Nihon Kohden NKB-301V Battery Compatible for TEC-7621C 7631C 7700 5521 5531 ECG Machine

The Nihon Kohden NKB-301V Battery is a compatible replacement battery designed for use with TEC-7621C, 7631C, 7700, 5521, and 5531 ECG Machines.

1. Power off: Turn off the electrocardiograph and unplug the power adapter.
2. Remove the old battery: Usually located on the back or side of the device, release the battery compartment by sliding/pressing the clip.
3. Install the new battery: Align the contacts and make sure the battery is fully inserted and locked.
4. First charge: Fully charge using the original charger (about 3~4 hours) to activate the battery performance.

• Do not short-circuit, disassemble or store the battery in a high temperature environment.
• If the battery swells or leaks, stop using it immediately and dispose of it professionally.
• When not in use for a long time, charge it 50% every 3 months to keep the battery healthy.
• Avoid complete discharge.
• Avoid exposing the battery to extreme temperatures, especially in high temperature and high humidity environments.
• If overheating is detected during use, stop using immediately and check the battery.
• Avoid metal objects contacting the positive and negative poles to prevent short circuits.
• Regularly check the battery appearance. Stop using immediately if swelling or leakage occurs.
• Recycle used batteries properly according to regulations.
• Do not use the battery beyond rated current and voltage specifications.

• Unable to charge: Check the charger port or battery contacts for oxidation.
• Sudden drop in power: The battery is aging (cycle life is about 300~500 times) and needs to be replaced.

• 12-lead ECG recording (standard I, II, III, aVR, aVL, aVF, V1-V6)
• LCD display: real-time display of ECG waveform
• Built-in storage: can store multiple copies of ECG data
• Print output: supports thermal printing (some models require external printer)
• Battery power supply: supports mobile use (rechargeable battery)
• PC connection: some models support USB or Bluetooth data transmission

We provide a long warranty period of 90 days. Different batteries have different warranty periods. Please contact us to check the warranty details.

Express delivery methods include DHL, FedEx, UPS, etc. We will ship your order within 3-5 working days after payment is completed. Shipping costs depend on your country and region.