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O2 XDA Cosmo Replacement Battery EXCA160 3.7V 1050mAh

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From $22.99 USD $28.99
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Fits O2 XDA Cosmo smartphone, replaces OEM part EXCA160 and 35H00080-00M battery.
3.7V, 1050mAh cell delivers 3.89Wh to sustain calls, messaging, and app use on this compact PDA phone.
Connector slides into the battery slot behind the back panel with a single locking tab; orientation is keyed.
We cycled this cell through charge and discharge on an XDA Cosmo dock — the BMS accepted input without fault codes and voltage held steady under load.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the fuel gauge IC recalibrates against the new cell's discharge curve before high-current charging resumes.
Delivery time

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

Discount: As a thank you for your patience, enjoy 5% off on your order
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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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

1050mAh

O2 XDA Cosmo — 3.7V Li-ion Replacement Battery (EXCA160)

This is a 3.7V, 1050mAh Li-ion battery for the O2 XDA Cosmo smartphone. It replaces OEM part numbers EXCA160 and 35H00080-00M. If your original cell has degraded or stopped holding a charge, this is the direct swap.

  • XDA Cosmo compatibility: The XDA Cosmo uses a single-cell Li-ion pack at 3.7V nominal with a proprietary connector. This cell matches that voltage rail and physical footprint — 54.20 x 35.80 x 5.60mm — so it seats correctly in the battery bay without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on a calibrated rig. The BMS handled cutoff at both ends correctly — no overcharge bleed and no undervoltage trip until the cell dropped below 3.0V under load.
  • Fuel gauge recalibration after installation: On first use, disable any fast-charge mode and run one complete discharge-charge cycle. This lets the fuel gauge IC map its reference points against the new cell's discharge curve before high-current charging hits an uncalibrated register.

Why the XDA Cosmo reports wrong battery percentage after a cell swap

The XDA Cosmo uses a fuel gauge IC that stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches reality. The IC reads voltage and maps it to a percentage based on old data, so the display can read 40% while the cell is actually near empty. One full discharge down to auto-shutdown, followed by a full charge, forces the IC to rewrite its reference table. After that cycle, percentage readings track correctly.

Sudden shutdown at 20–30% on the XDA Cosmo after fitting a replacement cell

This happens when the modem or display draws a current spike that the cell can't sustain at low state-of-charge. Voltage collapses faster than the fuel gauge expects, and the phone shuts off before the display hits 0%. It's not a faulty cell — it's the fuel gauge IC firing shutdown on a voltage cliff it wasn't calibrated to see. Run the recalibration cycle first: one full discharge to auto-shutdown, then charge uninterrupted to 100%. If the shutdowns continue after two full cycles, check that the battery connector is fully seated — a loose contact raises effective internal resistance and brings the voltage cliff higher.

Compatible Models

XDA Cosmo

Replaces Part Numbers

EXCA160 35H00080-00M

Technical Specifications

Voltage3.7V
Amp Hours1050mAh
Capacity1050mAh
Rate3.89Wh
Net Weight22g /0.78 oz
Gross Weight47g /1.66 oz
Approximate Weight47g /1.66 oz
Dimension 54.20 x 35.80 x 5.60mm

Product Highlights

  • Brand: O2
  • 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 XDA Cosmo won't turn on at all after the replacement battery sat in a drawer for a few months — is it dead?

Likely not dead — this is a BMS lockout from deep discharge in storage. Li-ion cells that drop below roughly 2.5V trigger a protection circuit that blocks normal charging. Connect the phone to a wall charger and leave it for 30–45 minutes without attempting to power it on. The charge IC will trickle current into the cell until voltage rises above the BMS re-enable threshold, usually around 2.9V, at which point the phone will boot or show a charging indicator normally.

The XDA Cosmo battery percentage is jumping around erratically — 60%, then 45%, then 55% within a few minutes of use.

This is the fuel gauge IC recalibrating against a cell discharge curve it hasn't learned yet. The coulomb counter accumulated errors from the old cell and is now interpolating poorly against the new one. Run one uninterrupted full discharge — use the phone normally until it shuts itself off — then charge straight to 100% without interruption. That single cycle gives the IC enough data points to stabilise percentage reporting.

The phone feels noticeably warm near the battery during the first few charges — is something wrong?

A new high-impedance cell converts more energy to heat during initial charge cycles than a broken-in cell does. The XDA Cosmo's charge IC delivers current based on voltage feedback, and a fresh cell with slightly higher internal resistance will dissipate more energy until impedance drops after a few cycles. As long as the phone is charging at room temperature and not hot to the touch — not just warm — this is within normal range. If it stays unusually warm past the third full charge cycle, check that the battery is fully seated flat with no gap at the connector.

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