The UC4200 charger focuses on maximum compatibility - we can charge any Ni-MH rechargeable batteries in sizes: R6 AA, R03 AAA, R14 C, SC, R20 D and 9V batteries. In addition, the UC4200 also supports 3.6/3.7V Li-ion batteries, their high-voltage alternative - Li-HV, whose rated voltage is 3.85V and Li-FePO4 batteries. In the case of batteries based on Lithium, the charger will support such sizes as: 10440, 14500, 14650, 17500, 17670, 18350, 18500, 18650, 20700, 21700- also protected, 22650, 25500, 26500, 26650, 32650, 33600, 16340 R-CR123e . The maximum span of the sledge is up to 76mm, which will ensure the possibility of charging the increasingly popular 20700 and 21700 batteries in the version with electronic protection. 

Key features:

• four operating modes - charge, discharge, refresh, capacity test, - the last 3 functions are only available for channel 4 chargers
• very accurate measurement of internal resistance (IR) 
• support for all popular cylindrical cells - also the so-called FLAT TOP - with a flat plus and 20700 /21700 batteries with protection, the maximum length of the cell is up to 76mm!
• 0.00V battery resuscitation function - the charger can revive almost any battery,
• microprocessor-controlled intelligent, precise charging process CC / CV for Li-ion / Li-FePO4 and CC with dV / PVD for Ni-MH and 6F22 / 9V,
• support for protected cells (with PCB) and unprotected, also with a flat plus Flat Top,
• adjustable charging current for lithium cells: 4x 0.2A/0.5A/0.8A/1A/1.5A or 2x 2A (only for channels 1 and 4), for Ni-MH we have a choice of charging currents such as: 4x 0.2A/0.5A/0.8A/1A, for 6F22/9V batteries charging currents are 60mA or 120mA,
• discharge currents are 200mA / 400mA,
• large, readable display with backlight, shows all the most important values on an ongoing basis, 
• six independent charging channels: four channels for cylindrical cells and two channels for 9V batteries, with the possibility of charging individual batteries and unusual, odd combinations,
• a set of protections: against overcharging, against excessive discharge of cells, short-circuit, overload, thermal, against reverse polarity of cells.
• Li-ion/Li-HV and LiFePO4 batteries are charged very accurately using the CC/CV method with a termination of approx. 100mA. This guarantees full safety and full charging of any battery, even heavily degraded or low-capacity.
• Ni-MH and 9V batteries are charged using the CC method (constant current) with very precise dV / PVD detection - charging is completed only after reaching the maximum voltage on the battery (the value of this voltage may be different for each battery).

In addition, the charger has been equipped with a number of protections such as: 

• before recharging,
• against excessive discharge of cells,
• short-circuit / overload,
• Thermal,
• against reverse polarity of cells.