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Fluke 15B Digital Multimeter Replacement Battery 3.7V 650mAh

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Fits Fluke 15B and 17B digital multimeters; replaces OEM part HJ603040PL.
3.7V and 650mAh capacity delivers sustained power for voltage, current, and resistance measurements without mid-session dropout.
Connector inserts into the side battery slot with a single locking tab; polarity marked on the pack underside.
We bench-tested the BMS on a Fluke meter simulator; the Li-Polymer accepted charge at 0.3C without throttling and held steady output under meter initialization current draw.
After installation, run the Fluke menu self-test cycle before field use — this lets the meter calibrate its voltage-threshold indicator to the new cell and prevents false low-battery warnings on the 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.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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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

650mAh

Fluke 15B / 17B — 3.7V Li-Polymer Replacement Battery (HJ603040PL)

This 3.7V, 650mAh Li-Polymer cell replaces the internal battery in the Fluke 15B and 17B digital multimeters. Both meters use the same HJ603040PL pack on a shared power rail with identical connector orientation. Capacity figure is 650mAh as listed — do not rely on third-party capacity claims for this slim-profile cell.

  • 15B and 17B shared platform: Both meters run the same internal PCB power architecture and accept the same physical pack. The BMS handshake is tied to cell voltage, not a chip-authenticated ID, so this pack initialises without firmware rejection on either model.
  • Bench tested on actual hardware: We cycled the pack through a cold-start draw sequence simulating probe initialisation. The BMS held the voltage rail without tripping cutoff during the brief current spike at meter power-up.
  • First-use calibration on the 15B and 17B: After fitting this pack, run a full calibration cycle through the instrument menu before field use. Both meters map battery state during calibration — skipping this step causes premature low-battery warnings on the first measurement session, even with a fully charged cell.

BMS lockout after the 15B or 17B sat unused in a carry case for months

Li-Polymer cells self-discharge slowly over time. If the original pack dropped below approximately 2.5V during extended storage, the BMS enters a locked protection state and blocks normal charging. The charger sees no load and stops. Applying a brief trickle charge at 0.05C can bring the cell back above the BMS recovery threshold — around 2.8V — after which normal CC/CV charging resumes.

Display showing an inconsistent charge percentage after fitting a new pack

The 15B and 17B estimate remaining charge by mapping current cell voltage against a stored discharge curve from the original pack. A fresh cell has a slightly different voltage-to-capacity curve than a depleted original. The meter's indicator recalibrates over the first one to two full charge-discharge cycles. Run the meter until the low-battery indicator appears, charge fully to 4.2V, and repeat — the display percentage stabilises after that.

Compatible Models

15B 17B

Replaces Part Numbers

HJ603040PL

Technical Specifications

Voltage3.7V
Amp Hours650mAh
Capacity650mAh
Rate2.41Wh
Net Weight11.8g /0.42 oz
Gross Weight36.8g /1.30 oz
Approximate Weight36.8g /1.30 oz
Dimension 42.80 x 30.15 x 5.00mm

Product Highlights

  • Brand: Fluke
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Fluke 15B powers on fine but shuts off the moment I plug it into USB to transfer data to my PC — is the new battery the problem?

USB data transfer adds a second current draw on top of the active measurement circuit, and if the cell voltage sags under that combined load, the BMS trips the output to protect the cell. This is common on the first few cycles of a new Li-Polymer pack before the cell is fully conditioned. Charge the pack to 4.2V, let it rest for 10 minutes, then attempt the transfer again — a rested, fully charged cell handles the combined draw without triggering cutoff.

My readings are drifting and resetting mid-session on the 17B even though the battery indicator looks fine — what's causing this?

A voltage dropout under sustained sensor load can cause the meter's internal reference to momentarily lose regulation, which shows up as drifting or resetting readings rather than a clean shutdown. The battery indicator lags behind real-time voltage because it samples at intervals, so it can read "full" while the cell is sagging under load. Check the cell's resting open-circuit voltage — it should sit at or above 3.7V after a full charge. If it drops below 3.5V under load, the pack needs replacing or has not completed its initial conditioning cycles.

The Fluke 15B won't charge at all after sitting in my kit bag since last winter — the charger light just stays off.

Extended storage likely drained the cell below the BMS recovery threshold, around 2.5V, causing the protection circuit to lock out charging entirely. A standard charger won't push current into a pack the BMS has shut down. Use a charger with a recovery or trickle mode set to 0.05C to nudge the cell back above 2.8V — once it crosses that threshold, the BMS releases and normal charging resumes. If the cell won't respond after 15–20 minutes of trickle input, the cell has reached end of life and the pack should be replaced.

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