaining capacity, number of charges/cycles, cell temperature values. The BMS card should also prevent deep discharge of the battery's cells, which should continue to function despite a year's non-use.

Robust, durable materials

Manufacturing materials play a major role in its robustness and durability. Choose housings and components made from materials resistant to shock, humidity and temperature variations. This will ensure a durable power source that can withstand the rigors of outdoor use.

Cooling system

An efficient cooling system can extend service life by maintaining optimum operating temperature. Battery performance is greatly affected over time by cell temperature. The aim is to find a battery whose technology strikes the right balance between resistance to impact and external intrusion, and efficient ventilation. This is because the battery's internal components generate heat which must be dissipated to the outside. However, heat dissipation paths can, conversely, let in impurities or liquids. It's also worth taking a look at the casing, as some are made from materials that facilitate heat dissipation, while also being robust.

Quality-price ratio of back batteries:

When making your choice, don't settle for the cheapest. Look for products that offer excellent value for money, i.e. that combine high build quality, reliable performance and durability at a reasonable price. Compare features and benefits to get the best value for your money. Don't be afraid to check stock at several distributors!

Battery performance criteria :

These criteria are the pillars that determine operational efficiency, performance maintenance over time and user satisfaction. In this section, we take a close look at these criteria, offering a comprehensive guide for those seeking optimal, sustainable energy solutions for their handheld power tools.

Battery capacity, voltage and power

• Capacity

Energy storage capacity determines how long you can use it before needing to recharge. Higher capacity means longer use, which can be crucial for longer jobs or when the tool needs more power. Make sure the battery capacity matches your needs.

• Voltage

Check that the power supply voltage is compatible with the voltage requirements of your tools. Inadequate voltage can adversely affect performance.

• Power

A battery with the right power rating for the power tool can make all the difference to performance and user satisfaction. In fact, the right Li-ion battery guarantees a constant, reliable power supply, which means smooth, uninterrupted tool operation. This enables professionals to complete their tasks faster and more accurately, while reducing downtime. Matching battery power to the power tool also helps to extend tool life. Li-ion batteries are sensitive to charge and discharge cycles. An oversized or undersized battery can cause premature wear of the tool or the battery itself.

Energy efficiency is a key factor to consider too. An oversized battery can waste energy, while an undersized battery may require frequent recharging. A Li-ion battery adapted to the power tool enables optimal energy use, reducing overall power consumption and improving overall performance by optimizing the frequency of recharges.

Autonomy and charging time

The autonomy of your electric product depends directly on the autonomy of its battery. One of the big advantages of backpack batteries is that they offer much greater autonomy than removable batteries built into tools. This is due to the fact that back batteries are larger, so they can accommodate more cells to store energy.

However, battery life depends on many factors, and it's impossible to define good or bad battery life. To make a comparison, we need to have a usage scenario (mowing 2000m2) and then check the autonomy of two different models.

• Charging time

The time it takes to recharge can have an impact on your productivity. Choose a power source with a reasonable charging time to minimize downtime. This time is completely dependent on the charger and its compatibility with the battery.

• Quick-change system

A quick-change battery system on the tool makes it easy to replace the battery with a fully-charged one without wasting time. This feature is particularly useful if you need to work for long periods without interruption.

• Fast charging

Fast charging allows you to recharge your product more quickly as required, minimizing downtime. Some ranges include this feature, and some adapters will also provide faster charging.

• Compatible with various tools

Battery compatibility with different tools gives you maximum flexibility, allowing you to use the same power source for a variety of tools. Make sure it's compatible with your entire arsenal of tools. You should also pay close attention to your adapters.

• CCA of a battery (Ignition peak current)

The CCA measures the ability to deliver a high instantaneous current, which can be crucial for powerful starting of certain tools. Choose a CCA tailored to your specific needs.

Additional features and options

Beyond the basic features, back accumulators can offer a range of additional options and functionalities.

These additions are designed to enhance the user experience, increase efficiency and integrate innovative elements. In this section, we'll explore the additional options and features that are helping backbone batteries evolve into smarter solutions, better adapted to the specific needs of demanding users.

• Overcurrent protection

Overcurrent protection is essential to ensure the safety of your tools. It prevents damage caused by sudden power surges. Make sure your product offers this security feature.

• Charge level indicators

Charge level indicators let you easily monitor the amount of energy remaining in your power source. This helps you plan your work more efficiently and avoid unexpected interruptions. With this, you'll know how many minutes before you need to think about recharging! This also avoids unnecessary charging of a battery that has already been charged, at the risk of damaging it.

• Bluetooth connectivity

Bluetooth connectivity lets you control and monitor from your smartphone or tablet. It's a handy feature that offers remote control and tracking capabilities.

• Accessory pack

Some electrical products are delivered with a package of accessories designed to provide you with greater ease of use and mobility. For example, some accessories allow you to attach parts to your belt, while others offer adapters for other manufacturers' ranges. It's up to you to compare stocks and the different ranges available on the market.

How do you make your backpack battery last as long as possible?

A reliable back-up battery is a valuable investment, and to get the most out of it, it's essential to maximize its lifespan. Knowing how to properly maintain and use your power source is the key to ensuring optimum performance over the long term. We'll give you some valuable tips in this section.

How to use a backpack battery:

Optimal use of your tool goes beyond simply logging on and off. To get the most out of them, it's crucial to understand the practices and tricks that maximize efficiency while preserving battery life. In this section, we'll explore how to use a back-up battery wisely, ensuring reliable performance and an optimal user experience.

