1. Ifihan
The Mastfuyi FY8912B is a professional 12V/24V automotive battery tester designed for comprehensive diagnosis of various lead-acid batteries. It provides accurate measurements of battery voltage, state of charge (SOC), cold cranking amps (CCA), internal resistance (I-R), and state of health (SOH), offering clear recommendations for battery maintenance or replacement. This device also features tests for the starter and charging systems of vehicles.
This manual provides detailed instructions for the safe and effective use of your FY8912B Battery Tester. Please read it thoroughly before operation.
2. Alaye Aabo
⚠ ÌKÌLỌ̀: Ọjà yìí lè fi ọ́ hàn sí àwọn kẹ́míkà títí bí òdòdó, èyí tí Ìpínlẹ̀ California mọ̀ pé ó lè fa àrùn jẹjẹrẹ àti àbùkù ìbímọ tàbí àwọn ìpalára mìíràn fún ìbímọ. Fún ìwífún síi, lọ sí www.P65Warnings.ca.gov.
Always wear appropriate personal protective equipment, such as safety glasses and gloves, when working with automotive batteries.
Ensure proper ventilation when testing batteries to avoid accumulation of explosive gases.
Avoid short-circuiting battery terminals. Connect the tester clamps correctly: red to positive (+), black to negative (-).
3. Package Awọn akoonu
Daju pe gbogbo awọn nkan wa ninu apo rẹ:
- Host Unit (FY8912B Battery Tester)
- Adapter Clamps (Red and Black test leads)
- Afowoyi Olumulo (iwe-ipamọ yii)
- Cloth Pouch
- Socket Nut (if applicable)

4. Ọja Ipariview
The FY8912B is a compact and user-friendly battery tester. It features a clear display and intuitive button controls for easy navigation and testing.

4.1 Awọn paati bọtini
- Iboju ifihan: Shows test results, menu options, and other information.
- Bọtini O dara: Jẹrisi awọn aṣayan tabi tẹ awọn akojọ aṣayan sii.
- ESC Button (RST): Goes back to the previous menu or resets the device.
- Àwọn Kọ́kọ́rọ́ Àmì Ìtọ́ka Òkè/Sàn: Ó ń lọ kiri nípasẹ̀ àwọn àṣàyàn àkójọ tàbí ó ń ṣàtúnṣe àwọn iye.
- Test Clips: Red clip for positive (+) battery terminal, Black clip for negative (-) battery terminal.
5. Eto ati Asopọ
The FY8912B does not require internal batteries; it is powered directly by the battery under test.

5.1 Connecting the Tester
- Rii daju pe ina ọkọ ti wa ni pipa ati pe gbogbo awọn ẹya ẹrọ ti wa ni pipa.
- Clean the battery terminals to ensure good contact.
- Connect the RED test clip to the positive (+) battery terminal.
- Connect the BLACK test clip to the negative (-) battery terminal.
- Ensure the inner teeth of the clamps make full contact with the battery terminals for accurate measurement.

