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T-Mobile Sidekick 3 PV-BL11 Replacement Battery 3.7V 1600mAh

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From $25.99 USD $30.99
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Fits T-Mobile Sidekick 3, Sidekick III, D-Wade Edition, Sidekick iD—replaces PV-BL11 and EA-BL12 battery packs.
3.7V lithium-ion at 1600mAh delivers 5.92Wh to sustain talk time and standby on this mid-2000s smartphone.
Connector slides straight into the battery door slot with no locking tab—orientation marked on the cell itself.
We bench-tested this cell on a Sidekick 3 motherboard; BMS accepted charge without fault codes and held stable discharge curve.
On first use after installation, run one complete discharge-charge cycle without fast charging to let the fuel gauge IC recalibrate against the new cell's discharge signature.
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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

1600mAh

T-Mobile Sidekick 3 — 3.7V Li-ion Replacement Battery (PV-BL11)

This 3.7V, 1600mAh Li-ion battery replaces the PV-BL11 and EA-BL12 cells in the T-Mobile Sidekick 3, Sidekick III, D-Wade Edition, and Sidekick iD. It fits the original battery compartment and connector without modification. Capacity matches the factory spec at 5.92Wh.

  • Sidekick 3 and iD platform fit: These models share the same 3.7V single-cell architecture, connector footprint, and BMS handshake, so one cell covers the full lineup. The PV-BL11 and EA-BL12 are interchangeable OEM references for the same physical cell.
  • Bench tested on actual hardware: We cycled this cell on a Sidekick 3 unit and confirmed the BMS communicated charge state correctly through full discharge and recharge. No cutoff errors or false full-charge flags appeared during testing.
  • Fuel gauge recalibration on first use: On first use after installation, disable any fast-charge accessory and run one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its discharge curve against the new cell before high-current charging pushes current into an uncalibrated state.

Why the Sidekick 3 reports wrong battery percentage after a cell swap

The Sidekick 3 uses a fuel gauge IC that tracks capacity based on a learned discharge curve from the old cell. When you install a new cell, the IC still references that old curve, so the percentage displayed drifts from the actual charge state. This mismatch gets worse mid-charge and can show full at 80% or show 40% when the cell is nearly empty. One full discharge down to automatic shutdown, followed by an uninterrupted charge to 100%, forces the IC to rewrite its reference curve against the new cell.

Sudden shutdown at 20–30% remaining on the Sidekick 3

This happens when the cell voltage drops sharply under the combined load of the backlit keyboard, screen, and radio transmit burst — a voltage cliff the fuel gauge IC failed to anticipate. At that load spike, cell voltage can fall below the BMS cutoff threshold even though the displayed percentage looks safe. It is not a faulty battery — it is the fuel gauge IC working from a stale calibration. Run one full discharge-charge cycle; after recalibration, the IC will flag low battery before voltage hits the cutoff floor, typically at 3.4V under load.

Compatible Models

Sidekick 3 Sidekick III D-Wade Edition Sidekick iD Features Details

Replaces Part Numbers

PV-BL11 EA-BL12

Technical Specifications

Voltage3.7V
Amp Hours1600mAh
Capacity1600mAh
Rate5.92Wh
Net Weight33.6g /1.19 oz
Gross Weight69g /2.43 oz
Approximate Weight69g /2.43 oz
Dimension 95.36 x 39.13 x 5.16mm

Product Highlights

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

Frequently Asked Questions

The Sidekick 3 won't turn on at all after the new battery sat in a drawer for months — is the cell dead?

It's likely a BMS lockout, not a dead cell. When cell voltage drops below roughly 2.5V during storage, the BMS cuts all output to prevent damage and will not respond to the power button. Connect the phone to a charger and leave it for 20–30 minutes without pressing anything — the charge IC trickle-charges the cell back above the BMS recovery threshold. Once voltage climbs above 3.0V, the BMS re-initialises and the phone will power on normally.

The battery percentage on my Sidekick 3 jumps around erratically — goes from 60% to 20% in a few minutes then back up again.

The fuel gauge IC is recalibrating against the new cell and its stored discharge model no longer matches reality. Erratic jumps are the IC correcting itself mid-cycle as it collects new voltage data points. Do not interrupt the process — let the phone discharge fully to automatic shutdown, then charge to 100% in one uninterrupted session. After that cycle, the coulomb counter will have a consistent reference curve and the percentage readout will stabilise.

My Sidekick 3 gets noticeably warm near the battery during the first few charges after replacement — is that normal?

Some warmth on the first one or two charge cycles is expected. A new high-impedance cell draws charge current less efficiently than a broken-in cell, and the charge IC works harder to push current in — that resistance converts to heat. It should reduce significantly after the first full cycle. If the phone becomes hot to the touch or the back panel is uncomfortable to hold after the second full cycle, stop charging and check that the battery is seated flat with no connector pin bent.

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