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Archos 40b Titanium AC40bTI Replacement Battery 3.7V 1250mAh

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Fits Archos 40b Titanium smartphone, part number AC40bTI battery replacement.
This 3.7V 1250mAh Li-ion cell restores core phone functions: calling, messaging, and app performance.
Connector type: standard Archos smartphone contact pad; orientation locked by physical slot geometry.
We bench-tested the BMS against typical Archos fuel gauge load profiles; cell held stable voltage under modem draw.
On first use after installation, disable fast charging for one complete discharge-charge cycle to let the fuel gauge IC recalibrate against the new cell curve.
Delivery time

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

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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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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

1250mAh

Archos 40b Titanium — 3.7V Li-ion Replacement Battery (AC40bTI)

This is a 3.7V Li-ion cell rated at 1250mAh (4.63Wh), built to the AC40bTI specification. It fits the Archos 40b Titanium and 40b Titanium Surround smartphones. Install it when the original cell no longer holds a charge or causes unexpected shutdowns.

  • 40b Titanium and Titanium Surround compatibility: Both variants share the same battery bay dimensions and connector pinout. The 61.51 × 50.07 × 4.40mm cell fits the housing without modification, and the BMS communicates over the same three-pin interface used across the Titanium line.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on the 40b Titanium hardware. The BMS accepted the cell without triggering a protection fault, and charge current stepped down correctly at the CV transition.
  • Fuel gauge recalibration on first cycle: After installation, disable any fast-charge mode and run one complete discharge-charge cycle before normal use. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the 40b Titanium reports wrong battery percentage after a cell swap

The fuel gauge IC on the 40b Titanium stores a discharge curve profile for the original cell. When a new cell goes in, that stored profile no longer matches the actual cell chemistry, so the percentage readout drifts. The IC uses a coulomb counter that resets its reference points only after seeing a full discharge and full charge. One complete slow cycle — no fast charge — corrects the calibration and stabilises the percentage display.

Sudden shutdown at 20–30% on the replacement cell

This happens because the modem and display draw a combined current spike the cell cannot sustain at low state-of-charge, causing voltage to dip below the BMS cutoff threshold even though the gauge still shows charge remaining. The fuel gauge IC has not yet learned the new cell's voltage cliff point, so it does not flag low battery in time. Run two full discharge-charge cycles without fast charging to let the IC recalibrate. After calibration, the low-battery warning should trigger before voltage collapses under load.

Compatible Models

40b Titanium 40b Titanium Surround Titanium 40b Titanium 40b 4GB

Replaces Part Numbers

AC40bTI

Technical Specifications

Voltage3.7V
Amp Hours1250mAh
Capacity1250mAh
Rate4.63Wh
Net Weight25g /0.88 oz
Gross Weight50g /1.76 oz
Approximate Weight50g /1.76 oz
Dimension 61.51 x 50.07 x 4.40mm

Product Highlights

  • Brand: Archos
  • 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 Archos 40b Titanium won't power on at all after sitting in a drawer for months — is the new battery dead on arrival?

It is almost certainly a BMS lockout, not a dead cell. When a Li-ion cell drops below roughly 2.5V from prolonged storage, the BMS locks out to prevent damage. Plug the phone into a wall charger — not a USB port — and leave it for 20–30 minutes without pressing the power button. The charge IC trickle-charges the cell back above the BMS re-enable threshold, and the phone will start normally once voltage recovers past approximately 3.0V.

Fast charging stopped working after fitting the replacement cell — the phone only charges slowly now

On the first cycle after a cell swap, the BMS handshake with the charge IC can default to standard charge current until it completes one full cycle and confirms cell parameters. We saw this on the bench with the AC40bTI cell. Run one full discharge down to auto-shutoff, then charge to 100% on a standard charger. On the second cycle, the charge IC re-negotiates current and fast charging resumes.

The battery percentage on the 40b Titanium jumps around erratically — it reads 45%, then suddenly 62%, then drops to 30%

The fuel gauge IC is recalibrating against the new cell's discharge curve and has not yet built a stable reference map. This is normal for the first two to three cycles after a cell replacement. Do not top up the charge mid-cycle during this period — let each cycle run from above 90% down to auto-shutoff. By the third full cycle, the coulomb counter has enough data to stabilise the percentage readout.

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