Mobistel Cynus T1 BTY26179 Replacement Battery 3.7V 1980mAh
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Mobistel Cynus T1 BTY26179 Replacement Battery 3.7V 1980mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Mobistel Cynus T1 BTY26179 Replacement Battery 3.7V 1980mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1980mAh
Mobistel Cynus T1 — 3.7V Li-ion Replacement Battery (BTY26179)
This is a 3.7V, 1980mAh Li-ion replacement battery for the Mobistel Cynus T1 smartphone. It replaces OEM part BTY26179 and fits the Cynus T1 directly. Use this when the original cell has degraded, won't hold charge, or has failed outright.
- Cynus T1 fitment: The Cynus T1 uses a removable 3.7V single-cell Li-ion pack with a fixed connector pinout and BMS handshake matched to the phone's charge IC. This replacement matches that connector, cell voltage, and BMS communication so the device recognises the pack on first boot.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, monitoring BMS cutoff at the low end and charge termination at 4.2V. The protection circuit triggered correctly at both ends with no false trips under steady load.
- Fuel gauge recalibration on first use: On first installation, disable fast charging and run one full discharge-charge cycle before normal use. This lets the Cynus T1's fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.
Sudden shutdown at 20–30% on the Cynus T1 after a cell swap
This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell hits a voltage cliff under modem or display load that the gauge didn't predict, so the phone shuts down before the reported percentage reaches zero. It is not a defective battery. Run one full discharge to automatic shutdown, then charge uninterrupted to 100% — the fuel gauge IC recalibrates against the new cell during that cycle and the premature cutoff stops.
Phone won't power on after the BTY26179 sat in storage
Li-ion cells in storage self-discharge slowly. If the cell drops below approximately 2.5V, the BMS enters lockout to prevent damage to the cell chemistry. The Cynus T1 will show nothing on screen — no charging animation, no boot logo. Connect the phone to a wall charger rated at 5V/1A and leave it for 20–30 minutes without pressing any buttons. Once the BMS sees enough voltage to exit lockout, the charging indicator will appear and the phone will boot normally.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Mobistel
- 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
The Cynus T1 shows 25% battery and then just dies — is the BTY26179 faulty?
It is not a faulty cell. The phone's fuel gauge IC calibrated its discharge curve against the old worn cell and doesn't match the new one. The new cell hits a voltage drop under screen or modem load before the gauge expects it, triggering an emergency shutdown. Run one uninterrupted full discharge down to automatic shutdown, then charge straight to 100% — that single cycle recalibrates the coulomb counter and the early shutdowns stop.
The Cynus T1 feels warm near the battery compartment while charging the new cell — is that normal?
A fresh Li-ion cell typically has higher internal impedance than a broken-in cell, so the charge IC pushes slightly more voltage across that resistance on the first few cycles. This produces mild warmth during the constant-current charge phase. It settles after three to five full cycles as the cell's impedance drops. If the phone becomes hot to the touch or the back panel distorts, remove it from charge immediately and check the charger output voltage stays at 5V.
Fast charging stopped working after I installed the replacement BTY26179 — what changed?
The Cynus T1's charge IC runs a handshake with the battery BMS before allowing elevated charge current. On the first cycle with a new cell, the IC sometimes defaults to standard 5V/1A current until it completes one full charge-discharge cycle and confirms the BMS responses are consistent. Charge the phone completely to 100% at standard rate, discharge it fully, then charge again — fast charging typically resumes from the second cycle onward once the IC has logged a clean cycle from the new cell.
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