Li-Ion Chargers (For 3.7V High-Power Cells)

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Li-Ion chargers guarantee safe and fast restoration of power elements.

Special lithium-ion chargers, such as the L400 and L201 series, guarantee maximum safety for 3.7V high-power elements (18650, 21700, and 26650). They generate a stable current output (up to 1000mA for each channel), automatically stopping the process at the 4.2V threshold, thereby avoiding the risks of overloading lithium cells. The USB-C input and LED charge level reading provide freedom of action during travel, ensuring continuous power for tactical flashlights and portable equipment.

Physical and technical advantages:

4.2V limit: Fully protects rechargeable 18650 and 21700 blocks from damage.
High current: 1000mA channels accelerate the return of tactical flashlights to working order.
LED status diode: Clear green/red light indication of the cycle phase.

High-power lithium battery support guarantees that the internal resource of your tactical equipment will always be fully optimized. This is ideal engineering support for lighting systems, for example, preparing backup power for LED Work Lights operation at night. Safety standards require the use of only certified and tested elements in the equipment. Properly selected components that meet technical specifications significantly extend the operating cycle of the hardware in extreme working conditions. Careful selection of materials and engineering during the manufacturing process ensure maximum reliability and safety in all technical application scenarios. This analytical approach is fundamental to today's demanding industrial needs, where there is no room for error and where energy efficiency is always a primary requirement for any reliable system. This allows for significant resource savings in the long run, guaranteeing safety.

Q: What is the exact CC/CV (Constant Current / Constant Voltage) charge curve in 18650 and 21700 Li-Ion chargers?

A: In phase 1 (CC), the charger supplies a fixed direct current (0.5A, 1A, or 2A) until the cell reaches 4.20V, and in phase 2 (CV), the voltage is held at 4.20V while the current drops in steps. Charging is completely terminated once the current drops below 50 mA. This two-stage method prevents overheating of 3.7V lithium-ion cells and guarantees a maximum number of cycles.

Q: Why is it necessary to use chargers with an extended sliding contact and 2A current for charging large-size 21700 and 26650 Li-Ion batteries?

A: High-capacity (4000–5500 mAh) batteries require a larger charging current (1A–2A) so that the charging time does not exceed 3–4 hours. The mechanical terminals of VIDEX Li-Ion chargers provide up to 75 mm of travel, safely securing 21700 cells featuring a built-in protection board (PCB).

Q: Why is it critically important for Li-Ion chargers to provide a precise 4.20V (±0.05V) charge voltage cut-off?

A: Lithium-ion electrochemistry is extremely sensitive to overvoltage; exceeding 4.30V triggers electrolyte decomposition and gas evolution within the cell. A precise 4.20V cut-off threshold guarantees the cell's structural stability and prevents thermal auto-ignition risks.

Q: How does the 0V recovery function work in Li-Ion chargers when the battery's BMS protection has triggered?

A: When the voltage of a protected Li-Ion battery drops below 2.5V due to deep discharge, its internal PCB microchip disconnects the external contacts. The charger supplies a special micro-pulse voltage that unlocks the protection board and safely initiates the battery charging cycle from a zero state.

Q: What is the working life and safety parameters of Li-Ion battery chargers under continuous load?

A: Industrially tested electronic components ensure continuous operation of the chargers for more than 5 years. The chargers are equipped with protection against short circuits, overcharging, and overheating, complying with CE and RoHS safety directive requirements.