BlackCell BU4 USB Charger

BlackCell BU4 USB Charger


Out of stock

BlackCell BU4 USB Charger

BU4 is an intelligent charger, which combines convenience and fast charging into a single unit.

Charging times depend on each batteries current capacity, although the independent output (1A, 2A) and pulse charging circuit are compatible with any cylindrical Li-ion batteries (3.6/3.7v), Ni-MH and Ni-Cd batteries ranging in size between 10440 up to 21700. The BU4’s 3 LED display allows for clear viewing of the current charging status.



Input Voltage DC USB5V 2A
Output Voltage 1.42V+0.05V, 4.2V+0.05V
Output Current 500mA*4/1000mA*2/2000mA*1
Output USB 5V/1000mA
Charging Mode constant current and constant voltage
Constant voltage cutoff current <100mA
External power supply stand by current <15.0mA
Size 111mm*86mm*32mm
Weight 122.7g (Charger Only)
Compatible with IMR/Li-ion: 26650 22650 18650 18400 18350 17670 17500 18340 14500 10440 21700 20700
Input type USB


USB Output:

USB output load voltage: 4.90-5.30V
Output current: 1000mA
Floating current: <1mA
When load current is 1000mA, USB output voltage is 4.75-5.25V
Cutoff output protected voltage: 3.0±0.1V



Four, independent micro-controlled charging slots allow for simultaneous charging at 5V DC USB input.
Automatically distributed charging current (500mA*4/1000mA*2/2000mA*1), 2000mA for slot 4 only. 500mA is the default setting for charging Ni-MH and Ni-Cd batteries.
LED display charging status 30%, 70%, 100%.
Li-ion and Ni-MH Ni-Cd batteries are automatically detected.
0V voltage Activation capabilities. Trickle charge activated when the battery voltage is between 1.65-1.85V.
Faulty batteries and battery reverse connected batteries are automatically detected.
Charging mode: constant current and voltage.
DC input, the power supply is 5V 2A (Micro plug).
Automatically detected USB 5V/1000mA output function.
Certified by CE, ROHS, and FCC.
When no batteries are installed, the three LEDs will flash and then turn off one by one when the charger is connected to a power source.
When a bad battery is installed, the three LEDs will flash at the same time.
During the charging process, the three LEDs light up one by one, and will all stay lit until charging is completed.

Weight 0.16 kg
Dimensions 1 × 1 × 10 cm
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