Samsung Rogue U520 Replacement Battery AB923446GZB 3.7V 1600mAh
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Samsung Rogue U520 Replacement Battery AB923446GZB 3.7V 1600mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Samsung Rogue U520 Replacement Battery AB923446GZB 3.7V 1600mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1600mAh
Samsung SCH-U520 Rogue — 3.7V Li-ion Replacement Battery (AB923446GZB)
This 3.7V, 1600mAh Li-ion battery replaces the original cell in the Samsung SCH-U520 Rogue. It fits the 2008-era flip phone directly, using OEM-matched part numbers AB923446GZB, AB463446BA, and AB463446BABSTD. Capacity is rated at 5.92Wh — matching the original specification.
- SCH-U520 Rogue compatibility: The Rogue uses a single-cell 3.7V nominal pack with a three-contact connector carrying voltage, ground, and a thermistor line. This cell matches that pin layout and voltage rail so the charge IC recognises it without fault codes.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the SCH-U520 platform. The BMS accepted charge termination cleanly at 4.2V, and the protection circuit tripped correctly on a simulated short without latching the pack into lockout.
- Fuel gauge recalibration on first install: The SCH-U520 stores discharge curve data tied to the old cell. After fitting this battery, run one full discharge down to auto-shutoff, then charge uninterrupted to 100% before normal use — this resets the coulomb counter against the new cell's actual curve.
Why the SCH-U520 reports wrong battery percentage after a cell swap
The Rogue's fuel gauge IC maps voltage against a stored discharge curve learned from the previous cell. A new cell has a different internal resistance profile, so the same voltage reading maps to the wrong state-of-charge. The gauge can show 40% and shut down moments later, or sit at 100% longer than expected. One complete discharge-to-shutoff followed by a full uninterrupted charge resets the calibration data to match the new cell.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops sharply under load — a voltage cliff — before the reported percentage reaches zero. On the SCH-U520, the modem and display pulling current simultaneously can drag cell voltage below the 3.0V protection threshold faster than the fuel gauge tracks it. The BMS cuts power to protect the cell before the OS can log a low-battery event. Letting the cell complete two to three full cycles tightens the fuel gauge's voltage-to-capacity mapping and pushes that cutoff point lower.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Samsung
- Manufacturer: CS
- Series: Extension
- Color: Coffee
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The SCH-U520 shut off at around 25% and now won't turn back on — is the battery dead?
The BMS tripped into lockout after the cell voltage fell below roughly 2.5V under load. This is a protection state, not a dead cell. Connect the phone to a wall charger — not a PC USB port — and leave it for 15–20 minutes without pressing the power button. The charge IC needs to push a trickle current into the cell long enough to lift it above the 2.8V threshold before the BMS will re-enable discharge.
The phone feels noticeably warm near the battery compartment while charging — is that normal with a new cell?
A new Li-ion cell starts with slightly higher internal impedance than a broken-in one. The charge IC pushes the same current into higher resistance, which generates more heat in the first several cycles. We measured surface temperatures on the bench that stayed within safe limits and dropped after three to four full cycles as impedance settled. If the phone feels hot enough to be uncomfortable after five or more cycles, check that the charge port contacts are clean and seated fully — a high-resistance connection at the port compounds the heat at the cell.
After fitting this battery, the percentage jumps around erratically — it reads 60%, then skips to 80%, then drops back — what's causing it?
The coulomb counter in the SCH-U520 is still running its old calibration data against a cell with a different discharge curve. It hasn't lost track permanently — it just needs one anchor point. Drain the phone fully until it shuts itself off, then charge it in one continuous session to 100% without unplugging mid-way. That single complete cycle gives the fuel gauge IC two fixed reference points — empty and full — to rebuild an accurate state-of-charge map against the new cell.
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