Xtar VC4 Charger for Cylindrical Li-ion and NiMH Batteries

Key features:
- Li-ion battery charging with processor-controlled three-stage TC/CC/CV charging process
- Ni-MH battery charging with CC method
- Four independent charging channels
- Max. charging current 1A
- LCD display showing cell voltage and charging current
- Informs about the current used for charging - possibility to measure cell capacity (measurement error ±5%)
- Powered by any USB charger with a USB socket or from a computer's USB port
- Deeply discharged cell reactivation function
- Protections: short-circuit, thermal, reverse polarity
VC4 is a professional processor charger with a three-stage TC/CC/CV charging process and an LCD display. It charges 1-4 Li-ion 3.6 / 3.7V and Ni-MH cells of any capacity in sizes AAA/R03, AA/R6, 10440, 14500, 14650, 16340, 17500, 17670, 18350, 18500, 18650, 18700. In the two extreme channels, it is possible to charge batteries in sizes R14, R20, 20700, 21700, 22650, 25500, 26650, 32650.
The backlit LCD display of the Xtar VC4 charger shows current information about the charger's operating status: voltage of the charged batteries, charging current, charge used to charge the cells, indicates possible errors and informs about the end of charging. At the same time, the current operating status for two channels is displayed. Switching between the other two channels is possible using the CH button on the charger housing. Information about the charge used can be used to measure the capacity of batteries. To measure the capacity of the battery, it should be discharged to the voltage cut-off level appropriate for it (usually 2.5V for Li-ion, 0.9V for Ni-MH) and inserted into the VC4 charger. After charging is complete, the value of the charge used to charge the battery can be read from the display. This will always be a value 3-5% higher than the actual battery capacity. This is due to the fact that the battery charging process is never 100% efficient, i.e. a slightly larger charge is needed to charge the battery than results from the actual cell capacity.
The maximum charging current is 1A and is only available for the two extreme channels and only when the middle channels are not used. Batteries in the middle channels are always charged with a current of 0.5A. When charging 3 or 4 batteries, the VC4 charges all batteries with a current of 0.5A.
The Xtar VC4 charger has a function of reactivating deeply discharged cells and cells with a voltage of 0V. Many chargers on the market are not able to charge such batteries. Here, the Xtar VC4 charger comes to the rescue, which in many cases allows you to 'rescue' such cells. Just insert a deeply discharged battery into the VC4 charger, as with normal charging - the charger will detect the discharged cell and attempt to reactivate it. Warning! Cells discharged below a certain level are irreversibly damaged and their reactivation may not be possible. Avoid over-discharging Li-ion and Ni-MH batteries - this can lead to a significant reduction in their durability and capacity or lead to their complete failure.
The Xtar VC4 charger comes with a USB cable. The set does not include a power adapter. To power the charger, any charger with a USB cable, e.g. from a phone, or a USB socket or a computer with a free USB port is sufficient. The recommended power of the USB power adapter is 2.1A (2100mA). It is possible to use a weaker power adapter, the VC4 will adjust the charging current to the capabilities of the power source.