1. Product Overview
The Dlyfull B3 is a versatile and high-precision battery checker designed to accurately measure the remaining capacity, voltage, and internal resistance of various battery types. It provides comprehensive information on battery health, making it an essential tool for managing your household batteries.

Figure 1: Dlyfull B3 Multi-functional Battery Tester. This image shows the front view of the battery tester, highlighting its LCD screen and rotary dial, along with the red and black test probes.

Figure 2: Dlyfull B3 Labeled Diagram. This diagram illustrates the key components of the Dlyfull B3, including (1) LCD display for test data, (2) percentage capacity indicator, (3) battery voltage, (4) tester's power battery, (5) battery resistance, (6) selection switch, and (7) location of two battery slots for power supply.
2. Features
2.1 Wide Battery Compatibility
The Dlyfull B3 supports a wide range of battery types, making it a versatile tool for various applications. It is compatible with over 11 types of batteries.

Figure 3: Battery Compatibility Chart. This chart details the various battery voltages and types supported by the Dlyfull B3, such as 1.2V Nickel-Hydrogen, 1.5V Alkaline, 3.0V Lithium Coin, 3.7V Lithium-Ion, and 9.0V Alkaline/Nickel-Hydrogen batteries.
2.2 LCD Display for Comprehensive Data
The intelligent LCD display provides clear and accurate readings of battery percentage, voltage, and internal resistance. It displays information precisely to two decimal places for accurate monitoring of battery status.

Figure 4: LCD Display in Action. The image shows the Dlyfull B3's large LCD screen actively displaying battery voltage, power percentage, and resistance parameters, providing a clear overview of the battery's condition.
2.3 High-Quality Test Probes
Equipped with flexible and excellent copper test pins, the Dlyfull B3 ensures more accurate parameter measurements during testing. Unlike ordinary sharp metal pins, these adjustable probes maintain stable contact, reducing measurement errors.

Figure 5: High-Quality Test Pins. This image compares the Dlyfull B3's adjustable copper test pins (left) with conventional sharp metal pins (right), highlighting the superior design for accurate and stable contact.
2.4 Self-Check Function
The device includes a self-check feature. By opening the back cover and inserting the included 1.5V AAA battery, the battery's remaining capacity is displayed in the upper right corner of the LCD screen, allowing for quick assessment of the internal battery's charge. This ensures simple, convenient, and durable operation.
3. Package Contents
- Dlyfull B3 Battery Checker x1
- 1.5V AAA Batteries x2 (pre-installed)
- Instruction Manual x1
4. Setup
Before first use, ensure the internal 1.5V AAA batteries are properly installed. These batteries power the tester's LCD display and internal circuitry.
- Locate the battery compartment on the back of the Dlyfull B3.
- Open the battery compartment cover.
- Verify that the two 1.5V AAA batteries are correctly inserted with the correct polarity (+/-).
- Close the battery compartment cover securely.
5. Operation
Follow these steps to accurately test your batteries:
- Select Battery Type: Rotate the central dial on the Dlyfull B3 to match the voltage and type of the battery you intend to test. Ensure the selected setting corresponds accurately to your battery (e.g., 1.5V ALK for alkaline batteries, 3.7V Li-ion for lithium-ion batteries).
- Connect Test Probes:
- Connect the red test probe to the positive (+) terminal of the battery.
- Connect the black test probe to the negative (-) terminal of the battery.
- Read Measurements: Hold the probes in place for approximately 2 seconds. The LCD screen will display the following information:
- Voltage (V): The current voltage of the battery.
- Internal Resistance (Ω): The internal resistance value of the battery.
- Remaining Capacity (%): An estimated percentage of the battery's remaining charge.
- Interpret Results: Use the displayed information to assess the battery's health. A low voltage, high internal resistance, or low remaining capacity may indicate that the battery needs to be recharged or replaced.

Figure 6: Operating the Dlyfull B3. This image illustrates the two main steps of operation: selecting the battery type using the rotary dial and connecting the test probes to a battery for measurement.
6. Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the Dlyfull B3 in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Replacement: If the internal 1.5V AAA batteries that power the tester's display are low, replace them promptly to ensure accurate readings and proper device function.
- Probe Care: Keep the test probes clean and free of debris to ensure good electrical contact. If terminals are dirty, clean them before testing.
7. Troubleshooting
- No Display/Faint Display:
- Check if the internal 1.5V AAA batteries are installed correctly and have sufficient charge. Replace if necessary.
- Inaccurate Readings:
- Ensure the rotary dial is set to the correct battery type and voltage.
- Verify that the test probes have firm and clean contact with the battery terminals. Clean terminals if dirty.
- Test the device with a known good battery to confirm functionality.
- Device Not Responding:
- Remove and reinsert the internal AAA batteries.
- If the issue persists, contact customer support.
8. Specifications

Figure 7: Compact Design and Dimensions. This image provides a visual representation of the Dlyfull B3's compact size and includes its approximate dimensions, emphasizing its portability.
| Specification | Detail |
|---|---|
| Brand | DLYFULL |
| Model Number | B3 |
| Item Weight | 220 g |
| Package Dimensions | 17 x 10.6 x 3.6 cm |
| Color | Black |
| Style | Rechargeable |
| Power Source | Battery Powered |
| Supported Voltages | 1.2V, 1.45V, 1.5V, 3V, 3.2V, 3.7V, 6V, 9V, 12V |
| Batteries Included | Yes (2x AAA for internal power) |
| Battery Type (Internal) | Alkaline |
9. Warranty and Support
The Dlyfull B3 Battery Tester comes with an 18-month warranty from the date of purchase. For any product-related inquiries, technical assistance, or warranty claims, please contact Dlyfull customer service.
- Customer Service: 24-hour customer service is available to assist you.
- Contact Information: Please refer to the contact details provided in the product packaging or on the official Dlyfull website for the most up-to-date support channels.
Please retain your purchase receipt as proof of purchase for warranty purposes.