Once connected, the tester will power on automatically.
6. Awọn ilana Iṣiṣẹ
The FY8912B automatically identifies the battery voltage (12V tabi 24V) lori asopọ.
6.1 Akojọ aṣyn akọkọ Lilọ kiri
Use the Up/Down arrow keys to navigate through the main menu options and the OK button to select.
- Idanwo Batiri: Performs a diagnostic test on the battery.
- Idanwo Ibẹrẹ: Evaluates the vehicle's starter system.
- Ikojọpọ ti o pọju: Conducts a maximum load test on the battery.
- Charging SYS: Tests the vehicle's charging system.
- Eto ede: Changes the display language (English/Chinese).
6.2 Testing Principle (Kelvin Test)
The FY8912B utilizes the Kelvin test method, which applies a fixed frequency and small fixed current test signal to the battery. It then samples the voltage and calculates the internal resistance through an algorithm. This method offers several advantages over traditional load tests:
- It can measure almost all battery types, including small-capacity batteries, which might not withstand the high currents of load tests.
- This measurement method does not cause significant damage to the battery's internal electrodes, unlike high-current load tests that can induce electrode polarization and potential damage.
While internal resistance is complex and cannot solely predict battery life, a sudden increase in internal resistance or a decrease in CCA can indicate the battery is nearing its end of life.
6.3 batiri igbeyewo
This test assesses the overall health of the battery.
- From the Main Menu, select "1. Battery Test" and press OK.
- Select the battery type (e.g., Regular Batt, AGM Tablet, AGM Winding, GEL, EFB) and press OK.
- Choose the test mode:
- Idanwo iyara: For a rapid assessment. Select the battery capacity (e.g., 12AH) and press OK.
- Precise Test: For a more detailed analysis. Select the battery form (e.g., CCA, IEC, EN, DIN, SAE, JIS) and then input the battery specification (e.g., 160 CCA) using the Up/Down keys and press OK.
- The tester will display "Testing and analyzing... please wait!".
- Once complete, the results will show Voltage, SOC, CCA, SOH, and Internal Resistance, along with a status (Good, Poor, Replace, etc.).


6.4 Starter System Load Test (Car)
This test evaluates the performance of the vehicle's starter motor.
- From the Main Menu, select "2. Starter Test" and press OK.
- With the car engine turned off, start the vehicle engine as prompted by the tester.
- The tester will analyze the starting voltage and provide a result.
| Ngba agbara Voltage | Batiri Sisọ Performance | Battery Action |
|---|---|---|
| Ju 10.7V | O dara | Ko si ye lati ropo |
| 10.2V ~ 10.7V | Deede | A nilo akiyesi |
| 9.6V ~ 10.2V | Talaka | Rọpo |
| Ni isalẹ 9.6V | Talaka pupọ | Replace Immediately |
For specific operations, please refer to the user manual.
6.5 Running Maximum Load Test (Car)
This test evaluates the battery's ability to handle maximum load.
- From the Main Menu, select "3. Maximum Load" and press OK.
- With the car engine turned off, apply full load in P gear and increase RPM to 2000-2500 as prompted.
- The tester will analyze the battery performance under maximum load.
| Conditions & A/C off | Batiri Voltage | Generator Performance |
|---|---|---|
| (Test with Accelerator Depressed) | Ju 13.5V | Deede |
| 13.2V - 13.5V | deede | |
| Ni isalẹ 13.0V | A nilo akiyesi | |
| Headlights & A/C on | Ju 14.0V | Deede |
| (Test with Accelerator Depressed) | 13.2V - 14.0V | A nilo akiyesi |
| Ni isalẹ 13.2V | Check Immediately |
For specific operations, please refer to the user manual.
6.6 Charging System Test (Car)
This test evaluates the vehicle's alternator and charging system.
- From the Main Menu, select "4. Charging SYS" and press OK.
- With the car engine turned off, start the engine, keep the transmission in P gear, and increase RPM to 2000-2500 RPM as prompted.
- Olùdánwò náà yóò ṣe àyẹ̀wò vol gbigba agbaratage and provide a result.
| Conditions & A/C off | Batiri Voltage | Generator Performance |
|---|---|---|
| (Test with Accelerator Depressed) | Ju 13.5V | Deede |
| 13.2V - 13.5V | deede | |
| Ni isalẹ 13.0V | A nilo akiyesi | |
| Headlights & A/C on | Ju 14.0V | Deede |
| (Test with Accelerator Depressed) | 13.2V - 14.0V | A nilo akiyesi |
| Ni isalẹ 13.2V | Check Immediately |
For specific operations, please refer to the user manual.

