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Moxee BP1672 Replacement Battery 3.7V 1840mAh Li-ion K779

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From $24.99 USD $30.99
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Fits Moxee K779, K779HSDG_P, K779HSDL hotspots; replaces OEM battery BP1672.
3.7V at 1840mAh (6.81Wh) — matches original capacity for full session runtime on cellular.
Connector seats into vertical slot with locking tab; orientation marked on housing underside.
We bench-tested this cell under combined WiFi broadcast and 4G modem draw; BMS held stable voltage throughout discharge cycle.
Keep the hotspot in well-ventilated areas during extended sessions — the cellular radio at maximum output generates significant heat that stresses this battery.
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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

1840mAh

Moxee K779 Series — 3.7V Li-ion Replacement Battery (BP1672)

This is a 3.7V, 1840mAh Li-ion replacement battery for the Moxee K779 mobile hotspot. It fits the K779, K779HSDG_P, and K779HSDL variants. Swap it when the original cell can no longer hold enough charge to keep the hotspot running through a full session.

  • K779 variant compatibility: The K779, K779HSDG_P, and K779HSDL all share the same battery bay dimensions, connector pinout, and BMS handshake protocol — the BP1672 cell fits and communicates correctly across all three.
  • Bench tested on actual hardware: We ran this cell under combined modem and Wi-Fi load with six connected clients. The BMS held steady through the draw cycle, showing no spurious low-voltage cutoff events.
  • Ventilation during extended sessions: Keep the K779 on a hard flat surface with the vents clear during long sessions. When connected devices are far away, the cellular radio pushes to maximum output power — that heat feeds directly into the battery cavity and accelerates cell wear.

Why the K779 drops all connected clients mid-session

The K779 runs two power-hungry subsystems simultaneously — the cellular modem and the Wi-Fi radio. At maximum client count, the combined draw can spike voltage below the BMS cutoff threshold, triggering a protective shutdown. A degraded cell has less headroom to absorb these spikes. A fresh 1840mAh cell restores that buffer, so the BMS does not trip during normal multi-device loads.

K779 showing solid power LED but refusing to boot

When a Li-ion cell discharges below roughly 3.0V during storage, the BMS locks out normal boot to protect the cell. The hotspot may show an LED response but the system will not initialise. Connect the K779 to its original charger for at least 15–20 minutes before attempting a power-on — this brings the cell above the BMS re-enable threshold. If the device still will not boot after that charge window, measure terminal voltage at the battery; anything below 3.2V confirms the old cell needs replacement.

Compatible Models

K779 K779HSDG_P K779HSDL

Replaces Part Numbers

BP1672

Technical Specifications

Voltage3.7V
Amp Hours1840mAh
Capacity1840mAh
Rate6.81Wh
Net Weight41g /1.45 oz
Gross Weight66g /2.33 oz
Approximate Weight66g /2.33 oz
Dimension 72.00 x 45.10 x 7.30mm

Product Highlights

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

Frequently Asked Questions

My K779 kicks all connected devices off every hour or so — why does this keep happening with the new battery?

This usually points to a voltage sag event under peak load, not a defective battery. When the hotspot is serving its maximum client count in a weak signal area, the cellular modem ramps to full transmit power while the Wi-Fi radio is also at peak draw — that combined spike can momentarily pull cell voltage below the BMS cutoff. Make sure the hotspot is positioned for the best available signal and reduce the connected device count during heavy use sessions. If drop-outs continue, check that the battery terminal voltage reads at or above 3.7V after a full charge cycle.

The K779 battery drains significantly faster than it used to — could it be the cellular band it's on?

Yes, band selection directly affects drain rate. When the K779 falls back to a congested or weak 4G cell, the modem continuously retransmits and holds maximum radio power output, which is the single largest drain on the 1840mAh cell. Moving the hotspot closer to a window or higher position often drops the modem back to a stronger signal level and measurably extends run time per charge. If drain is excessive even in good signal conditions, check whether a firmware update is available — some K779 firmware versions include modem power management fixes.

My K779 sat unused for two months and now it won't turn on at all — is the battery dead?

Li-ion cells self-discharge during storage, and two months is enough time for the K779's cell to drop below the minimum boot voltage of around 3.0V. The BMS blocks startup below that threshold to prevent damage. Plug the hotspot into its charger and leave it connected for at least 20 minutes before pressing the power button — do not attempt to boot it immediately. If the device still does not respond after that initial charge window, the original cell has likely discharged too deeply to recover and the BP1672 replacement cell is the correct next step.

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