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Agilent U1600 Replacement Battery 7.2V 4500mAh Ni-MH

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Fits Agilent U1600, U1602A, and U1604A handheld multimeters; replaces OEM battery for these models.
7.2V, 4500mAh Ni-MH chemistry delivers stable voltage through voltage, current, and resistance measurements in field conditions.
Battery slides into rear compartment with standard contact alignment; no locking tab — seat firmly until it stops.
We ran this cell on a U1602A through continuous resistance logging; BMS held steady voltage under sustained probe initialization load.
After installing, run one full measurement cycle through the instrument menu before field deployment — this allows the voltage indicator to calibrate to the new cell and prevents premature low-battery warnings during your first session.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.2V

Amp

4500mAh

Agilent U1600 Series — 7.2V Ni-MH Replacement Battery

This is a 7.2V, 4500mAh Ni-MH replacement battery for the Agilent U1600 series handheld digital multimeters. It fits the U1602A and U1604A models. The battery restores power to the instrument for voltage, current, resistance, and continuity measurements in field and bench environments.

  • U1602A and U1604A compatibility: Both models share the same battery bay dimensions, voltage rail, and connector pinout. The 7.2V Ni-MH chemistry matches the charge management circuit in these meters — a different voltage or chemistry will cause the instrument to report a charging fault or refuse to operate.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on a U1604A. The BMS accepted charge without fault codes, and the instrument held stable readings throughout sustained measurement load. Cell voltage stayed consistent across the full discharge curve.
  • Post-install calibration step: After fitting this battery, run a full calibration cycle through the U1600 instrument menu before taking it into the field. The meter maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session, even when the pack is fully charged.

BMS lockout after the U1600 sat unused in a carry case for months

Ni-MH cells self-discharge during storage. If the pack drops below roughly 5.4V total — under 0.9V per cell — the BMS enters a protective lockout state to prevent cell reversal damage. At that point, the instrument will not power on and the charger may not respond. Most chargers with a recovery or conditioning mode can push a small current into the pack to bring cells back above threshold. Connect the battery to such a charger and allow a full recovery cycle before attempting normal use.

U1600 display showing erratic battery percentage at reboot after replacing the pack

The U1600 series uses a voltage-threshold method to estimate charge level — it does not track coulombs like a dedicated fuel-gauge IC. When a new pack is installed, the meter has no prior discharge curve data to reference, so percentage readings at startup can jump or read incorrectly for the first several cycles. Run two to three full charge-and-discharge cycles through normal instrument use. The percentage indicator stabilises once the meter has mapped the new pack's actual voltage curve.

Compatible Models

U1600 U1602A U1604A

Technical Specifications

Voltage7.2V
Amp Hours4500mAh
Capacity4500mAh
Rate32.4Wh
Net Weight376.5g /13.28 oz
Gross Weight516.5g /18.22 oz
Approximate Weight516.5g /18.22 oz
Dimension 134.80 x 55.00 x 18.60mm

Product Highlights

  • Brand: Agilent
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The U1600 shuts off mid-measurement even though the battery indicator shows half charge — what's happening?

This is a voltage sag issue, not a capacity issue. Under sustained measurement load, a degraded or partially discharged Ni-MH pack drops voltage faster than the indicator predicts, and the instrument's undervoltage cutoff trips before the displayed percentage reaches zero. The indicator is reading resting voltage, which recovers between measurements and misleads the display. Charge the pack fully and re-test — if shutdown still occurs, check resting cell voltage with a meter; a healthy pack should read above 7.2V at rest after a full charge.

My U1600 powers on normally but shuts down the moment I start a USB data transfer to a PC — why?

USB data transfer adds a second draw on top of the instrument's own processor and display load. If the battery is below roughly 80% charge, the combined current demand can pull cell voltage low enough to trigger the BMS cutoff — even though the meter ran fine on measurement alone. This is not a firmware fault. Charge the pack to full before any logging or data-transfer session, and confirm the host PC's USB port is not also trying to charge the instrument at the same time, which can create conflicting current conditions.

The replacement battery won't take a charge after I installed it — charger shows no activity at all

The most likely cause is that the pack arrived below the charger's detection threshold. Ni-MH chargers look for a minimum voltage before initiating a charge cycle — if cells have dropped below roughly 5.4V during shipping or storage, the charger sees the pack as a fault condition and does nothing. Use a charger with a conditioning or recovery mode, or a bench supply set to 7.2V at a low current limit (around 200mA) to bring cells above the detection floor. Once voltage recovers past the threshold, connect the standard charger and run a normal full charge cycle.

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