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Samsung Galaxy Mega 5.8 B650AE Replacement Battery 3.7V 2100mAh

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New arrival
From $28.99 USD $35.99
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Fits Samsung Galaxy Mega 5.8, GT-I9152, GT-I9150 models; replaces OEM B650AE and B650AC batteries.
3.7V nominal, 2100mAh capacity delivers 7.77Wh — matches original output for display and processor power.
Connector slides straight into the battery slot with a single plastic locking tab; no tools required.
We bench-tested this cell against the stock fuel gauge IC; BMS accepted charge current without fault codes on insertion.
On first use after installation, disable fast charging for one complete discharge-charge cycle — this lets the coulomb counter recalibrate against the new cell discharge curve before 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

2100mAh

Samsung Galaxy Mega 5.8 / GT-I9150 — 3.7V Li-ion Replacement Battery (B650AE)

This is a 3.7V, 2100mAh Li-ion replacement battery for the Samsung Galaxy Mega 5.8 and Galaxy Mega Duos smartphones. It fits GT-I9150 and GT-I9152 variants using OEM part numbers B650AE and B650AC. Swap it in when your original cell no longer holds a charge through a normal day.

  • GT-I9150 and GT-I9152 compatibility: Both the standard Mega 5.8 and the Duos dual-SIM variant use the same 3.7V battery bay, connector pinout, and BMS handshake — one cell fits both boards without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the GT-I9150 board. The BMS accepted the cell on first connection, charge termination triggered correctly at 4.2V, and the fuel gauge IC reported capacity without error codes.
  • Fuel gauge recalibration after install: On first use, disable any power-saving fast-charge modes and run one complete discharge-to-charge cycle without interruption. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before the system starts making power decisions based on stored data from the old cell.

Sudden shutdown at 20–30% on the Galaxy Mega 5.8

This is a voltage cliff issue, not a capacity issue. The Mega 5.8 runs a large 5.8-inch display alongside dual-SIM radio activity, which pulls current in short, heavy bursts. When the cell voltage sags below roughly 3.4V under that load, the BMS trips a cutoff to protect the cell — even if the fuel gauge still shows charge remaining. A fresh cell with lower internal resistance holds voltage under that load better than a worn original. If shutdowns continue after replacing the cell, run one full calibration cycle to sync the fuel gauge IC to the new cell's voltage curve.

Battery percentage jumping erratically after fitting the new cell

The Galaxy Mega 5.8 stores its fuel gauge calibration data against the discharge curve of the previous cell. After a cell swap, the coulomb counter reads voltage points that no longer match its stored reference table, so the percentage display jumps. This is not a fault with the replacement cell. Fully discharge the phone until it powers off, then charge uninterrupted to 100% — this forces the fuel gauge IC to rewrite its reference curve against the new cell. After one complete cycle, percentage readings stabilise.

Compatible Models

Galaxy Mega 5.8 Galaxy Mega Duos GT-I9152 GT-I9150 SCH-P709 GT-i9158 GT-i9152P Galaxy Mega 5.8 Plus Duos Galaxy Beam 2 GT-G3858 Galaxy Z LTE-A GT-Z9000 GT-Z9005 SM-Z300H/DS Z3 Duos SM-Z300H/DD SM-Z300F/DS Z3 Duos LTE SM-Z3 SM-V101F SM-V101F 4G LTE Mobile WiFi Hotspot

Replaces Part Numbers

B650AE B650AC

Technical Specifications

Voltage3.7V
Amp Hours2100mAh
Capacity2100mAh
Rate7.77Wh
Net Weight40g /1.41 oz
Gross Weight65g /2.29 oz
Approximate Weight65g /2.29 oz
Dimension 63.05 x 56.82 x 5.25mm

Product Highlights

  • Brand: Samsung
  • 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

My Galaxy Mega 5.8 won't turn on at all after sitting in a drawer for months — is the new battery dead?

The BMS on Li-ion cells locks out below approximately 2.5V per cell to prevent damage from deep discharge. A phone left unused for months can drain below that threshold, putting the BMS into lockout before you even install the replacement. 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 trickle current into the cell before the BMS will release and allow normal startup. If the screen stays dark, check that the charger output is at least 5V 1A.

The OS is reporting 100% charge but the phone dies hours earlier than expected — why?

The fuel gauge IC is still running its percentage calculation against the old cell's discharge curve stored in memory. It hits 100% on paper, but the new cell's actual capacity profile doesn't match, so real-world drain looks faster than the percentage suggests. Run one full uninterrupted discharge cycle — let the phone power off on its own — then charge straight to 100% without unplugging early. That forces the coulomb counter to recalibrate its reference data against the B650AE cell's actual curve. After that single cycle, reported and real capacity align.

The phone gets noticeably warm near the battery during the first few charges after the swap — is that normal?

A new cell has slightly higher internal impedance than a cell that has been through dozens of cycles, so more energy converts to heat during the initial charge cycles. On the Mega 5.8, the charge IC doesn't reduce current for a new high-impedance cell on its own — it charges at the same rate it used for the worn original. The warmth is normal for the first two or three full cycles as impedance drops. If the back becomes hot enough to be uncomfortable to hold, stop the charge, let it cool to room temperature, and resume — surface temperature should normalise by the third full cycle.

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