1. Introduction
This manual provides essential information for the safe and effective use of your Otech 750 mAh NiMH battery, designed for compatibility with the VTECH BM2100 Unite Parents babyphone. Please read this manual thoroughly before installation and use to ensure optimal performance and longevity of your battery.
2. Safety Information
- Do not disassemble, crush, puncture, or short-circuit the battery.
- Do not expose the battery to high temperatures (above 60°C / 140°F) or direct sunlight.
- Keep the battery away from water, fire, and corrosive substances.
- Do not use the battery if it shows signs of damage, swelling, or leakage.
- Dispose of used batteries according to local regulations. Do not dispose of with household waste.
- Keep out of reach of children.
3. Setup
3.1 Unpacking
Carefully remove the battery from its packaging. Inspect the battery for any visible damage. If damage is present, do not proceed with installation and contact support.
3.2 Installation
Before installing the new battery, ensure your VTECH BM2100 Unite Parents babyphone is turned off and disconnected from any power source. Refer to your babyphone's original instruction manual for specific battery compartment location and opening instructions.
- Locate the battery compartment on your VTECH BM2100 babyphone unit.
- Open the battery compartment cover.
- If replacing an old battery, carefully remove it.
- Align the connector of the new Otech battery with the corresponding port inside the compartment. Ensure the polarity is correct.
- Gently push the connector until it clicks into place, ensuring a secure connection.
- Place the battery neatly inside the compartment.
- Close the battery compartment cover securely.

Image 1: Front view of the Otech Ni-MH battery, showing the green casing, specifications, and the attached white connector with red and black wires.

Image 2: Side view of the Otech Ni-MH battery, highlighting its cylindrical shape and the attached connector.
4. Operating Instructions
4.1 Initial Charge
After installing the new battery, it is recommended to fully charge it before first use. Connect your VTECH BM2100 babyphone to its power adapter and allow it to charge for at least 12-16 hours, even if the charge indicator shows full. This initial charge helps to condition the battery for optimal performance and longevity.
4.2 Normal Use
For daily use, connect the babyphone to its power adapter when not in use or when the battery level is low. The battery is designed for regular charging and discharging cycles. Avoid completely draining the battery frequently, as this can reduce its overall lifespan.
5. Maintenance
- Temperature: Store and operate the battery within recommended temperature ranges (typically 0°C to 45°C or 32°F to 113°F). Extreme temperatures can degrade battery performance and lifespan.
- Cleaning: Keep the battery contacts clean and free from dust or debris. Use a dry, soft cloth to wipe the battery if necessary.
- Storage: If the battery will not be used for an extended period, store it in a cool, dry place at approximately 50% charge. Recharge it every 3-6 months to prevent deep discharge.
- Disposal: When the battery reaches the end of its life, dispose of it responsibly at a designated battery recycling facility.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Battery not charging | Incorrect installation; Faulty charger/adapter; Battery issue | Ensure battery is correctly installed and connected. Test with another charger/adapter if possible. If issue persists, battery may need replacement. |
| Short operating time | Battery not fully charged; Battery nearing end of life | Ensure full initial charge (12-16 hours). If battery is old, consider replacement. |
| Babyphone not powering on | Battery not installed; Battery completely discharged; Battery faulty | Verify battery installation. Connect babyphone to power adapter to see if it powers on. If not, battery may be faulty. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | Otech |
| Model Number | 2K75SLI-13109910 |
| Compatible Devices | VTECH BM2100 Unite Parents babyphone |
| Battery Type | NiMH |
| Voltage | 3.7 Volts |
| Capacity | 750 mAh (Milliamp Hours) |
| Product Dimensions | 4.4 x 2.1 x 0.5 cm |
| Date First Available | Aug. 25 2022 |
8. Warranty and Support
Otech batteries are individually tested before shipment to ensure functional equipment. For specific warranty details and support inquiries, please refer to the purchase documentation or contact your retailer. For technical assistance or questions regarding the battery, please reach out to the seller specializing in batteries and chargers.