Batteries and Chargers

At TechnoKing you can choose rechargeable batteries for various purposes, 18650 cells and universal chargers, intended for everyday as well as technical and professional use. When choosing the right battery, its type, size, voltage, capacity and compatibility with the specific device are important.

Rechargeable batteries

Rechargeable batteries are intended for repeated use. With a suitable charger their energy can be restored many times, which is especially practical for devices that are used often. When choosing a rechargeable battery, matching the size alone is not enough. The battery type, nominal voltage, capacity and the requirements of the specific device are important.

18650 battery

The 18650 battery is one of the common formats of rechargeable lithium-ion cells. The name is related to its physical size, and cells of this type are widely used in various portable and electronic devices. 18650 cells can be found in powerful flashlights, power banks, laptop batteries, power-tool batteries and other equipment. The LiitoKala and VariCore 18650 cells available at TechnoKing are of the Li-ion type and their stated capacity is 3000 mAh.

In a rechargeable battery’s description you will often come across an mAh figure — this gives us information about the battery’s capacity. In general, a higher capacity means a larger energy reserve, though the device’s actual running time also depends on many other factors. When working with lithium-ion cells, using a suitable charger is especially important.

Battery charger

For regular use of rechargeable batteries, a suitable battery charger is needed. Modern chargers are used not only for restoring energy. More functional models may have modes for discharging a battery, checking capacity, assessing internal resistance and others. When choosing a charger, you should first consider which type of batteries you intend to work with.

Universal charger

A universal charger is a convenient choice when you use rechargeable batteries of different sizes and types. Support for several formats in one device lets you reduce the need to buy a separate charger for each battery. However, the word universal does not mean that the charger supports every existing type of battery — before buying, you must check the supported chemistry types, battery sizes and operating modes. The Opus BT C3100 available at TechnoKing is intended for working with various types of rechargeable batteries and supports NiCd, NiMH and Li-ion cells (AA, AAA, 26650, 18650, 14500 and other formats).

Battery charger with a testing function

Sometimes the user does not only need to charge a battery. It is also important to determine what state the battery is in and how well it retains its capabilities. In this case a charger with a testing function is useful. A device of the SKYRC iMAX B6 Mini type is used for charging, discharging and checking batteries, for assessing their capacity and for obtaining data related to internal resistance. Such chargers are especially interesting for technology enthusiasts and for those who need more control over the charging process.

How to choose a battery charger?

When choosing a charger, first determine what type of batteries you have. Then check their size, chemistry type, nominal voltage and the charging conditions recommended by the manufacturer. If you use only one type of battery, a suitable simple charger may be entirely sufficient. If you have batteries of several different formats, a universal charger may be more practical. And if you also need periodic monitoring of the batteries’ condition, it is advisable to choose a device that has capacity-checking and other diagnostic capabilities.

Battery capacity and internal resistance

Over time, a rechargeable battery may no longer retain its original capabilities. Even a battery that looks fine may discharge relatively quickly. In such a situation, checking the battery’s capacity will help you assess its real condition. One of the technical parameters in assessing a battery’s condition is internal resistance, which gives us information about how the battery behaves under load.

Spot welding machine for batteries

When building a battery pack from 18650 and other types of cells, a spot welding machine is often used. Such a device makes it possible to attach the appropriate contact material to the cell using the principle of spot welding. The FNIRSI SWM 10 available at TechnoKing is designed precisely for such work. Working with batteries requires the appropriate technical knowledge — an incorrect connection or a short circuit of a cell can create a safety problem.

Using batteries correctly

Buying a quality battery is important, though the conditions of use also affect its working life. You should use a battery only in a device whose technical requirements it meets. For charging, use a suitable charger and do not use a damaged battery. If a battery’s casing is damaged, the contacts are deformed or the battery heats up abnormally, continuing to use it may not be safe. You should be especially careful with lithium-ion cells.

Batteries and chargers at TechnoKing

At TechnoKing you can choose 18650 rechargeable batteries, universal chargers, devices with a battery-testing capability and a spot welding machine. You can choose LiitoKala and VariCore 18650 cells, as well as multifunction chargers of the Opus and SKYRC types. Before buying a product, review its technical data and check compatibility with the battery or device you plan to use it with.