Vapcell Opus BT-C3100 V2.2 4-Slot Smart Charger
https://www.everzon.net/vapcell-opus-bt-c3100-v2-2-4-slot-smart-charger.html

The Vapcell Opus BT-C3100 V2.2 4-Slot Smart Charger integrates the minus delta voltage for NiCd or NiMh battery charging termination, and for Li-ion batteries charging to 4.2V with pre-selected constant current. (3.7 Li-FeO4 and 4.35 type high voltage batteries charging mode can be selected through switch on board) Easy to read LCD with back light Showing Battery Voltage, Charge/ Discharge Current, Charging Time and Battery Capacity etc.

Parameters:
Operating temperature: 0- 40℃
Current deviation: Max 5%
Voltage deviation: Max 0.03V 4.2V
Input Voltage: AC 100- 240V 50/60HZ
Output Voltage: DC 12V, 3.0A
Product size (Lx Wx H): 14.4x 9.8x 3.9cm
Max charging capacity: Up to 20000mAh
Power adapter: DC 12V, 3.0A (Output), 100- 240V, 50/ 60Hz (Input)
Charging current range (mA): 200, 300, 500, 700, 1000, 1500, 2000
Discharge current range (mA): 200, 300, 500, 700, 1000 (li-ion cell battery only)

Features:
Voltage update rate is 30s instead of 60s.
35V charging algorithm is changed to 4.27V.
4.35V charging time can be very long because charging current is regulated in entering the CV stage at 4.12V, which is same as 4.2V type.
New fan cover make better protection for cooling fan.
LCD Screen
Auto Circuit Detection
Built-in Protected Circuit
Over Voltage Protection
Short-Circuit Protection
Over-Charging Protection
Over-Discharging Protection

Packages:
1* Opus BT-C3100 V2.2 Charger
1* Power Adapter
1* User Manual