Cordless Tools: Charging Times, Tips and Technology

Why batteries are being used more and more frequently in tools

In the past, many tools relied on power supply via cable or petrol. But nowadays, more and more devices, from lawnmowers to cordless screwdrivers, rely on the practical solution with batteries. Battery-powered tools are very popular, especially among DIY enthusiasts and professionals, as they offer significantly more mobility due to their flexibility and independence from power outlets.

Six tips for using batteries

Before we deal with the charging times of batteries, here are a few tips on how to get the most out of your batteries:

• Buy two batteries: This way, one battery can be charged while the other is being used.
• Use fast chargers: A fast charger significantly shortens the charging time.
• Smaller batteries charge faster than large ones: If you only need a short working time, a smaller battery is usually charged faster.
• Battery runtime varies: The runtime depends heavily on the device, the area of application, and the duration of use.
• Batteries lose performance over time: Lithium-ion batteries have a lifespan of about five years, depending on the frequency of use.
• Look up the charging time in the technical data: Manufacturers often state the charging times for their batteries and chargers.

Charging time of batteries: How long does it really take?

The charging time of batteries depends on various factors, such as the capacity of the battery and the charger used. You can calculate the charging time yourself using the following formula:

Charging time = (Battery capacity in mAh) / (Charging current in mA) * 1,3

You can usually find the battery capacity on the battery itself and the charging current on the back of the charger.

Note: This formula gives you a rough estimate of the charging time. In practice, chargers can use different charging methods, such as fast charging, which can shorten the charging time. In addition, the temperature and condition of the battery can influence the actual charging time.

Example of charging times for Makita 18-volt batteries:

The following charging times apply to the chargers DC18RC and DC18RD:

• 1,5 Ah: 15 Minuten
• 3,0 Ah: 22 Minuten
• 4,0 Ah: 36 Minuten
• 5,0 Ah: 45 Minuten
• 6,0 Ah: 55 Minuten

Technology of batteries: What types of batteries are there?

In the world of batteries, there is a variety of technologies. Some older battery types have now been replaced by more powerful models that both reduce charging time and increase endurance.

Currently, Lithium-ion batteries are the most common and powerful batteries on the market. They offer high energy density and are more efficient than their predecessors. The Lithium-ion battery was introduced to the market in 1991, although basic research on these batteries was already conducted in the 1970s.

Battery storage tips:

Batteries should be stored in a cool, dry place, ideally at temperatures between 15 and 25°C. Avoid direct sunlight or storage in very hot or cold environments, as extreme temperatures can shorten the battery's lifespan. It is also advisable to charge the battery to about 40-60% of its full capacity before storing it – this prevents deep discharge or overcharging, which could damage the battery. Make sure to check the battery regularly if you are not using it for a long time and recharge it if necessary.

How likely is spontaneous self-ignition?

In the media, one repeatedly hears reports of exploding batteries in devices like smartphones or headphones that were damaged by overheating. However, such incidents are rare and usually happen with cheaper devices that do not have the necessary safety technology.

With high-quality batteries, such as those from established manufacturers, the risk of spontaneous self-ignition is very low when used and stored correctly. The most important thing is to always observe the manufacturer's recommendations when charging and storing your batteries.