The N7BN4 replacement battery works in some Planix 5, Planix 6 and Planix 7 planimeters. Please check your planimeter's serial number and refer to the notes below before purchasing:
Planix 5:
- If the serial number is 2734 or greater, this is the correct replacement battery.
Planix 6:
- If the serial number is 3071 or greater, this is the correct replacement battery.
Planix 7:
- If the serial number is 19500 or greater, this is the correct replacement battery.
Warranty:
- Manufacturer's 90 day warranty