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HTC Touch Pro 2 BA S390 Replacement Battery 3.7V 2800mAh

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From $26.99 USD $33.99
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Fits HTC Touch Pro 2, Touch Pro II (T7373) — replaces OEM battery BA S390 and equivalent part numbers.
3.7V Li-ion at 2800mAh delivers the capacity this Windows Mobile device needs for full daily operation.
Connector slides straight into the original slot with no modification — locking tab seats flush against the housing.
We ran a full discharge cycle and monitored the BMS; voltage curve held stable across load without early cutoff signals.
On first charge after installation, let the fuel gauge IC complete one full discharge-charge cycle before heavy use — the coulomb counter needs to recalibrate against this cell's discharge curve to prevent percentage reporting drift.
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

3.7V

Amp

2800mAh

HTC Touch Pro 2 — 3.7V Li-ion Replacement Battery (BA S390)

This is a 3.7V, 2800mAh Li-ion replacement battery for the HTC Touch Pro 2 smartphone. It fits the T7373 and RHOD100 variants, sold under model names Touch Pro II as well. The OEM part numbers BA S390, RHOD160, 35H00123-00M, and 35H00123-02M all cross to this cell.

  • Touch Pro 2 platform compatibility: The T7373 and RHOD100 share the same battery bay, connector pinout, and BMS handshake requirements. Any variant sold as Touch Pro II draws from the same voltage rail at 3.7V nominal, so one cell covers the full line.
  • Bench tested on actual hardware: We cycled this cell through the Touch Pro 2's charge IC and confirmed the BMS communicates correctly with the Windows Mobile power stack. Charge termination triggered at the correct cutoff voltage with no error flags logged.
  • Fuel gauge recalibration on first use: After fitting this cell, run one full discharge down to automatic shutdown, then charge uninterrupted to 100% before use. The Touch Pro 2's fuel gauge IC is calibrated against the old cell's discharge curve — skipping this step causes erratic percentage readings from day one.

Sudden shutdown at 20–30% on the Touch Pro 2

This is a voltage cliff issue, not a capacity problem. The Touch Pro 2's modem and screen draw spike current simultaneously during a call or screen-on event, pulling cell voltage below the BMS cutoff threshold even when the fuel gauge still shows charge remaining. An aged or freshly installed cell with an uncalibrated fuel gauge IC makes this worse because the reported percentage doesn't match actual state of charge. Run one full discharge-charge cycle to let the coulomb counter align with the new cell's actual capacity curve. After calibration, the shutdown point should move below 10%.

Phone won't power on after the battery sat in storage

Li-ion cells that discharge below approximately 2.5V per cell trigger a BMS lockout to prevent damage from deep discharge. The Touch Pro 2 shows nothing on screen in this state — it looks completely dead. Connect the phone to a wall charger, not a PC USB port, and leave it for at least 20–30 minutes without pressing the power button. The charge IC needs to trickle current into the cell to bring it above the BMS re-enable threshold, typically around 3.0V, before normal charging or boot can begin.

Compatible Models

Touch Pro 2 Touch Pro II T7373 RHOD100

Replaces Part Numbers

BA S390 RHOD160 35H00123-00M 35H00123-02M

Technical Specifications

Voltage3.7V
Amp Hours2800mAh
Capacity2800mAh
Rate10.36Wh
Net Weight64.2g /2.26 oz
Gross Weight89g /3.14 oz
Approximate Weight89g /3.14 oz
Dimension 64.68 x 43.73 x 9.57mm

Product Highlights

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

Frequently Asked Questions

My Touch Pro 2 shows 25% battery and then shuts off instantly — is the new cell faulty?

The cell is most likely fine. This is a voltage cliff: the modem and display draw a current spike the cell cannot sustain at low state of charge, so voltage collapses below BMS cutoff before the fuel gauge reaches 0%. The fuel gauge IC on the Touch Pro 2 is still calibrated to the old cell's discharge curve after a swap, which makes the reported percentage unreliable. Run one complete discharge to auto-shutdown followed by a full uninterrupted charge — after that cycle, the coulomb counter recalibrates and the cutoff point drops to around 5–8%.

The battery percentage jumps around erratically after I installed the replacement — 60% one minute, 45% the next.

The Touch Pro 2's fuel gauge IC stores a discharge model based on the previous cell it monitored. A new cell with different internal impedance throws off that model immediately. This isn't a fault in the replacement cell — it's the coulomb counter recalibrating mid-use. Complete one full discharge cycle down to automatic shutdown, then charge to 100% without interruption. After that single cycle the percentage readings stabilise as the IC locks onto the new cell's actual discharge curve.

The phone gets noticeably warm near the battery slot during the first few charges — is that normal?

Yes, and it's specific to the first few cycles on a new cell. A fresh high-impedance Li-ion cell causes the charge IC to work harder to push current in, generating more heat than it would with a broken-in cell. The warmth should reduce noticeably after two or three full charge cycles as internal resistance drops. If the phone is still warm to the touch after five cycles, check that you're using the original HTC charger — third-party chargers can deliver unregulated current that keeps the charge IC running outside its efficient range.

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