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Samsung Galaxy Jean EB-BJ805ABE Compatible Battery 3.85V 3400mAh

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Fits Samsung Galaxy Jean, Galaxy A6+, and Galaxy A9 Star Lite with EB-BJ805ABE connector.
3.85V, 3400mAh lithium-polymer cell restores full talk time on the Galaxy Jean platform.
Connector slides into the standard Samsung battery slot with no modification required.
We bench-tested this cell against the OEM discharge curve; fuel gauge recalibration took one full cycle.
On first use after installation, disable fast charging for one complete discharge-charge cycle to let the fuel gauge IC recalibrate against the new cell's discharge curve before USB-PD pushes current into an uncalibrated BMS.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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

3400mAh

Samsung Galaxy Jean / A6+ 2018 — 3.85V Li-Polymer Replacement Battery (EB-BJ805ABE)

This is a 3.85V, 3400mAh Li-Polymer cell that replaces OEM part EB-BJ805ABE in the Samsung Galaxy Jean, Galaxy A6+ 2018 Duos, Galaxy A6 Plus 2018 Duos, and Galaxy A9 Star Lite, among others. It matches the original cell footprint at 91.10 × 45.50 × 4.90mm and uses the same flex connector the motherboard expects. Capacity is rated at 3400mAh (13.09Wh).

  • Galaxy A6+ and Jean platform compatibility: These models share the same 3.85V power rail, identical flex connector pinout, and the same BMS handshake protocol — which is why one cell covers the full variant range including Duos SKUs.
  • Bench tested on actual hardware: We ran this cell on a Galaxy A6+ 2018 board. The BMS accepted the cell without error flags, charge IC stepped through trickle, CC, and CV phases normally, and the fuel gauge IC logged a full cycle without dropping to safe mode.
  • Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard current. This gives the fuel gauge IC a clean discharge curve from the new cell before high-current charging pushes against an uncalibrated state-of-charge estimate.

Why the Galaxy Jean reports wrong battery percentage after a cell swap

Samsung's fuel gauge IC builds a discharge curve from historical cycle data stored against the old cell. When you swap the physical cell, that learned curve no longer matches the new cell's actual voltage-to-capacity relationship. The OS reads voltage from the IC and maps it to a percentage using the stale curve — so 40% displayed might be 25% actual. One full discharge down to automatic shutdown, followed by a full charge to 100%, forces the coulomb counter to reset and write a new baseline curve.

Sudden shutdown at 20–30% on the Galaxy A6+ after replacement

This happens when the cell voltage drops below the modem or display load threshold faster than the fuel gauge IC predicted — a voltage cliff. Under peak draw from LTE transmission or screen-on brightness, the cell briefly sags below 3.4V and the BMS trips a protective cutoff before the displayed percentage reaches zero. It is not a fault with the cell itself. Run the first full recalibration cycle, then check that the shutdown stops occurring above 15% — if it persists, confirm the flex connector is fully seated and re-check contact resistance at the board-side pads.

Compatible Models

Galaxy Jean Galaxy A6+ 2018 Duos Galaxy A6 Plus 2018 Duos Galaxy A9 Star Lite SM-A605FN SM-A6058 SM-A605F/DS SM-A605K SM-A605G/DS SM-A605FN/DS

Replaces Part Numbers

EB-BJ805ABE GH82-16480A

Technical Specifications

Voltage3.85V
Amp Hours3400mAh
Capacity3400mAh
Rate13.09Wh
Net Weight47.6g /1.68 oz
Gross Weight83g /2.93 oz
Approximate Weight83g /2.93 oz
Dimension 91.10 x 45.50 x 4.90mm

Product Highlights

  • Brand: Samsung
  • 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

My Galaxy Jean won't turn on at all after the replacement battery sat in a drawer for months — is the cell dead?

It is almost certainly in BMS lockout, not dead. Li-Polymer cells that self-discharge below roughly 2.5V per cell trigger a hard BMS cutoff that blocks normal boot. Plug the phone into a wall charger — not a PC port — and leave it for 20–30 minutes without pressing the power button. The charge IC will trickle current into the cell until voltage climbs above the BMS recovery threshold, after which the phone will boot normally.

Fast charging stopped working on the Galaxy A6+ 2018 right after I installed this battery — the phone only charges slowly now.

On the first cycle after a cell swap, Samsung's charge IC sometimes falls back to standard current while it verifies the new BMS handshake. This is expected behaviour, not a fault. Run one complete standard charge to 100%, then disconnect and reboot the phone. On the second charge cycle the IC re-negotiates the fast charge protocol and full current resumes — confirm by checking Settings > Battery > Charging status while plugged in.

The battery percentage on my Galaxy Jean keeps jumping — it'll show 45%, then suddenly drop to 31%, then climb back up without charging.

Erratic percentage jumps after a cell swap mean the fuel gauge IC is actively recalibrating against the new cell's discharge curve, and its state-of-charge estimate is unstable. This resolves after one full cycle. Drain the phone to automatic shutdown, then charge uninterrupted to 100% with the screen off and fast charging disabled. Once that cycle completes, the coulomb counter locks onto a stable baseline and percentage readings settle.

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