Keysight / Agilent / HP E9287A Replacement Battery

The E9287A is a 12V Nickel-Metal Hydride spare battery engineered for Keysight, Agilent, and HP power meter systems requiring field or laboratory battery backup. This NiMH battery serves as a direct replacement for compatible EPM and E-series power meters, enabling uninterrupted measurement operations. Note: This is an obsolete part.

## Technical Specifications

• **Battery Type:** Nickel-Metal Hydride (NiMH)
• **Voltage:** 12V
• **Chemistry:** Nickel-Metal Hydride (NiMH)

Capacity decreases progressively with charge-discharge cycling. Performance degrades significantly below -10°C (14°F) and in extreme heat. Battery recovery is not possible after extreme discharge or storage exceeding two months.

## Key Features

• 12V output for direct integration with supported power meter models
• Removable design allows field replacement without service interruption
• Compatible with firmware-dependent runtime display on select E-series meters
• Operates reliably in controlled laboratory and field environments

## Typical Applications

• RF and microwave power measurement systems requiring portable operation
• Continuous testing in field installations without mains power
• Backup power for Keysight EPM series power meters
• Mobile calibration and verification operations

## Compatibility & Integration

**Keysight EPM Power Meters** with Option 001 installed

**Keysight EPM-P Power Meters** with Option K01 installed

**Agilent E4418B Power Meter** — Requires firmware release A1.06.00 or later for accurate battery runtime display

**Agilent E4419B Power Meter** — Requires firmware release A2.06.00 or later for accurate battery runtime display

**Agilent E4416A Power Meter** — Requires firmware release A1.04.07 or later for accurate battery runtime display

**Agilent E4417A Power Meter** — Requires firmware release A2.04.07 or later for accurate battery runtime display

Firmware versions earlier than those specified may produce self-test failures and incorrect runtime scaling. Storage temperature range: 15°C to 25°C (59°F to 77°F). A fully charged battery retains a low-level charge for up to two months. Follow local regulatory requirements for NiMH battery disposal.