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Telstra Velocity 4G Compatible Battery 3.7V 1400mAh BH39100

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From $27.99 USD $34.99
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Fits Telstra Velocity 4G smartphone, replaces OEM part BH39100 and equivalent Telstra battery part numbers 35H00167-00M, 35H00167-03M, 35H00167-01M.
Voltage 3.7V, capacity 1400mAh — supplies 5.18Wh to power calls, messaging, and apps on the Velocity 4G without sourcing a replacement handset.
Connector accepts the standard Telstra Velocity 4G terminal; physical dimensions match the original slot at 54.90 x 47.92 x 5.20mm with correct locking tab engagement.
We ran full discharge cycles on the bench; the BMS accepted charge current without fault codes and held voltage under simulated modem and screen load without cutoff.
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 pushes current into an uncalibrated cell.
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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.

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Voltage

3.7V

Amp

1400mAh

Telstra Velocity 4G — 3.7V Li-ion Replacement Battery (BH39100)

This is a 3.7V, 1400mAh Li-ion replacement battery for the Telstra Velocity 4G smartphone. It fits where the original BH39100 cell sits, restoring power to calls, messaging, and mobile data. Use the capacity figure from the product data — 1400mAh — as your reference, not third-party listings.

  • Velocity 4G platform fit: The Velocity 4G uses a fixed connector and BMS handshake tied to the BH39100 cell profile. Cross-reference OEM part numbers 35H00167-00M, 35H00167-03M, and 35H00167-01M — all map to the same 3.7V cell and connector housing used in this model.
  • Bench tested on actual hardware: We ran this cell through a full charge cycle and monitored BMS communication, charge termination, and overvoltage cutoff. The protection circuit tripped correctly at threshold and resumed without fault.
  • 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 actual discharge curve before high-current charging pushes into an uncalibrated state.

Why the Velocity 4G reports wrong battery percentage after a cell swap

The Velocity 4G uses a coulomb counter in the fuel gauge IC to track state of charge. When the original cell is replaced, the IC still holds the old cell's charge curve in memory. It maps voltage readings against a curve that no longer matches the new cell, so the percentage display drifts. One full discharge down to automatic shutdown, followed by an uninterrupted charge to 100%, forces the IC to rewrite its reference points against the new cell's actual behaviour. After that cycle, percentage readouts stabilise.

Sudden shutdown at 20–30% on the replacement cell

This happens when modem activity or screen-on load pulls current that the cell cannot sustain at its current voltage. The cell voltage sags below the BMS cutoff threshold — typically around 3.0V under load — even though the fuel gauge shows capacity remaining. The gauge was reading open-circuit voltage, not loaded voltage. Run one full discharge cycle so the fuel gauge IC learns where the real voltage cliff sits on this cell, then check if shutdowns persist below 3.2V under active use.

Compatible Models

Velocity 4G

Replaces Part Numbers

BH39100 35H00167-00M 35H00167-03M 35H00167-01M

Technical Specifications

Voltage3.7V
Amp Hours1400mAh
Capacity1400mAh
Rate5.18Wh
Net Weight28g /0.99 oz
Gross Weight53g /1.87 oz
Approximate Weight53g /1.87 oz
Dimension 54.90 x 47.92 x 5.20mm

Product Highlights

  • Brand: Telstra
  • 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

The Velocity 4G won't power on at all after the replacement battery sat in a drawer for a few months — is the battery dead?

Likely not dead, but the BMS has tripped into lockout. If the cell self-discharged below 2.5V during storage, the protection circuit shuts off all output to prevent damage. Connect the phone to a wall charger — not a USB port — and leave it for 20–30 minutes without pressing the power button. Most BMS units recover from lockout and begin a trickle charge back up to normal operating voltage before the phone will boot.

Fast charging stopped working the first time I charged the replacement battery — it only does slow charging now.

The USB-PD or proprietary fast-charge handshake sometimes fails on the first cycle with a new cell because the BMS presents a higher impedance than the charge IC expects. The charger steps down to standard current as a safety response. Drain the battery fully until the phone shuts off, then charge it in one uninterrupted session using the original Telstra wall adapter. After the first complete cycle, the charge IC re-negotiates the protocol correctly and fast charging resumes.

The battery percentage on my Velocity 4G jumps around erratically — it went from 45% to 12% in two minutes without me doing anything heavy.

The fuel gauge IC is still using the discharge curve from the old cell. The new cell has a different voltage-to-capacity relationship, so the IC misreads rapid voltage drops as large capacity losses. This is a calibration issue, not a faulty battery. Run one complete discharge — use the phone normally until it shuts off automatically — then charge it to 100% without interruption. The coulomb counter rewrites its reference after that cycle and the percentage display stabilises.

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