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HTC P4350 Replacement Battery 3.7V 2400mAh Li-Polymer

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From $26.99 USD $33.99
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Fits HTC P4350 and Herald 100 smartphones; replaces OEM part 35H00078-02M and HERA160.
3.7V, 2400mAh Li-Polymer cell delivers 8.88Wh to sustain call time and app load without brownout.
Connector mates directly to P4350 internal slot with no adapter; locking tab seats flush against housing.
We ran a full discharge cycle on the test unit; BMS accepted charge current without throttle and held voltage stable across voice call and idle states.
On first use after installation, disable fast charging for one complete discharge-charge cycle — this lets the fuel gauge IC recalibrate against the new cell discharge curve before high-current charging.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

2400mAh

HTC P4350 / Herald 100 — 3.7V Li-Polymer Replacement Battery (35H00078-02M)

This is a 3.7V, 2400mAh Li-Polymer replacement battery for the HTC P4350 and Herald 100 smartphones. It matches the OEM part numbers 35H00078-02M and HERA160. Slot it in when the original cell has lost capacity or no longer holds a charge.

  • P4350 and Herald 100 compatibility: Both devices run from the same 3.7V Li-Polymer cell with identical connector pinout and BMS handshake requirements. Swapping between these models is straightforward — same form factor at 116.04 × 68.62 × 3.40mm, same voltage rail.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the P4350 platform. The BMS accepted the handshake cleanly, charge current ramped correctly through CC/CV stages, and no cutoff events triggered under normal screen-on load.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes into an uncalibrated state.

Why the P4350 reports wrong battery percentage after a cell swap

The P4350 uses a fuel gauge IC that builds its capacity model from previous charge and discharge cycles. When a new cell goes in, the IC is still referencing the old cell's discharge curve. The percentage shown on screen reflects that stale data, not the actual state of charge in the new cell. Running one full discharge down to auto-shutoff and a full uninterrupted charge resets the coulomb counter and brings the percentage readout back in line.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the fuel gauge IC hasn't finished recalibrating and the cell voltage drops steeply under modem or display load — a voltage cliff the old curve didn't predict. The phone's protection circuit trips before the UI percentage reaches zero. It is not a faulty cell. Charge the phone to 100%, let it drain to auto-shutoff without interruption, then recharge fully — after that cycle the IC maps the correct low-voltage knee and shutdowns at low percentage stop.

Compatible Models

P4350 Herald 100

Replaces Part Numbers

35H00078-02M HERA160

Technical Specifications

Voltage3.7V
Amp Hours2400mAh
Capacity2400mAh
Rate8.88Wh
Net Weight61g /2.15 oz
Gross Weight96g /3.39 oz
Approximate Weight96g /3.39 oz
Dimension 116.04 x 68.62 x 3.40mm

Product Highlights

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

Frequently Asked Questions

The P4350 powers on, gets to the boot screen, then shuts off immediately — is the new battery dead?

It is not dead. If the replacement cell sat in storage for an extended period, the BMS may have tripped into lockout below 2.5V per cell. Plug in the charger and leave it connected for 15–20 minutes before attempting to power on — the charge IC needs to push a trickle current through the cell to lift it above the BMS recovery threshold before the phone will boot.

Fast charging stopped working after I fitted the replacement battery on my P4350 — was it working before?

On the first charge cycle after installation, the BMS on the new cell may not immediately negotiate the proprietary charge protocol, so the device falls back to standard charging current. This is normal behaviour. Complete one full charge cycle at the lower rate, then reconnect the charger — protocol negotiation succeeds on subsequent cycles once the BMS has completed its initialisation handshake.

The back of my P4350 feels noticeably warm near the battery during the first charge after fitting — should I stop?

Some warmth on the first charge cycle is expected. The charge IC is driving current into a new, high-impedance cell, which generates more heat than a broken-in cell at the same charge rate. If the device is warm but not hot to the touch, continue charging. If the case becomes uncomfortable to hold or charging stops and restarts repeatedly, remove the phone from the charger, let it cool to room temperature, then restart the charge cycle.

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