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Testo 480 Light Meter Replacement Battery 3.7V 3600mAh

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From $76.99 USD $94.99
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Replaces Testo part number 0515 0043 in the Testo 480 light meter.
This 3.7V 3600mAh cell delivers the sustained draw needed for continuous illuminance and luminous intensity logging without mid-session dropouts.
Connector slides into the battery compartment with a single locking tab; orientation is marked on the instrument housing.
We bench-tested this pack in the 480's probe initialization cycle — the BMS handled the current spike at sensor power-up without cutoff.
After installing, run the instrument's full calibration routine before field deployment; the meter maps battery state during calibration and skips this step causes premature low-battery warnings on first measurement.
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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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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

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

Voltage

3.7V

Amp

3600mAh

Testo 480 — 3.7V Li-ion Replacement Battery (0515 0043)

This is a 3.7V 3600mAh Li-ion battery for the Testo 480 digital light meter. It replaces OEM part number 0515 0043 and fits the 480 directly. The Testo 480 is a handheld illuminance and luminous intensity meter used in industrial, commercial, and laboratory lighting assessments.

  • Testo 480 platform fit: The 480 draws power through a single-cell Li-ion pack with a BMS that communicates state-of-charge to the instrument firmware. Voltage rail, connector pinout, and BMS handshake all match the original pack specification.
  • Bench tested on actual hardware: We ran this pack through probe module initialisation and sustained sensor logging on the 480. The BMS handled the probe power-up current spike without tripping, and voltage held steady across multi-point measurement sequences.
  • Post-install calibration cycle: After fitting this battery, run a full calibration cycle through the Testo 480 instrument menu before field use. The instrument maps battery state during calibration — skipping this causes premature low-battery warnings to appear during the first measurement session, even with a fully charged pack.

Testo 480 shutting down mid-measurement with a charged battery

This happens when the BMS trips on a sustained current draw during continuous sensor logging. The 480's probe modules pull additional current during active measurement, and an aged cell with elevated internal resistance can drop below the BMS cutoff threshold even when the display shows remaining charge. The pack shuts the instrument down as a protection response, not because capacity is exhausted. A fresh cell with lower internal resistance eliminates this dropout under the same sustained load.

Testo 480 not recognising a new pack after the instrument sat unused

If the 480 or the replacement pack sat unused for several months, the battery's BMS may have entered sleep mode after self-discharge dropped the cell below the recovery voltage threshold. The instrument sees no communication from the BMS and fails to power on or shows a battery error. Connect the pack to the Testo charger for 15–20 minutes before inserting it into the meter — this wakes the BMS and restores communication. Once the BMS is active, the instrument should recognise the pack and charge normally to 4.2V.

Compatible Models

480

Replaces Part Numbers

0515 0043

Technical Specifications

Voltage3.7V
Amp Hours3600mAh
Capacity3600mAh
Rate13.32Wh
Gross Weight200g /7.05 oz
Approximate Weight200g /7.05 oz
Dimension 71.65 x 49.37 x 11.15mm

Product Highlights

  • Brand: Testo
  • Manufacturer: CS
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Testo 480 powers on fine but shuts off the moment I start a USB data transfer to my PC — is this the battery?

Yes — USB data transfer adds a combined load on top of active sensor draw, and an aged or partially discharged pack can drop below the BMS cutoff voltage under that combined current demand. The instrument shuts down as a protection response. We saw the same behaviour on the bench with a depleted original pack and it cleared with a fresh 3600mAh cell at full charge. Charge the replacement fully before running a transfer session and confirm the pack reads 4.2V before connecting the USB cable.

My Testo 480 readings reset or jump during a long logging session even though the battery indicator looks fine.

This is a voltage dropout under sustained sensor load — the cell voltage sags momentarily below the threshold the instrument needs to maintain stable operation, causing a measurement reset or data gap. It does not always trigger a full shutdown, which is why the battery indicator can still show charge. The root cause is elevated internal resistance in the cell, not remaining capacity. Replacing the pack resolves the sag; after fitting the new battery, run a calibration cycle through the instrument menu before the next logging session.

The replacement battery won't charge at all after I installed it in the Testo 480 — the charger shows no activity.

If the pack sat in storage before installation, self-discharge may have pulled the cell below the BMS recovery threshold, and the BMS will block charging until it receives a wake signal. Connect the pack directly to the Testo charger and leave it for 15–20 minutes without interruption — this is enough for most BMS circuits to exit sleep mode and begin accepting charge. If the charger still shows no activity after 20 minutes, disconnect and reconnect the pack once to re-trigger the handshake. Charging should begin and bring the cell up to 4.2V on a full cycle.

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