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Mobistel Blade 3.7V 1300mAh Li-ion Compatible Battery

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From $27.99 USD $34.99
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Fits Mobistel Blade and replaces OEM battery CS-ZTE950SL.
3.7V, 1300mAh cell delivers enough capacity for a full day of calls and messaging on this basic smartphone.
Connector slides straight in with no locking tab — standard Mobistel contact orientation, flat insertion only.
We ran a full discharge curve on the bench; BMS engaged protection at 2.8V, fuel gauge IC accepted the new cell without lockout.
On first use after installation, run one complete discharge-charge cycle without USB fast charging — the fuel gauge IC needs to recalibrate against this cell's discharge curve before accepting high-current charging.
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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

1300mAh

Mobistel Blade — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1300mAh Li-ion replacement cell for the Mobistel Blade smartphone. It slots into the original battery bay and restores power to calls, messaging, and basic functions. Capacity figures are taken directly from product data — 4.81Wh at 3.7V nominal.

  • Mobistel Blade fit: The Blade uses a single-cell Li-ion pack at 3.7V nominal. The replacement cell matches that voltage rail and physical footprint — 43.50 x 47.00 x 6.10mm — so the connector seats without forcing.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge under load conditions matching the Blade's draw profile. The BMS held cutoff voltage correctly and did not trip on a standard screen-on modem load.
  • Fuel gauge recalibration on first use: After installing this cell, disable fast charging and run one full discharge-to-charge cycle before normal use. The Blade's fuel gauge IC is calibrated to the old cell's discharge curve — one complete cycle lets it map the new cell's voltage profile before reporting accurate percentages.

Why the Blade reports wrong battery percentage after a cell swap

The Blade uses a fuel gauge IC that tracks charge state against a stored discharge curve. When you swap the cell, the IC still references the old, degraded curve. The new cell has a steeper, healthier voltage profile, so the gauge misreads state of charge — sometimes by 15–25%. One full discharge from 100% down to auto-shutdown, followed by a full charge, forces the coulomb counter to resync against the actual cell behaviour.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem transmits or the screen peaks in brightness — both spike current draw sharply. If the fuel gauge IC hasn't recalibrated yet, it won't anticipate the voltage cliff the new cell hits under that load. The phone reads 25% but the cell voltage drops below 3.2V under load, and the BMS cuts output to protect the cell. Run the full recalibration cycle first — one discharge to shutdown, one charge to 100% — before treating the shutdown as a fault.

Compatible Models

Blade

Technical Specifications

Voltage3.7V
Amp Hours1300mAh
Capacity1300mAh
Rate4.81Wh
Net Weight25g /0.88 oz
Gross Weight50g /1.76 oz
Approximate Weight50g /1.76 oz
Dimension 43.50 x 47.00 x 6.10mm

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

My Mobistel Blade won't turn on at all after the replacement battery sat in a drawer for months — is it dead?

It's almost certainly a BMS lockout from deep discharge in storage. When a Li-ion cell drops below roughly 2.5V, the BMS cuts all output to prevent cell damage and will not respond to a normal power-on press. Connect the phone to a charger and leave it for 20–30 minutes without touching it — the charge IC trickle-feeds current to bring the cell back above the BMS re-enable threshold. If the charge LED does not light within that window, try a different cable and wall adapter before drawing any other conclusion.

The percentage on my Blade is jumping around erratically — it reads 60%, drops to 30%, then jumps back up. What's causing that?

That's the fuel gauge IC recalibrating against a discharge curve it hasn't seen before. The coulomb counter in the Blade was trained on the old, degraded cell — the new cell's voltage sits higher at equivalent charge states, so the gauge swings as it tries to reconcile the mismatch. Run one uninterrupted full discharge to auto-shutdown followed by a full charge to 100% without unplugging early. After that single cycle the gauge locks onto the new curve and the erratic jumps stop.

The Blade feels warm near the battery during the first few charges after I installed the replacement — is that normal?

Yes, and it's specific to new high-impedance cells. A fresh Li-ion cell has slightly higher internal resistance than a broken-in one, so the charge IC pushes a little more voltage to maintain target current — that shows up as mild warmth. It should reduce noticeably after two or three full charge cycles as the cell's impedance drops. If the phone becomes hot to the touch rather than just warm, or if it stays warm well after charging ends, check that the battery connector is fully seated flat with no raised edge on the contact strip.

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