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D-Link DWR-933 B1 Replacement Battery 3.8V 2900mAh

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From $35.99 USD $44.99
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Fits D-Link DWR-933 B1 hotspot; replaces OEM part numbers DWRr800b and 6BT-R800B-2901.
3.8V, 2900mAh lithium-polymer cell delivers 11.02Wh to sustain multiple WiFi connections on cellular networks.
Connector slides into the battery slot with a positive contact tab; locking tab secures flush against the hotspot chassis.
Bench testing showed normal BMS voltage response under combined modem and WiFi load; no fault codes observed.
If the hotspot drops WiFi connections mid-session after battery swap, verify the contact tab sits fully seated inside the slot.
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.

Disclaimer

⚠️ 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

3.8V

Amp

2900mAh

D-Link DWR-933 B1 — 3.8V Li-Polymer Replacement Battery (DWRr800b)

This 3.8V, 2900mAh Li-Polymer battery replaces the original power cell in the D-Link DWR-933 B1 mobile hotspot router. It fits directly into the DWR-933 B1 chassis and matches the OEM voltage and connector spec. Capacity is 2900mAh (11.02Wh), identical to the factory-fitted cell.

  • DWR-933 B1 fitment: The DWR-933 B1 uses a dedicated Li-Polymer cell with a specific connector pinout and BMS handshake tied to that chassis. This replacement carries part numbers DWRr800b and 6BT-R800B-2901, matching the OEM electrical and mechanical spec exactly.
  • Bench tested on actual hardware: We ran this cell under combined WiFi and LTE radio load — the BMS held steady through the draw spike at maximum connected-device count, and the protection circuit triggered correctly at low-voltage cutoff without dropping the hotspot mid-session.
  • Ventilation during extended sessions: Keep the DWR-933 B1 on a hard, flat surface with airflow around it during long sessions. When signal is weak, the cellular radio runs at peak output power continuously, and heat buildup in a pocket or bag will accelerate cell degradation over time.

Why the DWR-933 B1 drops connected devices mid-session under full load

When all available client slots are active and the LTE signal is marginal, the combined modem and WiFi radio draw spikes sharply. An aged or degraded cell cannot sustain voltage under that surge, and the BMS triggers a protective cutoff before the battery is visually depleted. The hotspot reboots and all connected devices drop. A fresh cell with full capacity holds the voltage rail steady through those load spikes without tripping the cutoff.

DWR-933 B1 won't power on after sitting unused for several weeks

Li-Polymer cells self-discharge during storage, and the DWR-933 B1 requires a minimum voltage at the battery terminals before the firmware will boot — typically around 3.4V for this class of device. If the cell has dropped below that threshold, the hotspot shows no response when the power button is pressed. Connect the device to a charger and leave it for 20–30 minutes before attempting to power on — this allows the charger to bring the cell back above the minimum boot voltage before the BMS re-enables the output rail.

Compatible Models

DWR-933 B1

Replaces Part Numbers

DWRr800b 6BT-R800B-2901

Technical Specifications

Voltage3.8V
Amp Hours2900mAh
Capacity2900mAh
Rate11.02Wh
Net Weight50g /1.76 oz
Gross Weight75g /2.65 oz
Approximate Weight75g /2.65 oz
Dimension 64.50 x 50.00 x 8.00mm

Product Highlights

  • Brand: D-Link
  • 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 DWR-933 B1 hotspot keeps disconnecting everyone connected to it even though the battery indicator still shows charge — what's happening?

A battery indicator reading reflects state of charge, not the cell's ability to deliver current under load. When the LTE modem and WiFi radio are both running at maximum draw, a worn cell voltage sags below the BMS cutoff threshold even with charge remaining, causing a reboot that drops all connected users. This replacement cell sustains the voltage rail through those combined load spikes. If disconnects continue after fitting a new battery, check that the hotspot isn't being used in a low-signal area where the cellular radio is forced to run at peak power continuously.

The DWR-933 B1 battery drains noticeably faster in some locations than others — is the battery the problem?

In most cases, no — location is the variable. When the DWR-933 B1 is in a weak signal area, the cellular radio runs at maximum transmit power to maintain the connection, drawing significantly more current than in strong-signal coverage. Multiple devices connected simultaneously compounds this further. Move the hotspot to a window or elevated position to improve signal strength, which directly reduces radio power draw and slows battery drain. If drain is excessive even in strong-signal areas with few connected devices, the cell itself may have degraded below usable capacity.

The DWR-933 B1 powers on fine but shuts off randomly during use — not a low-battery warning, just an abrupt cutoff. What causes this?

This is a thermal or BMS protection event, not a standard low-battery shutdown. During extended sessions in warm environments, or when the hotspot is enclosed in a bag or pocket, cell temperature rises and the BMS cuts power to prevent damage. Check that the device has airflow on all sides during use. If the cutoffs happen even with good ventilation, test with the charger connected — if it runs stably on charge but cuts off on battery alone, the cell has degraded and the internal resistance is generating excess heat under load. Replace the battery and keep the device on a hard surface during long sessions.

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