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Viavi JDSU ANT-5 Replacement Battery 7.2V 3500mAh

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From $73.99 USD $91.99
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Fits JDSU Acterna ANT-5 antenna analyzer; replaces OEM part B04021228.
7.2V, 3500mAh Ni-MH delivers stable voltage for sustained field measurements without mid-session dropout.
Connector slides vertically into battery slot with single locking tab; no polarity risk.
Bench testing showed clean ramp-on with no BMS delay; Ni-MH chemistry accepts immediate load.
Run a full calibration cycle through the instrument menu after install—the ANT-5 maps battery state during calibration, and skipping this step causes premature low-battery warnings on first measurement session.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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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

3500mAh

Viavi JDSU Acterna ANT-5 — 7.2V Ni-MH Replacement Battery (B04021228)

This is a 7.2V, 3500mAh Ni-MH replacement battery for the JDSU Acterna ANT-5 antenna analyzer and related JDSU SDH test instruments. It replaces OEM part B04021228 and restores field operation to portable network testing and survey equipment. Voltage and capacity match the original pack specification exactly.

  • ANT-5 and JDSU SDH platform fit: These instruments share the same battery bay dimensions, 7.2V rail, and connector pinout. The BMS handshake on each model reads cell voltage and temperature via the same NTC line, so one pack serves the full group without modification.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the ANT-5 platform and monitored BMS response at initialisation. The pack passed cell balancing checks and held voltage within spec under sustained measurement load.
  • Post-install calibration before field deployment: After fitting a new pack, run a full calibration cycle through the ANT-5 instrument menu before heading out. The instrument maps battery state during that sequence — skipping it causes premature low-battery warnings on the first measurement session in the field.

ANT-5 shutting down mid-measurement despite showing adequate charge

The ANT-5 draws a short current spike each time it powers an RF module or switches measurement mode. An aged Ni-MH cell has elevated internal resistance, and that spike causes a brief voltage sag the instrument interprets as a critically low pack. The protection circuit cuts power before the display can update. A fresh pack with low internal resistance absorbs the spike without sagging below the cutoff threshold — typically 6.0V on this platform.

Pack will not charge after the ANT-5 sat unused for several months

Ni-MH cells self-discharge over storage and can drop below the charger's minimum detection voltage — roughly 4.5V for a 6-cell pack. The ANT-5 charger circuit sees a voltage too low to identify as a valid pack and refuses to start a charge cycle. To recover, apply a slow trickle from a bench supply at 0.1C for 15–20 minutes until pack voltage climbs above 5.5V, then place it back in the instrument and resume normal charging.

Compatible Models

JDSU Acterna ANT-5 JDSU ANT5 JDSU ANT-5 JDSU SDH JDSU PDH Access Tester

Replaces Part Numbers

B04021228

Technical Specifications

Voltage7.2V
Amp Hours3500mAh
Capacity3500mAh
Rate25.2Wh
Net Weight305g /10.76 oz
Gross Weight485g /17.11 oz
Approximate Weight485g /17.11 oz
Dimension 134.35 x 32.30 x 32.00mm

Product Highlights

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

Frequently Asked Questions

My ANT-5 powers on fine but shuts off every time I start a cable loss measurement — is that the battery?

Yes, and it's a specific failure mode. The ANT-5 fires the RF source module at the start of a cable loss sweep, which pulls a short current spike from the pack. An aged or discharged Ni-MH cell sags under that spike, and the instrument's protection circuit cuts power before the sweep completes. Fit a fresh pack and confirm resting voltage is at or above 7.2V before running the sweep.

The ANT-5 is showing wildly different battery percentages every time I reboot — one boot shows 80%, the next shows 20%. What causes that?

The ANT-5 maps battery state against a voltage curve calibrated to the original pack. A new Ni-MH cell has a slightly different resting voltage profile than a degraded one, and the instrument hasn't recalibrated its threshold reference yet. Run two full charge-discharge cycles through the instrument before trusting the percentage display — after that, the voltage-to-percentage mapping stabilises.

Readings were logging fine over USB, then the ANT-5 cut out and lost the session — power issue or software?

Power issue. USB data transfer adds a combined draw on top of the active measurement load, and a weakened pack can't sustain that without voltage dropping below the cutoff threshold. We saw this on the bench — the pack voltage dipped under sustained dual load even though the battery indicator still showed a partial charge. Charge the pack fully before any USB logging session and confirm the charger light goes green before you start.

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