1. Product Overview
This manual provides essential information for the safe and effective use of your HE394 Li-ion mobile phone battery. This battery is designed as a replacement for the Sharp AQUOS Zero 5G Basic SH-51A.

Image: HE394 Li-ion battery with key specifications and included repair tools.

Image: Compatibility details for the HE394 battery.
2. Setup and Installation
Before installation, ensure you have the correct battery model (HE394) for your device (Sharp AQUOS Zero 5G Basic SH-51A). Installation of a mobile phone battery typically requires technical skill and specialized tools. If you are not confident in performing the replacement yourself, it is recommended to seek professional assistance.
2.1 Included Repair Tools
A set of basic repair tools is often included to assist with the battery replacement process.

Image: Example of a free repair tool kit provided.
2.2 Initial Battery Activation
Upon receiving a new rechargeable battery, it may be in a self-protection state due to transportation. To activate and maximize its capacity, perform 5-10 full charge-discharge cycles. This means fully charging the battery, then using the device until the battery is nearly depleted, and repeating this process several times.
3. Operating Guidelines
3.1 Charging
- Use only high-quality chargers or the original charger provided with your device. Inferior chargers can damage the battery.
- Avoid using your phone while it is charging, as this can shorten the battery's lifespan and pose safety risks.
- Do not leave the battery in the charger for excessively long periods after it has reached full charge.
- If the battery cannot be charged initially, ensure you are using a high-power charger for at least 10 hours to activate it from its self-protection state.
4. Maintenance and Safety
4.1 Battery Care Tips
- To prevent battery swelling (known as 'drum packs'), avoid over-discharging or leaving the battery idle for extended periods.
- Keep the battery charge above 20%. Prolonged low charge states can shorten battery life.
- Avoid exposing the battery to low temperatures, as this can also contribute to battery swelling.
4.2 Safety Precautions
- Do not disassemble, puncture, crush, heat, or burn the battery.
- Do not tear off the battery label.
- The battery features short circuit protection with 4 memory metal fuses, designed for self-repair when at normal temperature, preventing short circuits, fire, or explosions.

Image: Diagram of the battery's short circuit protection mechanism.
4.3 Performance Improvement
This battery utilizes Double Li-ion technology, which offers higher conversion efficiency, faster charging speed, and longer usage time compared to single Li-ion batteries.

Image: Performance comparison highlighting benefits of Double Li-ion technology.
5. Troubleshooting
5.1 Battery Drains Quickly
If your battery seems to drain quickly, ensure you have completed the initial 5-10 charge-discharge cycles to allow the battery to reach its maximum capacity. If the problem persists after these cycles, please contact customer support for assistance.
5.2 Battery Not Charging
If the battery is not charging, first ensure you are using a compatible and functional charger. For new batteries, a prolonged charge (e.g., 10 hours with a high-power charger) might be necessary to activate it from its transportation self-protection mode. If the issue continues, contact customer support.
6. Specifications
| Feature | Detail |
|---|---|
| Battery Model | HE394 |
| Compatible Device | Sharp AQUOS Zero 5G Basic SH-51A |
| Battery Type | Li-ion |
| Rated Capacity | 4000mAh / 15.40Wh |
| Typical Capacity | 4050mAh / 15.59Wh |
| Nominal Voltage | 3.87VDC |
| Quality Certification | MSDS |
| Origin | Mainland China |
| Quality | Grade A & Tested well before shipping |
| Package Weight | 0.11 kg |
| Package Dimensions | 10cm x 10cm x 10cm |

Image: Overview of product certifications.
7. User Tips
- For optimal battery performance, ensure you complete 5-10 full charge-discharge cycles upon initial use.
- Always prioritize using a high-power charger or the original charger to prevent battery damage and ensure efficient charging.
- Avoid using your phone while it is charging to help preserve the battery's overall lifespan and maintain safety.
- Regularly check the battery model to ensure it matches your device before attempting any replacement.
8. Frequently Asked Questions (FAQ)
- Q: Why does my battery drain quickly?
- A: New batteries require 5-10 charge-discharge cycles to reach maximum capacity. If the issue persists after these cycles, please contact support.
- Q: The battery cannot be charged?
- A: During transportation, the battery's self-protection may be activated. Use a high-power charger for about 10 hours to activate it. If the problem continues, contact us.
- Q: What should I check before ordering?
- A: Always ensure the battery model (HE394) is identical to your device's original battery. Consult us if you have any doubts about compatibility.
9. Warranty and Support
For any issues, questions, or support needs regarding your HE394 battery, please contact the seller directly. They can provide assistance with troubleshooting and potential warranty claims.
An additional user manual in PDF format is available for detailed instructions: View User Manual (PDF)