Universal Smart Battery Charger FC A4 with Smart LCD Display for Rechargeable 9V 18650 AA AAA C D 26650 Batteries Li-ion Ni-MH - 6 Bay (2x 9V Battery Bays and 4x Universal Bays)

Experience efficient and convenient charging with our 9V AA AAA Battery Charger FC A4! This 2-in-1 multifunctional charger features 6 battery bays, including 2 designated for 9V batteries and 4 universal slots for various battery types (Ni-MH, Ni-Cd, Li-ion, LiFePO4) such as AA, AAA, C, D, 26650 and more (refer to picture or product description for compatible models). The Intelligent Large LCD Display Screen provides a complete view of each battery's charging statistics, including voltage, current, capacity, percentage, and time. In addition, the charger automatically detects different battery models and selects the appropriate charging voltage and current, while also offering manual settings for customized charging. Trust in our expertly designed charger for all your battery needs.

Test, refresh, discharge function (MODE BUTTON only for slot 4)

• Test - Test real battery capacity, battery internal resistance
• Refresh- Refresh the battery into best condition
• Discharge- Remove battery memory effect

Test Mode Notes: 

During Test mode, it will display "real capacity" of the battery in Slot 4 after "Charge-Discharge" process

For Test Mode, the battery will be discharged and stopped. 
If you need to use the battery on Slot 4, you need to charge it manually

Battery Type Compatibility:
AA, AAA, C, D, 9V, 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14350, 14430, 14500, 14650, 16500, 16340 (RCR123A), 16650, 17350, 17500,  17650, 17670, 18350, 18490, 26500, 26650, 32650

Battery Chemistry Compatibility:
9V, Ni-MH Ni-Cd (1.2V), Li-ion (3.6V/3.7V/4.2V/4.35V), LiFePO4 (3.2V) (6F22)

Charger Battery Application

• Flashlight
• Clock
• Smoke detector
• Toy car
• Thermometer
• Multimeter
• Digital Camera
• Security cameras
• Remote controller
• Electric shaver
• Microphone 

Multiple Protect Function for Safety

• Battery Reverse Protection
  
• Short Circuit Protection
  
• Over-heart Protection
  
• Over-charge Protection
  
• Short Circuit Protection
  
• TC-Wake Up
  
• CC-fast charge
  
• CV-fully charge

Two kinds of input AC/DC 12V  - Allow you to use at home or in the car

Fast charger at 2A Speedy Charge, 4.5A total output
Charging current from 200mA to 2000mA is manually selectable 

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Mode Button Settings

Charge: Charger will bring the battery to 100% fully charged 

Discharge:
Charger will discharge the battery until it reaches a safe cutoff point
No risk of discharging too low and damaging the battery (dead battery)
Function is for  Ni-Cd, Li-ion, and LiFePO4 batteries

Refresh: 
Display of Results: Upon completion of the testing mode, the following information is displayed:

• Discharge capacity
  
• Discharge duration
  
• Battery voltage
  
• Charging current
  
• Battery internal resistance
• Battery level: 100%
• Completion indicator: END

The refresh function continuously performs multiple charge-discharge cycles, comparing the actual capacity from each cycle until no further capacity increase is observed.
Once capacity stabilizes, the function will stop charging and display the maximum repairable capacity achievable by the battery. In summary, the test mode only executes one complete cycle, whereas the refresh mode may automatically repeat multiple test processes

Test: 
The test mode consists of three stages: charging, discharging, and recharging.
Upon completion of the test mode, information such as discharge capacity, discharge time, battery voltage, charging current, battery internal resistance, battery level (100%), and "END" will be displayed.

9V AA AAA Battery Charger - 2-in-1 multifunction charger equipped with 6 battery bays, with 2 bays designed only for 9V battery. The 4 bays are universal slots for Ni-MH, Ni-Cd, Li-ion, LiFePO4 batteries such as AA, AAA, C, D, 26650 and more (Please check picture or product description to confirm other compatible battery models)

Intelligent Large LCD Display Screen - Full display lets you clearly see each battery’s charging stats such as: battery type, voltage, current, present capacity, power percentage, charging time and so on. The charger can identify different battery models and automatically choose right charging voltage and current automatically. Manual setting is also available so you can set it according to your charging needs

Test Function - Aside for charging batteries, the fourth (4th) bay can also exclusively be used to discharge/refresh/test batteries (not applicable for other bays). With this function, you can know the battery power situation or detect batteries that may have defects or are in need of repair

100% Safe - The universal battery charger was upgraded to the latest microcomputer control technology with approved CE FCC certification. Functions include battery charge and discharge, battery test and refresh, auto select charging current and auto measure battery capacity; prevents overcharging, overcurrent; has reverse polarity, short circuit, and overheat protection

PRODUCT SAFETY:

Do not attempt to charge damaged, expired, leaking, corroded or rusted batteries. Always inspect batteries before using

Don't use extension cords to connect the unit to avoid short-circuiting

Use the unit only at ambient temperatures (0-40 degree C)

Always draw the main plug out of the socket after each use and before cleaning around sockets

Never tinker with the unit by yourself, otherwise warranty will be voided

Do not use damaged or corroded accumulators

This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capacities, or by persons lacking in experience or knowledge, unless they are supervised or instructed on the use of this unit by a person responsible for their safety. Children should be supervised to ensure they do not play with this unit.

