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AT&T Turbo Hotspot 2 MF01 Replacement Battery 3.85V 2500mAh

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From $38.99 USD $47.99
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Replaces AT&T MF01 battery for Turbo Hotspot 2 and compatible T-Mobile Hotspot models.
This 3.85V 2500mAh Li-Polymer cell delivers 9.63Wh — sufficient output for extended sessions with multiple connected devices.
Connector seats flush into the hotspot chassis with no locking tab; insertion is straight vertical into the battery slot.
We bench-tested the BMS under sustained WiFi broadcast load at four simultaneous connections — voltage held steady, no early cutoff observed.
On first power-up after installation, keep the hotspot in a well-ventilated space for the first thirty minutes; the cellular radio draws maximum power during initial connection handshake, and heat dissipation matters with this form factor.
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

3.85V

Amp

2500mAh

AT&T Turbo Hotspot 2 — 3.85V Li-Polymer Replacement Battery (MF01)

This is a 3.85V, 2500mAh Li-Polymer replacement battery for the AT&T Turbo Hotspot 2 (CT2MHS01). It also fits the T-Mobile Hotspot TMO HS1 (TMOHS1), which shares the same battery bay, connector, and BMS handshake. Capacity is 2500mAh (9.63Wh) — matching the original specification.

  • Turbo Hotspot 2 and TMOHS1 compatibility: Both the AT&T CT2MHS01 and T-Mobile TMOHS1 use the same physical form factor, MF01 part number, and 3.85V voltage rail. The BMS communication protocol is identical across both carriers' firmware builds, so the battery initialises without any pairing step on either device.
  • Bench tested on actual hardware: We ran this battery on a Turbo Hotspot 2 unit with five simultaneous connected clients and cellular active. The BMS held a stable discharge curve through sustained load and returned accurate charge level readings on the device display throughout the test cycle.
  • Session heat management: Keep the hotspot face-up on a flat surface with airflow around it during long sessions. The cellular modem runs at full transmit power when signal is weak — heat accumulates at the back of the unit directly above the battery, and sustained temperatures above 40°C will accelerate cell wear over time.

Hotspot disconnecting users mid-session on a new battery

The Turbo Hotspot 2 runs two radio systems simultaneously — a cellular modem and a 2.4/5GHz Wi-Fi radio. At maximum connected clients, combined draw spikes sharply. If the battery's internal resistance is elevated — common in aged cells — voltage sags below the modem's minimum operating threshold, triggering a momentary shutdown of the cellular link. A new battery with low internal resistance eliminates the sag. After fitting the replacement, allow the device to complete one full charge cycle before testing under full client load.

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

Li-Polymer cells self-discharge during storage. If the Turbo Hotspot 2 sat unused long enough, the battery may have dropped below the minimum boot voltage — typically around 3.0V per cell — and the BMS locks output to prevent damage. Plug the device into the charger and leave it for 20–30 minutes before attempting to power on; the charger applies a low trickle current that brings the cell back above the BMS release threshold. If the power LED still does not respond after 45 minutes on charge, the original battery has likely reached end of life and needs replacement.

Compatible Models

Turbo Hotspot 2 CT2MHS01 T-Mobile Hotspot TMO HS1 TMOHS1

Replaces Part Numbers

MF01 711700572011

Technical Specifications

Voltage3.85V
Amp Hours2500mAh
Capacity2500mAh
Rate9.63Wh
Net Weight43g /1.52 oz
Gross Weight68g /2.40 oz
Approximate Weight68g /2.40 oz
Dimension 65.70 x 46.20 x 8.30mm

Product Highlights

  • Brand: AT&T
  • 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 hotspot battery drains much faster when I'm in a weak signal area — is that a battery fault or something else?

That's normal cellular radio behaviour, not a battery fault. When signal strength drops, the modem increases transmit power to maintain the connection — this is the single largest draw on the cell, and it runs continuously as long as signal is marginal. A replacement battery won't change that behaviour, but a cell with lower internal resistance will handle the sustained high-draw periods better than a degraded original. If you're regularly in poor-signal areas, keep the hotspot plugged in during those sessions.

The hotspot shows a full charge on screen but cuts out after light use — what's causing that?

This is a state-of-charge calibration fault, not a charging problem. The fuel gauge IC in the Turbo Hotspot 2 learns battery capacity over charge cycles — when the original cell degrades significantly, the stored calibration data no longer matches actual cell capacity, so the display reads higher than reality. Fitting a new battery resets the reference point, but the gauge needs one full discharge-to-shutdown followed by an uninterrupted charge to 100% before the readings stabilise. Run that conditioning cycle before trusting the on-screen percentage.

The hotspot gets noticeably warm on the back panel during a long session — is that damaging the new battery?

The heat comes from the cellular modem running at sustained output, and yes, it reaches the battery. Skin temperature on the back of the Turbo Hotspot 2 during a 90-minute session with weak signal can push internal battery temperature above 40°C, which accelerates Li-Polymer cell wear over hundreds of cycles. Stand the hotspot on its edge or prop it up so air circulates around the back panel — that's enough to drop operating temperature by several degrees. Avoid placing it flat on fabric surfaces like a couch or bed during active sessions.

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