Samsung Galaxy Alpha EB-BG850BBE Replacement Battery 3.85V 1700mAh
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Samsung Galaxy Alpha EB-BG850BBE Replacement Battery 3.85V 1700mAh - 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 Galaxy Alpha EB-BG850BBE Replacement Battery 3.85V 1700mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.85V
Amp
1700mAh
Samsung Galaxy Alpha SM-G850 Series — 3.85V Li-ion Replacement Battery (EB-BG850BBE)
This is a 3.85V, 1700mAh Li-ion replacement cell for the Samsung Galaxy Alpha smartphone. It fits the SM-G850, SM-G850F, SM-G850T, and related variants that shipped with the original EB-BG850BBE or equivalent OEM part numbers. Install it when the original cell no longer holds a usable charge across a normal day of calls, browsing, and standby.
- SM-G850 platform fit: The Galaxy Alpha's compact chassis uses a narrow connector pitch and a BMS handshake tied to Samsung's fuel gauge IC. All SM-G850 variants share the same voltage rail and physical cell footprint — 85.88 × 38.68 × 4.40mm — so one cell covers the full model range.
- Bench tested on actual hardware: We ran this cell on an SM-G850F and confirmed the BMS accepted charge handshake on first connection. The fuel gauge IC registered the new cell and began coulomb counting without requiring a manual reset.
- First-cycle fast charge protocol: On first use after installation, disable fast charging and run one full discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins pushing into an uncalibrated state.
Why the Galaxy Alpha reports wrong battery percentage after a cell swap
The Galaxy Alpha uses a coulomb-counting fuel gauge IC that builds its reference model from the original cell's discharge curve over hundreds of cycles. When a new cell goes in, the IC is still referencing the old degraded curve. This mismatch causes the percentage display to read high or low until the IC relearns the new cell. One full discharge from 100% to automatic shutdown, followed by an uninterrupted charge to 100%, forces the IC to recalibrate. After that cycle, percentage readouts stabilise.
Sudden shutdown at 20–30% charge remaining on the replacement cell
This happens when the modem or display draws a short burst of high current and the cell voltage drops below the BMS cutoff threshold — even though the gauge still shows charge remaining. On a freshly installed cell with an uncalibrated fuel gauge, the displayed percentage and the actual state of charge can diverge by 15–25%. The fix is the same recalibration cycle: drain the phone to zero under normal use, let it shut down on its own, then charge to 100% without interruption. After one clean cycle the gauge aligns to the new cell and the early shutdowns stop.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 Alpha powers on after the battery swap but the percentage jumps around — 60%, then 45%, then back to 55% within minutes. What's happening?
The fuel gauge IC is still using the discharge curve it mapped to the old degraded cell, so it miscounts charge on the new one. The coulomb counter corrects itself after one complete reference cycle. Drain the phone fully until it shuts down on its own, then charge uninterrupted to 100% at standard charge speed — not fast charge. After that single cycle the percentage readout will stabilise.
The phone went into a drawer for several months with the new battery inside and now it won't turn on at all — not even the charging screen.
Extended storage drains any Li-ion cell below the BMS lockout threshold, typically 2.5V per cell. When voltage drops that low, the BMS cuts output entirely to prevent damage and the phone shows nothing on screen. Connect the original Samsung charger and leave it undisturbed for 20–30 minutes — the charge IC needs time to trickle current into the locked-out cell before the BMS releases. Once voltage climbs above approximately 3.0V the BMS re-engages and the charging indicator will appear.
Fast charging stopped working after I put in the replacement battery — the phone charges but only at the slow rate now.
Samsung's adaptive fast charge protocol requires a BMS that responds correctly to the charger's handshake on the first cycle. Some replacement cells don't complete that negotiation until after one standard charge cycle initialises the BMS state. Charge the phone once from near-zero to 100% using a standard 5W USB connection, then reconnect your Samsung fast charger. If fast charge still doesn't activate after that cycle, confirm the charger itself outputs the correct 9V adaptive profile — use a USB meter to verify the output voltage when connected.
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