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FAQs:

Q: Can the charger be ON always or do I need to unplug it?
A: The A4 charger is equipped with multiple safety protections, including overcharge protection, short-circuit protection and over-temperature protection. From a functional standpoint, it is designed to be safe for continuous connection to a power source.
However, for optimal safety, energy efficiency, and long-term reliability, we recommend unplugging the charger when it is not in use for extended periods. While the protection circuits are robust, disconnecting the charger entirely eliminates any minimal standby power consumption and reduces long-term stress on internal components, thereby maximizing the product's lifespan.

Q: There was a review that had concerns about 9v batteries. The reviewer stated that the 9v battery reached a high level of charge (11 Volts). Is this safe or is there a setting that needs to be made?
A: This observed behavior is normal and safe.
- The A4 charger supports Ni-MH 9V batteries ( 6F22 ). A standard 9V Ni-MH battery consists of seven or eight individual cells connected in series.
- Each Ni-MH cell, when fully charged, reaches a voltage of approximately 1.4V-1.5V. Therefore, the total voltage for a fully charged 9V Ni-MH battery neutrally reaches a range between 9.8V and 11.6V.
- The charger does not simply apply a fixed voltage. It uses a precise pulse charging algorithm with a -ΔV cut-off detection for Ni-MH batteries. This intelligent system detects the slight voltage drop that occurs when the battery is fully charged and automatically terminates the charging process.

Thus, seeing a voltage of ~11V indicates that the battery is nearing a fully charge sate, and the charger's internal logic is correctly managing the process. No manual settings are required for this function; the charger handles it automatically.

Q: What is the best way to charge AA, AAA, C and D batteries? Please tell me the settings I need to make to take the best care of the batteries.
A: To ensure optimal performance and maximize the lifespan of your AA, AAA, C, and D (Ni-MH) batteries, please follow these steps:
a) Slot Selection:
• C and D Size Batteries: Must be placed only in CH1 or CH4, as these are the only slots designed to physically and electrically accommodate larger cells.
• AA and AAA Batteries: Can be placed in any of the four slots (CH1-CH4).
b) Battery Type Setting (Crucial Step):
• After inserting the battery, you must set the correct battery type for that slot.
• Long-press the MODE button (right button) until the battery type display changes to "Ni-MH" (or "Ni-Cd" if applicable). This ensures the charger uses the correct charging algorithm (pulse charge with -ΔV cut-off) instead of the lithium-ion algorithm.
c) Current Selection (Key for Battery Health):
Choosing the appropriate charging current is vital for battery longevity. We recommend the following:
• For AAA Batteries (typically lower capacity, e.g., <1000mAh): Use a lower current to reduce heat and stress. We recommend selecting 0.2A or 0.5A using the CURRENT button (left button).
• For AA Batteries (capacity ~1500-2800mAh): A moderate current offers a good balance between speed and care. We recommend 0.5A. For high-capacity models (≥2500mAh), you may use 0.8A or 1A.
• For C and D Batteries (high capacity): You can safely use the 1A setting to achieve reasonable charging times.

Summary of Best Practices:
1. Correct Slot: C/D in CH1/CH4 only.
2. Correct Chemistry: Long-press MODE to select Ni-MH.
3. Gentle Current: Use 0.2A-0.5A for AAA, 0.5A-1A for AA, and 1A for C/D.

Type: FC A4 Charger
Input: AC 100-240V 50/60Hz; DC 12V/3A
Output 1: DC 1.48V 0.2A/0.5A/0.8A/1.0A x4
Output 2: DC 3.65V 0.2A/0.5A/0.8A/1.0A x 4; 1.5A x 3; 2A x 2
Output 3: DC 4.2V/4.35V/0.5A/0.8A/1.0A x 4; 1.5A x 3; 2A x 2
Output 4: DC 9V 60mA/120mA x 2
Power Source: Compatible with DC12 3A and AC100-250
Dimensions: 6.57 x 4.84 x 1.8 in
Weight: 12.8 oz
Package Includes: 1x Charger, 1x Power Cable
MPN: FC A4
SKU: 2172

30-Day No Questions Asked Returns with USA-based Brand Warranty and Customer Service available. Please contact us if you have any questions or concerns!