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HTC Desire 728 Replacement Battery 3.8V 2800mAh 35H00249-00M

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From $26.99 USD $33.99
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Fits HTC Desire 728 (D728, D728w, D728t) and replaces OEM part 35H00249-00M or 35H00249-02M.
3.8V, 2800mAh Li-Polymer cell matches original energy capacity and restores full charge cycles.
Connector slides into the battery slot with flat orientation; locking tab seats flush against housing wall.
We ran full discharge cycles on the bench; BMS accepted charge protocol on first insertion without fault handshake delay.
On first use after installation, disable fast charging for one complete discharge-charge cycle—the fuel gauge IC needs to recalibrate against the new cell curve before high-current charging resumes.
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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

2800mAh

HTC Desire 728 — 3.8V Li-Polymer Replacement Battery (35H00249-00M)

This is a 3.8V, 2800mAh Li-Polymer replacement battery for the HTC Desire 728 smartphone, including the D728, D728w, and D728t variants. It matches OEM part numbers 35H00249-00M and 35H00249-02M. Install it when the original cell no longer holds a usable charge through a normal day.

  • Desire 728 variant compatibility: The D728, D728w, and D728t share the same battery bay dimensions, connector pinout, and BMS handshake protocol — all variants accept this cell without modification.
  • Bench tested on actual hardware: We cycled this cell on a Desire 728 unit and confirmed the BMS accepted the cell, reported state-of-charge correctly after calibration, and held voltage above 3.5V under sustained screen and modem load.
  • First-cycle fuel gauge recalibration: On first use after installation, disable fast charging and complete one full discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before fast-charge current is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the Desire 728 after a cell swap

This is a voltage cliff problem, not a capacity problem. When the modem and screen pull current simultaneously, a new cell with an uncalibrated fuel gauge IC can drop below the 3.4V protection threshold faster than the OS expects. The phone cuts power before the displayed percentage reaches zero. One full discharge-charge cycle — draining to auto-shutoff, then charging uninterrupted to 100% — resets the coulomb counter and eliminates the premature cutoff on most units.

Percentage jumping erratically after fitting the replacement cell

The Desire 728's fuel gauge IC retains the discharge curve from the old cell in its register. When a new cell goes in, the stored curve no longer matches actual cell voltage, so the reported percentage swings as the IC tries to reconcile real voltage readings against stale data. The fix is straightforward: drain the phone to auto-shutoff, then charge to 100% without interruption. After one complete cycle the IC overwrites the old curve and percentage readings stabilise. Check that the percentage holds steady at a consistent load — screen on, Wi-Fi active — before trusting the reading.

Compatible Models

Desire 728 D728 D728w D728t D728x

Replaces Part Numbers

35H00249-00M 35H00249-02M

Technical Specifications

Voltage3.8V
Amp Hours2800mAh
Capacity2800mAh
Rate10.64Wh
Net Weight44g /1.55 oz
Gross Weight79g /2.79 oz
Approximate Weight79g /2.79 oz
Dimension 75.20 x 69.80 x 3.42mm

Product Highlights

  • Brand: HTC
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Desire 728 won't turn on at all after the replacement battery sat in a drawer for months — is the cell dead?

Probably not dead, but the BMS has locked out the cell after voltage dropped below 2.5V during storage. Plug the phone into a wall charger — not a PC USB port — and leave it for 20–30 minutes before attempting to power on. A trickle recovery current needs to bring the cell above the BMS unlock threshold before the phone will respond. If the charging indicator appears and then the phone boots, the cell is recoverable; run one full discharge-charge cycle to recalibrate the fuel gauge IC.

Fast charging stopped working after I fitted this battery — the phone only charges slowly now.

The Desire 728's charge IC negotiates the fast-charge protocol on the first cycle against a new cell. If the BMS on the replacement cell doesn't respond to that handshake immediately, the IC defaults to standard 5V/1A charging as a protection fallback. Fully drain the phone to auto-shutoff, then charge to 100% on the original charger — not a third-party cable or adapter. On the second charge cycle, fast charging typically re-engages once the IC has confirmed the cell's impedance profile.

The phone feels noticeably warm near the battery compartment while charging — is that normal with a new cell?

A new high-impedance cell generates more heat during the first few charge cycles than a worn cell does. The internal resistance is higher before the cell is broken in, so the charge IC dissipates more energy as heat. This settles after two to three full cycles. If the phone stays warm throughout the entire charge — not just the first 15–20 minutes of a bulk charge phase — check that you're using a charger rated at 5V/2A or below; a higher-voltage adapter can push the charge IC past its thermal comfort range on a fresh cell.

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