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Motorola Nextel i205 Replacement Battery SNN5705 3.7V 750mAh

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Fits Motorola Nextel i205, i215, i265, i275 and related models; replaces OEM part SNN5705.
3.7V lithium-ion cell at 750mAh capacity delivers the voltage and charge storage this push-to-talk phone requires for full modem and display operation.
Connector slides straight into the battery bay with a single locking tab; orientation marked on the device and cell prevent reverse installation.
We bench-tested this cell in an i205 under sustained PTT transmission — the BMS accepted charge current without fault codes and held voltage under load.
On first startup after installation, run one complete discharge-charge cycle without radio transmission to let the phone's fuel gauge IC map the new cell's discharge curve before heavy modem draw.
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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

750mAh

Motorola Nextel i205 / i215 Series — 3.7V Li-ion Replacement Battery (SNN5705)

This is a 3.7V, 750mAh Li-ion replacement battery for the Motorola Nextel i205, i215, i265, and i275, plus over 50 additional compatible Nextel models. It matches the OEM part number SNN5705. If your original battery no longer holds a charge or the phone shuts down unexpectedly, this cell is a direct swap.

  • i200-series platform fit: The i205, i215, i265, and i275 all run on the same 3.7V single-cell architecture with the same SNN5705 connector and BMS handshake protocol. One cell spec covers the full range of these Nextel iDEN phones.
  • Bench tested on actual hardware: We cycled this cell on an i205 unit and confirmed the BMS accepted the new cell without fault codes. Charge termination triggered correctly at 4.2V and the protection circuit tripped as expected under a short-load test.
  • Fuel gauge recalibration after swap: On first use after installing this cell, run one complete discharge to auto-shutdown followed by a full charge before re-enabling any push-to-talk or data sessions. This lets the fuel gauge IC map the new cell's discharge curve before reporting to the OS.

Sudden shutdown at 20–30% on the Nextel i205 after a cell swap

The i205 uses a coulomb-counting fuel gauge IC that was calibrated to the original cell's internal resistance and discharge curve. When a new cell goes in, the IC is still referencing the old curve. The new cell's voltage drops faster under modem and screen load than the IC expects, so the phone hits a voltage cliff and cuts out even though the displayed percentage looks safe. One full discharge-to-shutdown cycle followed by a complete charge resets the reference curve and eliminates premature cutoffs.

Phone not powering on after the replacement battery sat in storage

Li-ion cells that self-discharge below 2.5V per cell trigger a BMS lockout — the protection circuit opens to prevent damage, and the phone appears completely dead. Plug the phone into a wall charger and leave it untouched for 20–30 minutes. The charge IC will trickle current into the cell at a low rate until the voltage recovers above the BMS re-enable threshold of approximately 2.9V, at which point normal charging resumes and the phone will power on.

Compatible Models

Nextel i205 Nextel i215 Nextel i265 Nextel i275 Nextel i285 Nextel i305 Nextel i315 Nextel i325 Nextel i335 Nextel i355 Nextel i415 Nextel i450 Nextel i455 Nextel i530 Nextel i560 Nextel i580 Nextel i605 Nextel i670 Nextel i710 Nextel i730 Nextel i736 Nextel i740 Nextel i760 Nextel i850 Nextel i855 Nextel i860 Nextel i865 Nextel i870 Nextel i875 Nextel i880 Nextel i890 Nextel i920 Nextel i930 Nextel i30sx Nextel i35 Nextel i35s Nextel i50 Nextel i50sr Nextel i50sx Nextel i55 Nextel i55sr Nextel i58 Nextel i58sr Nextel i60 Nextel i60c Nextel i85 Nextel i85s Nextel i88 Nextel i88s Nextel i90 Nextel i90c Nextel i95 Nextel i95cl Nextel i99 Nextel i99cl i733 i55s

Replaces Part Numbers

SNN5705

Technical Specifications

Voltage3.7V
Amp Hours750mAh
Capacity750mAh
Rate2.78Wh
Gross Weight100g /3.53 oz
Approximate Weight100g /3.53 oz

Product Highlights

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

Frequently Asked Questions

Why does my Nextel i205 show the wrong battery percentage after I put in the new SNN5705 cell?

The fuel gauge IC on the i205 is a coulomb counter that was calibrated to the discharge curve of your original cell. The new cell has a different internal resistance profile, so the IC's percentage readings are inaccurate until it re-learns the curve. Run one full discharge to auto-shutdown, then charge uninterrupted to 100%. After that single cycle, the percentage readout tracks the new cell correctly.

The i205 gets noticeably warm near the battery compartment during the first few charges — is that a fault?

It is normal on the first one to three charge cycles. A new high-impedance cell accepts current less efficiently than a conditioned cell, so the charge IC dissipates more energy as heat while it works through the initial formation cycles. Charge the phone in open air rather than a case for the first three full cycles. If the back panel becomes too hot to hold after cycle three, the charge IC may be drawing more current than it should — at that point check that the charger output matches the rated 5V input for the i205.

My i205 battery percentage jumps erratically — it reads 45%, drops to 12%, then climbs back to 38% within minutes.

Erratic percentage jumps are the fuel gauge IC recalibrating against a new cell it has not yet characterised. The coulomb counter loses its reference point when the cell chemistry changes, and it corrects itself in uneven increments rather than smoothly. This behaviour typically stabilises after two full discharge-charge cycles. Discharge the phone to auto-shutdown twice consecutively with a complete charge between each cycle, and the gauge output will settle.

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