9V Ni-MH 250mAh Rechargeable Battery 6F22 PP3 for Wireless Microphones and Alarms

Technical Details

• Full Charge Voltage: ~9.6V

• Standard Charge Current: 25mA (14–16 hours)

• Quick Charge Current: ~125mA (with smart timer/delta-V charger)

• Operating Temperature: -10°C to +50°C

• Self-Discharge Rate: Modern low self-discharge formula

• Weight: Approx. 35g to 45g

Prototyping and Engineering Tips from Robogears

• Voltage Difference: A rechargeable "9V" Ni-MH battery actually consists of 7 cells in series, giving it a nominal voltage of 8.4V. While most 9V devices work perfectly with this, some sensitive precision instruments may report a "low battery" sooner than they would with a 9.5V fresh alkaline.

• Arduino Portability: This is the perfect companion for an Arduino Uno using the DC jack. Since it's rechargeable, you can test your robot code hundreds of times without buying new batteries. If your robot uses heavy motors, the 250mAh capacity will drain in about 30–60 minutes; for longer runtimes, consider using this only for the "brain" (logic) and a separate pack for the "brawn" (motors).

• Charging Safety: Use only a dedicated Ni-MH 9V charger. Do not use an old Ni-Cd charger unless it specifically lists Ni-MH compatibility, as Ni-MH cells are more sensitive to overcharging heat.

• Storage Logic: If you aren't using your project, disconnect the battery snap. Even in "off" mode, some circuits have a tiny parasitic draw that can over-discharge a Ni-MH battery to 0V, which may damage its ability to hold a full charge again.

Package Includes

• 1 x 9V 250mAh Ni-MH Rechargeable Battery

Disclaimer Images are for reference; actual labeling or brand color may vary by batch. Specifications subject to change by manufacturer. Do not short-circuit or dispose of in fire.