The ISDT C4 EVO is a versatile smart battery charger built for AA, AAA and cylindrical rechargeable cells from compact 10440 batteries all the way up to large 26700 cells. Its multi-channel design, intelligent battery detection, real-time monitoring and advanced maintenance modes make it much more than a basic 18650 battery charger.
Supporting NiMH, NiZn, Li-ion, LiFe and LiHV chemistries, the C4 EVO can charge, discharge, store, cycle, analyse, activate and even perform controlled battery-destroy tasks. A full-color IPS screen displays voltage, current, capacity, elapsed time, internal resistance, temperature and charging curves in real time.
6-Channel Smart Charging for AA, AAA and Cylindrical Batteries
The C4 EVO uses a six-channel charging architecture designed around multiple vertical and horizontal battery positions. Each channel can operate independently, allowing different supported battery types and tasks to be managed within the same charging session.
Actual simultaneous battery capacity depends on cell size and slot orientation. The charger supports up to four cylindrical batteries at a time in compatible combinations, including four AA or AAA cells, while the larger horizontal positions accommodate longer cylindrical cells.
From AAA and AA to 18650, 21700 and 26700 Cells
One of the strongest advantages of the ISDT C4 EVO is its unusually wide cylindrical battery size range. Supported sizes include:
AAA, AA, 10440, 10500, 12500, 13500, 14500, 14650, 16650, 17650, 17670, 18650, 18700, 20650, 20700, 21700, 22650, 26650 and 26700.
That makes the C4 EVO particularly useful as an 18650 battery charger, 21700 battery charger and smart AA/AAA charger without requiring separate chargers for every battery format. If you are working specifically with high-capacity 21700 cells, you can also browse our 21700 Li-ion cell collection.
Seven Battery Maintenance Modes in One Charger
The C4 EVO is designed not only for routine charging but also for ongoing battery maintenance and analysis. Available operating modes include:
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Charge – normal charging for compatible rechargeable cells.
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Discharge – controlled battery discharge.
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Storage – automatically charges or discharges supported lithium cells toward their preset storage voltage.
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Cycle – repeated charge/discharge cycling for battery maintenance.
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Analyse – evaluates battery performance and usable capacity.
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Activate – designed to help recover deeply discharged compatible NiMH/NiCd cells.
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Destroy – controlled end-of-life battery discharge mode.
Real-Time Battery Status and Internal Resistance Monitoring
The C4 EVO provides far more information than a simple battery-level indicator. During a task, the display can show battery chemistry, output voltage, current, charged or discharged capacity, operating time, voltage curve, internal resistance and temperature.
Individual channel status can be reviewed directly from the task preview interface, making it easier to compare cells and spot significant differences between batteries in the same set.
2.4-Inch IPS Display for Clear Battery Data
A full-color 320 × 240 IPS LCD provides a clear view of charging data and menu settings. The wide-view display makes voltage, current, capacity, time and task information easy to check at a glance whether the charger is sitting on a workbench or being used in a brighter environment.
USB-C QC and PD Input up to 36W
Power is supplied through the USB Type-C port with a 5–12V operating range and support for QC and PD protocols. Maximum input power is 36W, giving the C4 EVO a modern and convenient power interface without requiring a dedicated proprietary power supply.
The Type-C connection also serves as the firmware upgrade port, allowing the charger firmware to be updated through a computer when required.
Up to 3A Charging for Compatible Cylindrical Cells
Charging current depends on slot orientation. The horizontal channels support a selectable charging current from 0.1A to 3.0A, while the vertical channels support 0.1A to 1.5A. Discharge current is adjustable from 0.1A to 1.5A horizontally and 0.1A to 1.0A vertically.
Multiple Battery Protection Systems
The C4 EVO incorporates battery protection and monitoring functions designed to help reduce errors during charging and maintenance. Reverse-polarity protection is implemented differently depending on slot orientation, while overheating and over-capacity protection are also supported.
The charger continuously monitors operating conditions and displays warnings when a battery is inserted incorrectly or an abnormal condition is detected.
ISDT C4 EVO Specifications
| Model |
ISDT C4 EVO |
| SKU |
ISDTC4EVO |
| Channel Architecture |
6-channel smart charging architecture |
| Supported Battery Count |
1–4 cylindrical batteries depending on cell size and slot arrangement |
| Supported Battery Sizes |
AAA, AA, 10440, 10500, 12500, 13500, 14500, 14650, 16650, 17650, 17670, 18650, 18700, 20650, 20700, 21700, 22650, 26650, 26700 |
| Supported Chemistries |
NiMH, NiZn, Li-ion, LiFe, LiHV |
| Maximum Input Power |
36W |
| Operating Voltage Range |
5–12V, QC / PD supported |
| Charging Current |
0.1–3.0A horizontal / 0.1–1.5A vertical |
| Discharging Current |
0.1–1.5A horizontal / 0.1–1.0A vertical |
| Operating Modes |
Charge, Discharge, Storage, Destroy, Cycle, Activate, Analyse |
| Display |
2.4-inch 320 × 240 IPS LCD |
| Temperature Sensors |
6 internal sensors |
| Operating Temperature |
0–40°C |
| Reverse Polarity Protection |
Vertical physical protection / horizontal hardware protection |
| Overheating Protection |
Supported |
| Overcapacity Protection |
Supported |
| Dimensions |
120 × 92 × 34mm |
| Weight |
Approx. 195g |
Important Battery Compatibility Note
The C4 EVO is intended for supported individual cylindrical rechargeable cells. It should not be confused with a conventional RC balance charger designed for complete multi-cell LiPo battery packs.
For RC LiPo battery packs with balance leads, browse our dedicated LiPo battery charger collection.
Charging Safety
- Do not charge non-rechargeable batteries.
- Do not use batteries with damaged insulation.
- Keep the charger away from excessive heat and moisture.
- Keep ventilation openings clear during operation.
- Always confirm the correct battery chemistry and charging current before starting a task.
- NiZn and LiHV batteries should be selected manually when required.
ISDT C4 EVO Manual
For detailed operating instructions, battery setup and safety information, download the ISDT C4 EVO User Manual.
Frequently Asked Questions
Can the ISDT C4 EVO charge 18650 batteries?
Yes. The C4 EVO supports 18650 cylindrical rechargeable cells along with 18700, 20650, 20700, 21700, 22650, 26650 and 26700 sizes.
Can the C4 EVO charge 21700 batteries?
Yes. 21700 cells are included in the officially supported battery size range. Larger cells use the charger’s horizontal battery positions.
Can it charge AA and AAA batteries?
Yes. The charger supports AA and AAA rechargeable batteries and can handle up to four compatible AA or AAA cells simultaneously.
Does the C4 EVO support Li-ion and LiHV cells?
Yes. Supported chemistries include NiMH, NiZn, Li-ion, LiFe and LiHV. LiHV and NiZn battery types should be selected manually when necessary.
How many batteries can the C4 EVO charge at once?
The charger uses a six-channel architecture, but the official supported battery count is 1–4 cylindrical cells at a time depending on battery dimensions and slot orientation.
What is the maximum charging current?
Horizontal battery channels support up to 3.0A charging current, while vertical channels support up to 1.5A. Always follow the battery manufacturer's recommended charging current.
Does the ISDT C4 EVO support USB-C power?
Yes. The charger uses a USB Type-C input with a 5–12V operating range and support for QC and PD protocols, with maximum input power of 36W.
Can the C4 EVO analyse battery condition?
Yes. The Analyse mode can be used to examine battery performance and working capacity, while the charger can also display internal resistance, temperature, capacity and voltage data during operation.
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