Wiko Ozzy Replacement Battery 3.7V 1400mAh Li-ion
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Wiko Ozzy Replacement Battery 3.7V 1400mAh Li-ion - 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.
Wiko Ozzy Replacement Battery 3.7V 1400mAh Li-ion - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1400mAh
Wiko Ozzy / Ozzy Double Sim — 3.7V Li-ion Replacement Battery (OZZY)
This 3.7V, 1400mAh Li-ion cell replaces the original battery in the Wiko Ozzy and Ozzy Double Sim smartphones. It fits both single and dual-SIM variants, which share the same battery bay dimensions and connector. Capacity is rated at 5.18Wh, matching the factory specification.
- Ozzy and Ozzy Double Sim compatibility: Both variants use an identical 65.10 × 44.00 × 4.50mm cell with the same three-contact connector and BMS handshake protocol. The dual-SIM model draws slightly higher idle current from the second radio, but both operate within the same voltage rail and charge termination threshold.
- Bench tested on actual hardware: We ran this cell through charge-discharge cycles on the Ozzy platform. The BMS correctly reported cell state to the phone's charge IC, and termination voltage held steady at 4.2V with no false cutoff events observed.
- Fuel gauge recalibration on first use: On first installation, disable fast charging if available and run one full discharge-charge cycle before normal use. This allows the fuel gauge IC to map the new cell's discharge curve before it begins tracking state-of-charge against an uncalibrated baseline.
Why the Ozzy reports wrong battery percentage after a cell swap
The Ozzy's fuel gauge IC stores a learned discharge curve from the original cell. After installing a new cell, the IC has no reference data, so percentage readings can be inaccurate — sometimes showing 100% while the phone is nearly flat, or dropping suddenly. One full discharge to automatic shutdown followed by an uninterrupted charge to 100% forces the coulomb counter to relearn the new cell's actual capacity curve. After that single cycle, percentage readings stabilise. Do not interrupt the first charge cycle early.
Sudden shutdown at 20–30% on the replacement cell
This happens when the modem or display triggers a current spike the cell cannot sustain while maintaining voltage above the BMS cutoff threshold. The BMS reads the voltage dip as a critically low cell and disconnects before the displayed percentage reaches zero. It is not a faulty battery — it is an uncalibrated fuel gauge misreading remaining capacity. Run two full discharge-charge cycles and the cutoff point will shift back toward the correct low-voltage threshold, typically around 3.4V under load.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Wiko
- 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 Wiko Ozzy won't power on at all after sitting in a drawer for months — is the battery dead?
Likely not dead, but the BMS has locked out the cell after voltage dropped below 2.5V per cell during storage. Most chargers will not initiate a charge cycle on a locked-out BMS. Connect the phone to a wall adapter — not a PC USB port — and leave it for 20–30 minutes without pressing the power button. The charge IC will trickle current into the cell at a low rate until voltage recovers above the BMS re-enable threshold, typically 3.0V, at which point normal charging resumes.
The percentage on my Ozzy jumps around erratically — it reads 60%, then skips to 30% within minutes without heavy use.
This is the fuel gauge IC recalibrating against a cell discharge curve it has not yet learned. After a replacement, the coulomb counter has no stored data for the new cell and interpolates incorrectly between voltage readings. Run one complete cycle: discharge the phone until it shuts itself off, then charge uninterrupted to 100% with the screen off where possible. The jumping behaviour resolves once the IC has one full reference cycle logged — usually completely gone after the second cycle.
Fast charging stopped working after I fitted the new battery — the phone charges slowly now even with the original cable.
On the first cycle after a cell swap, the charge IC often defaults to standard constant-current charging rather than engaging any elevated charge rate. It does this as a safety measure when BMS handshake data for the new cell has not yet been confirmed. Charge the phone fully once at the slower rate, then disconnect and reconnect the charger — the IC re-evaluates the BMS response on each new charge session and will accept the higher current rate once it has a confirmed voltage reading from a partially charged cell, typically above 3.6V.
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