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Honeywell Thor VM3 Replacement Battery 7.4V 5200mAh

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From $52.99 USD $65.99
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Fits Honeywell Thor VM3 windshield-mount terminals; replaces OEM part 50139885-001 and equivalent cross-references.
7.4V and 5200mAh capacity deliver full charge cycles for extended delivery and field-service shifts without mid-route power loss.
Connector seats flush into the Thor VM3 hot-swap slot with positive terminal contact aligned; locking tab secures during vehicle vibration.
We bench-tested this cell in a Thor VM3 dock; BMS accepted the pack on first insertion with no fault handshake delays.
Charge this battery fully before hot-swapping into an operating terminal — the VM3 draws peak current during ignition cycles and an undercharged pack will not bridge the power gap during vehicle start.
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.

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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

7.4V

Amp

5200mAh

Honeywell Thor VM3 — 7.4V Li-ion Replacement Battery (50139885-001)

This 7.4V, 5200mAh Li-ion battery replaces the OEM unit in the Honeywell Thor VM3 vehicle mount terminal. The Thor VM3 is a windshield-mounted rugged computer used in logistics, delivery, and field service fleets. It cross-references OEM part numbers 50139885-001, L3-52301624A-R, OVT270L1R00, OVT270L1R01, and 50121692-001.

  • Thor VM3 platform fit: The VM3 uses a dedicated battery bay with a specific connector and BMS handshake tied to Honeywell's power management stack. This replacement matches that voltage rail and communication protocol so the terminal recognises the pack on boot.
  • Bench tested on actual hardware: We cycled this pack through multiple charge and discharge passes on the VM3 platform. The BMS passed cell authentication, reported accurate state-of-charge to the terminal OS, and held voltage above the 6.0V cutoff threshold under sustained load.
  • Hot-swap pre-charge requirement: Charge this battery fully before using it as a hot-swap unit. During vehicle ignition start, the VM3 draws peak current for the boot sequence — an undercharged hot-swap battery may not sustain the terminal through that 3–10 second gap, causing a cold reboot.

Hot-swap battery not bridging power during ignition start

The Thor VM3 relies on the hot-swap battery to keep the terminal alive during vehicle ignition cycling. When the main vehicle power drops momentarily at crank, the terminal pulls from the hot-swap pack. If that pack is below roughly 7.0V, the BMS may refuse to supply current under load, and the terminal resets. This is not a faulty battery — it is a charge-state issue. Bring the hot-swap battery to a full charge before swapping it into the hot-swap slot.

Terminal not booting when running on battery alone

The VM3 requires a minimum voltage at the power rails before its boot sequence will initialise. A battery that has sat unused for several months may have self-discharged below that threshold — typically under 6.5V — and the terminal simply will not respond. Connect the terminal to vehicle power or an external charger for 20–30 minutes to bring the cell voltage back above 7.0V, then attempt a standalone boot again.

Compatible Models

Thor VM3

Replaces Part Numbers

50139885-001 L3-52301624A-R OVT270L1R00 OVT270L1R01 50121692-001

Technical Specifications

Voltage7.4V
Amp Hours5200mAh
Capacity5200mAh
Rate38.48Wh
Net Weight180g /6.35 oz
Gross Weight320g /11.29 oz
Approximate Weight320g /11.29 oz
Dimension 132.50 x 42.50 x 19.00mm

Product Highlights

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

Frequently Asked Questions

My Thor VM3 loses all data every time the ignition cycles — is the hot-swap battery the problem?

Yes, almost always. The hot-swap battery has to be at full charge to bridge the momentary power drop during engine crank. If it is partially discharged, the VM3 sees a power gap of more than a few milliseconds and triggers a cold reboot, wiping any unsaved session data. Charge the hot-swap battery fully before inserting it into the hot-swap slot — check that it reads at or above 7.2V before fitting.

The Thor VM3 takes a very long time to come back after a power interruption — is something wrong with the battery?

Nothing is wrong. The VM3 boot sequence is inherently slow — the terminal runs a full hardware and software initialisation that typically takes 30 to 60 seconds after power is restored. What looks like a battery recovery delay is almost always the OS loading, not the pack struggling. If the terminal fails to complete the boot entirely, check that the battery voltage is above 6.5V before power is applied.

The replacement battery shows as fully charged but the Thor VM3 reports a low battery warning almost immediately — what is happening?

This points to a state-of-charge calibration mismatch between the new pack and the terminal's battery gauge. The VM3 reads cell data via the BMS, and a fresh pack sometimes needs one full discharge-to-cutoff and recharge cycle before the reported percentage tracks accurately. Run the terminal on battery only until the VM3 shuts down on low voltage, then charge uninterrupted to 100% — after that cycle, the gauge reading should stabilise.

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