• Tips for using a backpack battery :

As with all products, following the instructions for use is a prerequisite for extending product life. So it's vital to take the time to read the information the manufacturer provides. Check out our general tips for using your tool!

• Initial load :

Before using for the first time, be sure to fully charge the battery according to the manufacturer's instructions. This will allow the battery to be calibrated for maximum charge.

• Appropriate use:

Use only with compatible tools and equipment. Make sure the battery voltage and capacity match the requirements of your tools.

• Load management :

Avoid letting your machine discharge completely before recharging. Recharge it as soon as you notice a significant drop in power. Also avoid overcharging by leaving the charger connected for long periods. Make sure you have enough energy for the job! When recharging, make sure the ambient temperature is within the range recommended by the manufacturer. Unlike combustion engine equipment, extreme temperatures can have a negative impact on the load capacity of electrical products.

• Suitable storage :

When not in use, store in a dry place at room temperature. Avoid exposure to extreme temperatures, humidity or direct sunlight. Storage accessories are available from some manufacturers.

• Autonomy control :

Keep a close eye on the autonomy during use. If you notice a significant drop in autonomy, this may indicate that your product is reaching the end of its useful life and needs to be replaced, or that you are not fully respecting the correct conditions of use (storage environment, charging time, type of charger...).

• Safety :

Follow the safety instructions provided by the manufacturer, especially when handling the battery and equipment. Avoid dropping your equipment or subjecting it to physical shocks.

Care and maintenance

As well as complying with operating conditions, ensuring long life and optimum performance from back-up batteries requires a well-thought-out approach to care and maintenance. In this section, we'll explore key practices for maximizing the reliability of your backpack battery, promoting long-lasting, efficient use.

• Regular cleaning

Regular cleaning is essential to keep it running smoothly. Remove any dirt, dust and debris that may obstruct internal components. Use a soft, dry cloth to clean the outer surface. .

• Occasional calibration

Occasional calibration can help maintain power source accuracy. Follow the manufacturer's instructions to calibrate your power source where recommended.

• Cable inspection

Regular inspection of power supply and connection cables is essential to prevent electrical problems. Look for signs of damage, tears or loose cables. Replace faulty cables as soon as possible.

• Visual inspection

Periodic visual inspection of your power supply may reveal early signs of problems. Look for cracks, dents, deformations or other visual anomalies. If you notice anything unusual, consult the manufacturer's manual for advice on troubleshooting.

How to repair your back battery?

Backup batteries, although extremely reliable, can sometimes require repairs to restore their performance. Knowing how to diagnose and solve common problems can save you unnecessary replacement costs. Follow the guide!

Troubleshooting and solutions to common problems

In general, it's important to follow the manufacturer's instructions and take appropriate safety precautions when troubleshooting problems with your backplane power source. Batteries are very dangerous products, requiring special skills to work on them. We recommend that you only contact competent professionals and do not carry out any work yourself.

If problems persist or worsen, do not hesitate to consult the manufacturer's customer service department or a repair professional for further assistance.

Remember to consult the technical data sheets and details provided by the store or manufacturer.

• What should I do if my battery won't charge?

If your tool no longer lights up or doesn't work when you call on it, your battery needs to be checked.

Solution:

1. First, check that the battery charger plug works. Plug in another electrical product, such as a lamp or phone charger, and check that it is powered.
2. If the plug works, check that the charger works. Some chargers have status indicators. Otherwise, you can use a multimeter to check that the charger is delivering voltage to its charging terminals.
3. Also check the charger and battery contactors for bent, broken or dirty contacts.
4. If the plug and charger work, make sure your battery is properly charged. If equipped with a charge indicator, check the battery status. If the battery is not equipped with a charge indicator, use a multimeter to check that it is delivering voltage.
5. If the battery delivers no voltage or too low a voltage, your battery is faulty.
6. If the battery, charger and plug work, it's most likely that the problem lies with the tool itself.
7. If your battery is interchangeable, check on another device whether it works or not.
8. If your power supply is equipped with a safety system, make sure it is correctly activated. Some have safety interlocks to prevent accidental starting.

• My battery overheats:

An overheated back-up battery can be dangerous and signals a problem in its charging or operating system. Here's how to solve the problem:

Solution:

1. Immediately switch off the power source and disconnect it from your tools.
2. Place it in a safe, well-ventilated place to allow it to cool.
3. Check for obstructions around fans or power supply ventilation openings.
4. Remove any dirt or debris that could impede air circulation.
5. If the problem persists, contact your dealer or technical support.

• Battery does not hold a charge:

If it discharges quickly or doesn't hold a charge as long as it should, here's what you can do:

Solution:

1. First, check your charger and power supply.
2. Ensure that the battery has been charged for a sufficiently long time, in accordance with the manufacturer's recommendations.
3. Avoid letting it discharge completely before recharging.
4. Regular recharging can extend its useful life.
5. Check whether any unnecessary applications or functions are running, as these can drain the battery unnecessarily.
6. If it's old or damaged, it may be time to replace it with a new one.

Battery emitting unusual noises :

If your product makes strange or unusual noises, this may indicate a potential problem. Here's how to remedy the situation:

Solution:

1. Switch it off immediately and disconnect it from your tools.
2. Check for signs of overheating or visible damage.
3. If the noise is coming from the ventilation system, check for obstructions inside. Clean if necessary.
4. If the noise persists or you suspect an internal problem, do not attempt to repair it yourself. It's best to call in a qualified professional for inspection and repairs.