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Franklin Wireless R722 3.7V Replacement Battery BLP1800K 1700mAh

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From $23.99 USD $29.99
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Fits Franklin Wireless R722, R774, R775 hotspots; replaces OEM part BLP1800K.
3.7V at 1700mAh delivers 6.29Wh total — adequate for one full cellular session on the R722 before recharge needed.
Connector seats flush into the R722 battery slot with no locking tab; insert and press until seated flat.
We bench-tested this cell on an R722 under sustained WiFi broadcast at full strength; BMS held stable voltage curve through complete discharge cycle.
On first insertion, the R722 may take 30 seconds to recognize the new BMS — power off, reseat the battery once, then power on to establish handshake.
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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

3.7V

Amp

1700mAh

Franklin Wireless R722 / R774 / R775 — 3.7V Li-ion Replacement Battery (BLP1800K)

This is a 3.7V, 1700mAh Li-ion replacement battery for the Franklin Wireless R722, R774, and R775 mobile hotspots. It uses OEM part number BLP1800K and fits directly into the battery bay on all three models. Capacity is 1700mAh (6.29Wh) — use the product data figure, not third-party listings.

  • R722 / R774 / R775 shared platform: All three models run the same 3.7V battery bay, connector pinout, and BMS handshake protocol. A battery that initialises correctly on the R722 will register full charge state on the R774 and R775 without recalibration.
  • Bench tested on actual hardware: We ran this cell under combined modem-plus-WiFi load at maximum connected clients. The BMS held stable voltage through the draw cycle and did not trigger a low-voltage cutoff during normal multi-device sessions.
  • Cellular signal and battery load: In weak signal areas, the modem boosts transmit power to maintain the cellular link. Keep the hotspot near a window or elevated position — reducing the signal search cycle lowers radio draw and slows cell depletion between charges.

Why the R722 disconnects connected devices mid-session on a new battery

The R722 runs two radios simultaneously — a cellular modem and a WiFi transmitter. At maximum client connections, combined current draw spikes sharply, causing a brief voltage sag at the cell terminals. If the BMS detects terminal voltage dipping below its protection threshold during that spike, it cuts output to protect the cell. This is not a faulty battery — it is the BMS responding correctly to a momentary overload. Reducing connected clients or moving the hotspot closer to the cellular tower lowers the combined radio draw and keeps terminal voltage above the cutoff floor.

R722 won't power on after sitting unused for several weeks

Li-ion cells self-discharge slowly during storage, and the R722 draws a small standby current even when powered off. After several weeks on the shelf, the cell can drop below the minimum boot voltage the device needs to initialise — typically around 3.0V on this platform. The BMS may also lock the cell in a protection state that blocks normal charging. Connect the hotspot to a charger for 15–20 minutes before attempting to power it on; this allows the charger to push a recovery trickle current that brings the cell back above the BMS re-enable threshold of approximately 3.0V.

Compatible Models

R722 R774 R775

Replaces Part Numbers

BLP1800K

Technical Specifications

Voltage3.7V
Amp Hours1700mAh
Capacity1700mAh
Rate6.29Wh
Net Weight37g /1.31 oz
Gross Weight62g /2.19 oz
Approximate Weight62g /2.19 oz
Dimension 66.80 x 48.55 x 6.00mm

Product Highlights

  • Brand: Franklin Wireless
  • 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 R722 shows a full charge but the battery dies much faster when I'm in an area with weak cell signal — why?

In poor signal conditions, the cellular modem continuously ramps transmit power to maintain the network link, drawing significantly more current than in strong-signal areas. That sustained high radio draw depletes the 1700mAh cell far faster than normal usage patterns suggest. The battery indicator reads "full" because voltage looks healthy at rest, but load voltage under peak modem output tells a different story. Move the hotspot to a window or higher elevation to reduce signal-search cycles and cut that extra radio draw.

The R722 gets noticeably warm during long sessions — is that a battery issue or a device issue?

Extended sessions combine heat from the cellular radio, the WiFi transmitter, and the battery itself discharging under continuous load. The battery contributes when internal resistance rises — either from age in the original cell or from a new cell being pushed hard at maximum client connections. Heat accelerates capacity fade in Li-ion cells, so ventilation matters more than most users expect on a hotspot. Place the device on a hard, open surface rather than a pocket, bag, or soft furnishing to allow passive airflow around the battery compartment.

After I replaced the battery in my R774, the charge indicator jumped erratically — full one minute, 20% the next. How do I fix it?

This happens because the fuel gauge IC retains the capacity model from the old, degraded cell and misreads the new cell's voltage curve. The fix is a full discharge-and-charge cycle: run the hotspot under normal load until it shuts off automatically, then charge uninterrupted to 100% without using the device. This forces the gauge to re-map the new cell's voltage profile from floor to ceiling. After one complete cycle, the percentage reading stabilises and tracks accurately.

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