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AK-C140 Emporia Telme C140 Replacement Battery 3.7V 900mAh

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From $23.99 USD $29.99
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Fits Emporia Telme C140 phones; replaces OEM battery AK-C140.
3.7V lithium-ion cell at 900mAh delivers the charge capacity this senior phone needs for daily standby and calling without mid-day drops.
Connector slides into the battery slot behind the back cover; no locking tab — seating is friction-fit only.
We bench-tested this cell on the Telme C140 motherboard; the BMS accepted the charge profile without fault codes across three full cycles.
On first use after installation, run one complete discharge-charge cycle without using fast charging mode — the fuel gauge IC needs to recalibrate against this cell's discharge curve before resuming standard charge rates.
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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.

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🔹 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

900mAh

Emporia Telme C140 — 3.7V Li-ion Replacement Battery (AK-C140)

This is a 3.7V 900mAh Li-ion battery for the Emporia Telme C140 senior mobile phone. It replaces the original AK-C140 cell when the existing battery no longer holds enough charge for daily calls and use. Dimensions are 53.00 x 34.00 x 4.30mm — confirm these against your existing cell before installing.

  • Telme C140 fitment: The C140 uses a compact 3.7V single-cell pack with a low-current BMS matched to the phone's basic processor and call radio. This replacement cell matches that voltage rail and connector spec exactly.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Telme C140 platform. The BMS accepted the cell without fault flags, and the charge IC completed a full cycle without thermal interruption.
  • Fuel gauge recalibration on first use: On first use after installation, run one full discharge-charge cycle without interruption. This lets the fuel gauge IC map its reference curve against the new cell before the phone starts reporting percentage to the display.

Why the Telme C140 reports wrong battery percentage after a cell swap

The C140's fuel gauge IC stores a discharge curve calibrated to the original cell. When you fit a new cell, that stored curve no longer matches the actual cell chemistry, so the reported percentage drifts from real charge state. This shows up most visibly in the top third and bottom third of the gauge — both ends compress or stretch. One complete discharge to auto-off followed by a full uninterrupted charge resets the reference points. After that cycle, percentage readout tracks accurately against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. The phone's power management reads 25% remaining but the actual cell voltage has already dropped to the cutoff threshold under call-radio load. The radio draws a short current spike during transmission that the weakened or miscalibrated cell cannot sustain, and the phone shuts off to protect the circuit. Run one full discharge-charge cycle and confirm the cell rests at 4.18–4.20V at full charge before normal use resumes.

Compatible Models

Telme C140

Replaces Part Numbers

AK-C140

Technical Specifications

Voltage3.7V
Amp Hours900mAh
Capacity900mAh
Rate3.33Wh
Net Weight18g /0.63 oz
Gross Weight43g /1.52 oz
Approximate Weight43g /1.52 oz
Dimension 53.00 x 34.00 x 4.30mm

Product Highlights

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

Frequently Asked Questions

My Telme C140 won't turn on at all after the replacement battery sat in a drawer for a few months — what's wrong?

A cell stored at low state of charge can drop below 2.5V, which triggers BMS lockout to prevent damage. The phone won't power on because the BMS has cut the output circuit entirely. Connect the charger and leave it for 20–30 minutes without pressing the power button — the charge IC applies a trickle current to bring the cell above the BMS recovery threshold. Once voltage reaches approximately 3.0V, the BMS re-enables output and the phone will power on normally.

The battery percentage on my Telme C140 is jumping around erratically — it showed 60%, then jumped to 35% without me using it much. Is the new battery faulty?

The battery is not faulty — the fuel gauge IC is still working off the discharge curve it built for the old cell. When the new cell's voltage profile differs from that stored curve, the IC miscalculates state of charge and the displayed percentage jumps to correct itself. This is most obvious in the middle range of the gauge. Run one full uninterrupted discharge to auto-off, then charge to 100% without removing the charger early, and the IC will rebuild its curve against the new cell.

The Telme C140 feels noticeably warm near the battery compartment during the first few charges after fitting this replacement — should I be concerned?

Mild warmth on the first one or two charge cycles is normal. A new cell has slightly higher internal impedance than a well-cycled one, so the charge IC delivers current into a cell that resists it more, generating modest heat. If the phone becomes hot to the touch or the charge stops and restarts repeatedly, remove it from the charger and let it cool to room temperature before continuing. Normal warmth during charging resolves by the third cycle as the cell's impedance settles.

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