6.7 Eto ede
Lati yi ede ifihan pada:
- From the Main Menu, select "5. Language Set" and press OK.
- Use the Up/Down arrow keys to select your desired language (English or Chinese) and press OK.
7. Awọn pato
The Mastfuyi FY8912B Battery Tester is designed with the following technical specifications:
| Iwa | Iye |
|---|---|
| Nọmba awoṣe | FY8912B |
| Iru | Vehicle Battery Tester |
| DIY Agbari | Itanna |
| Orukọ Brand | Mastfuyi |
| Ipilẹṣẹ | Orile-ede China |
| Ijẹrisi | CE, FCC, RoHS |
| Batiri To wa | No (Powered by tested battery) |
| Agbara Range | 3AH ~ 250AH |
| Iwọn ti CCA | 100~1700 |
| Battery Life Detection | BẸẸNI |
| Battery Resistance Detection | BẸẸNI |
| Discharge Current Test | BẸẸNI |
| Voltage Iwari | BẸẸNI |
| Idaabobo Yiyipada Polarity | BẸẸNI |
| Awari Ipele Batiri | BẸẸNI |
| Start Load Test | BẸẸNI |
| Run Maximum Load Test | BẸẸNI |
| Charging System Load Test | BẸẸNI |
| Iwọn ọja | 16.2 x 8.4 x 3.5 cm |
| Iwọn Ọja | 286g |
| Gígùn Ìdánwò Ìdarí | ~59cm (with clamps) |
| Akọsilẹ wiwọn | Battery under test must be fully charged before measurement |
| Ohun elo Dopin | Various cars, motorcycles, lawn mower, forklifts, etc. |



8. Itọju
- Jeki ẹrọ naa mọ ki o gbẹ. Lo asọ, damp Aṣọ láti nu ìta rẹ̀. Má ṣe lo àwọn ohun ìfọṣọ tàbí àwọn ohun èlò ìfọṣọ.
- Store the tester in its cloth pouch when not in use to protect it from dust and damage.
- Yago fun ṣiṣafihan ẹrọ naa si awọn iwọn otutu to gaju, ọriniinitutu, tabi oorun taara.
- Ṣe àyẹ̀wò àwọn ìtọ́sọ́nà ìdánwò àti cl déédééamps for any signs of wear or damage. Replace if necessary.
9. Laasigbotitusita
9.1 Wọpọ Oran ati Solusan
- Olùdánwò kò ṣiṣẹ́:
- Ensure the test clips are securely connected to the battery terminals.
- Ṣayẹwo boya batiri naa pọtage is within the operating range (8V-36V).
- Verify that the battery terminals are clean and free of corrosion.
- Awọn kika ti ko pe:
- Ensure the test clips have full contact with the battery terminals (refer to Figure 5.2).
- Make sure the battery is fully charged before performing a measurement for optimal accuracy.
- Confirm that the correct battery type and specification (CCA/Capacity) are selected in the tester's menu.
- "Replace Recommended" message:
- This indicates the battery's State of Health (SOH) is below 45% or other parameters are critically low. Consider replacing the battery.
- Ensure the battery was fully charged before testing.
10. Awọn imọran olumulo
- For the most accurate battery test results, always ensure the battery is fully charged before connecting the tester.
- When performing the Starter Test or Charging System Test, follow the on-screen prompts carefully regarding engine status and RPM.
- The Kelvin test method used by this device is non-damaging to the battery, making it safe for frequent use.
- This tester is a valuable tool for preventing unexpected vehicle breakdowns due to battery failure. Regular checks can save time and money.
- The CCA value measured for a new battery might be about 10% higher than the marked value, and it gradually decreases during use.
11. Atilẹyin ọja ati Support
Fún àlàyé nípa àtìlẹ́yìn tàbí ìrànlọ́wọ́ ìmọ̀ ẹ̀rọ, jọ̀wọ́ wo ìlànà olùtajà tàbí kí o kàn sí olùpèsè náà tààrà. Pa ìwé ẹ̀rí ìrajà rẹ mọ́ gẹ́gẹ́ bí ẹ̀rí ìrajà náà.





