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GreatCall Jitterbug Smart 2 Replacement Battery 3.85V 3000mAh

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New arrival
From $26.99 USD $33.99
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Fits GreatCall Jitterbug Smart 2, OT5049S, and Smart A30 models exactly.
3.85V, 3000mAh Li-Polymer cell delivers full charge cycles to the modem and display.
Connector seats flush into the original battery slot with no modifications or adapters required.
We bench-tested the BMS against standby and call loads; voltage held steady under voice transmission.
On first use after installation, run one complete discharge-charge cycle with fast charging disabled to let the fuel gauge IC recalibrate against the new cell's discharge curve.
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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

3.85V

Amp

3000mAh

GreatCall Jitterbug Smart 2 / OT5049S — 3.85V Li-Polymer Replacement Battery

This 3.85V, 3000mAh Li-Polymer cell replaces the original battery in the GreatCall Jitterbug Smart 2, OT5049S, and Smart A30. It restores full power to the phone's calling, messaging, and basic smartphone functions. Capacity is rated at 11.55Wh and matches OEM specifications directly.

  • Jitterbug Smart 2 / OT5049S / Smart A30 compatibility: These three models share the same physical cell footprint at 76.90 x 62.26 x 3.40mm, the same 3.85V nominal voltage rail, and the same charge IC interface — which is why one cell covers all three variants without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the Jitterbug Smart 2 platform. The BMS accepted the cell without fault flags, and the charge IC negotiated correctly through a full cycle to termination.
  • First-cycle fuel gauge recalibration: After installation, disable fast charging for the first complete discharge-charge cycle. The fuel gauge IC is calibrated to the old cell's discharge curve. Running one full cycle at standard charge current lets the coulomb counter reset its reference before fast charge pushes higher current into an uncalibrated cell.

Why the Jitterbug Smart 2 reports wrong battery percentage after a cell swap

The phone's fuel gauge IC builds its percentage estimates from a stored discharge curve tied to the old cell's internal resistance profile. A new cell has a different impedance, so the IC maps voltage readings onto the wrong curve. This shows up as percentage jumps, slow drain from 100% followed by a sudden drop, or the phone dying while showing 15–20% remaining. One complete discharge to auto-shutdown followed by a full charge to 100% forces the coulomb counter to re-anchor its reference points to the new cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff failure, not a capacity issue. Under load from the cellular modem or a bright screen, the cell voltage drops sharply below the BMS cutoff threshold — even though the fuel gauge still reads 20–30%. It happens because the fuel gauge IC hasn't yet mapped the new cell's voltage-sag behaviour under load. Run two full discharge-charge cycles without fast charging to let the IC learn the cell's actual voltage floor. After calibration, the shutdown threshold should track accurately down to around 3.0–3.2V under load.

Compatible Models

Jitterbug Smart 2 OT5049S Smart A30

Technical Specifications

Voltage3.85V
Amp Hours3000mAh
Capacity3000mAh
Rate11.55Wh
Net Weight40.5g /1.43 oz
Gross Weight90.5g /3.19 oz
Approximate Weight90.5g /3.19 oz
Dimension 76.90 x 62.26 x 3.40mm

Product Highlights

  • Brand: GreatCall
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Jitterbug Smart 2 battery percentage jumps around erratically after I put in the new cell — is something wrong with it?

Nothing is wrong with the cell. The fuel gauge IC is still running on the discharge curve it learned from the old battery, so it misreads the new cell's voltage at every state of charge. Run one complete cycle — drain the phone to auto-shutdown, then charge uninterrupted to 100% — and the coulomb counter will recalibrate to the new cell's profile. Percentage readings stabilise after that first full cycle.

The phone won't turn on at all after sitting in a drawer for months with this battery installed — is it dead?

The BMS has likely triggered a deep-discharge lockout. When cell voltage drops below approximately 2.5V from prolonged storage, the protection circuit opens to prevent cell damage and the phone won't respond to a normal power press. Plug into a wall charger — not a computer USB port — and leave it connected for at least 30 minutes without attempting to power on. The charge IC will trickle current into the cell until voltage recovers above the BMS re-enable threshold, at which point the phone will boot normally.

Fast charging stopped working on my Jitterbug Smart 2 the first time I charged the replacement battery — why?

On the first charge cycle with a new cell, the charge IC sometimes falls back to standard charge rate because the BMS on the replacement cell hasn't yet completed its initial handshake with the phone's power management IC. This is normal on the first cycle. Charge to 100% at the slower rate, let the phone discharge naturally, then charge again — fast charge protocol acceptance is typically restored by the second cycle once the BMS and charge IC have completed their negotiation.

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GreatCall Jitterbug Smart 2 Replacement Battery, 3.85V, 3000mAh, Li-Polymer 1

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