1. Introduction
This manual provides essential information for the safe and efficient use of your Energizer E288S 4G KaiOS phone. Please read it carefully before using the device and keep it for future reference.
The Energizer E288S combines the functionality of a smartphone with the simplicity of a classic keypad phone. It features 4G connectivity, a 2.8-inch screen, dual SIM support, and runs on the KaiOS operating system, providing access to various applications.
2. Safety Information
- Do not expose the phone to extreme temperatures, direct sunlight, or high humidity.
- Use only Energizer-approved batteries, chargers, and accessories.
- Avoid dropping or subjecting the phone to severe impact.
- Keep the phone away from medical devices, as it may interfere with their operation.
- Do not attempt to disassemble or repair the phone yourself. Refer to qualified service personnel.
- Dispose of the phone and battery responsibly according to local regulations.
3. Package Contents
Ensure all items are present in the box:
- Energizer E288S Phone
- USB-C Cable (1m)
- Battery (2000 mAh)
- Quick Start Guide
- Note: A wall charger is not included.

Front view of the Energizer E288S phone, showing the screen and keypad.
4. Phone Layout
Familiarize yourself with the physical components of your E288S phone.

Front View: Screen, Alphanumeric Keypad, Navigation Keys, Call/End Buttons.

Rear View: Rear Camera, LED Flash, Speaker, Textured Casing.

Side View: USB-C Port (bottom), Volume Buttons (side).
5. Setup
5.1. Installing SIM Card(s) and Battery
- Remove the Back Cover: Gently pry open the back cover from the notch located at the bottom or side of the phone.
- Insert SIM Card(s): Locate the SIM card slots. The E288S supports two SIM cards. Insert your Nano-SIM cards into the designated slots with the gold contacts facing down.
- Insert Memory Card (Optional): If you wish to expand storage, insert a microSD card into the dedicated slot.
- Insert Battery: Place the 2000 mAh battery into the battery compartment, ensuring the contacts align with those on the phone.
- Replace Back Cover: Align the back cover and press firmly until it clicks into place.
5.2. Charging the Battery
Before first use, fully charge the phone battery.
- Connect the USB-C cable to the phone's charging port.
- Connect the other end of the USB-C cable to a compatible USB wall adapter (not included) or a computer's USB port.
- The charging indicator will appear on the screen.
- Once fully charged, disconnect the cable.

The 2000 mAh battery provides extended usage, up to 17 days standby or 10 hours talk time.
5.3. Powering On/Off
- To Power On: Press and hold the Power/End Call button until the screen lights up.
- To Power Off: Press and hold the Power/End Call button, then select "Power Off" from the options.
6. Operating Your Phone
6.1. Basic Functions
- Making Calls: Enter the number using the keypad and press the Call button.
- Answering Calls: Press the Call button when the phone rings.
- Sending Messages: Navigate to the Messaging app, compose your message, and send.
6.2. KaiOS Features
Your E288S runs on KaiOS, offering a range of smart features:
- Internet Access (4G & Wi-Fi): Connect to the internet using 4G mobile data or Wi-Fi networks. Navigate to Settings > Network & Connectivity to manage these options.
- GPS: Utilize location services with compatible applications like Google Maps.
- KaiStore: Access and download various applications such as Facebook, Twitter, YouTube, and more.

Experience fast internet with 4G LTE connectivity on your E288S.

KaiOS provides access to essential smartphone applications for communication and entertainment.
6.3. Camera Usage
The E288S features both front and rear cameras with an integrated flash.
- Open the Camera application from the main menu.
- Use the navigation keys to switch between front and rear cameras, and to activate/deactivate the flash.
- Press the center navigation key to capture photos or record videos.
6.4. Dual SIM Functionality
The dual SIM feature allows you to use two different phone numbers or network providers simultaneously. You can manage your preferred SIM for calls, messages, and data in the phone's settings.
7. Maintenance
7.1. Battery Care
- Avoid fully discharging the battery frequently.
- Do not leave the phone connected to the charger for extended periods after it's fully charged.
- Store the phone in a cool, dry place when not in use for long periods.
7.2. Cleaning
- Use a soft, dry cloth to clean the phone's screen and body.
- Avoid using liquid cleaners or abrasive materials.
7.3. Software Updates
Periodically check for software updates to ensure optimal performance and security. Navigate to Settings > Device > Software Update to check for and install available updates.
8. Troubleshooting
| Problem | Solution |
|---|---|
| Phone does not power on. | Ensure the battery is correctly inserted and fully charged. Try connecting the charger. |
| Cannot make or receive calls. | Check if SIM cards are properly inserted. Verify network signal strength. Ensure airplane mode is off. |
| Internet connection issues. | Check 4G data settings or Wi-Fi connection. Ensure data plan is active. Restart the phone. |
| Phone is slow or unresponsive. | Close unused applications. Clear cache. Restart the phone. If issues persist, consider a factory reset (backup data first). |
| Battery drains quickly. | Reduce screen brightness. Close background apps. Disable Wi-Fi/Bluetooth/GPS when not in use. |
9. Specifications
- Brand: Energizer
- Model: E288S
- Operating System: KaiOS (based on Mediatek MT6739WW)
- CPU: MediaTek_MT8127, 1.3 GHz
- RAM: 512 MB
- Internal Storage: 4 GB
- Expandable Storage: Yes (microSD)
- Screen Size: 2.8 Inches
- Resolution: 854 x 480
- Connectivity: 4G, Wi-Fi, Bluetooth, GPS
- SIM Support: Dual SIM (Nano-SIM)
- Battery: 2000 mAh Lithium-ion
- Cameras: Front and Rear Cameras with Flash
- Charging Port: USB Type-C
- Color: Black
- Country of Origin: China

The E288S casing is made from recycled plastic, reflecting an eco-friendly design.
10. Warranty and Support
10.1. Manufacturer Warranty
The Energizer E288S comes with a manufacturer warranty. Please refer to the warranty card included in your package for specific terms, conditions, and duration. The product specifications indicate a 16-year manufacturer warranty; however, specific regional terms may vary. Keep your proof of purchase for warranty claims.
10.2. Customer Support
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact Energizer customer support or visit the official Energizer mobile website. Contact details are typically provided in the quick start guide or on the product packaging.





