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Samsung SGH-C400 Replacement Battery 3.7V 850mAh BST3108BE

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From $21.99 USD $27.99
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Fits Samsung SGH-C400 and SGH-C408 handsets replacing OEM part BST3108BE and equivalent variants.
3.7V, 850mAh lithium-ion cell restores full charge cycles to aging phones that won't hold power.
Flat connector slides into the battery compartment with the contact face forward and locks flush.
Bench testing showed stable voltage delivery under standby load with no BMS cutoff or drift.
On first charge after installation, allow one complete discharge-recharge cycle before regular use to recalibrate the fuel gauge IC.
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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

850mAh

Samsung SGH-C400 / SGH-E250C Series — 3.7V Li-ion Replacement Battery (BST3108BE)

This is a 3.7V, 850mAh (3.15Wh) Li-ion cell that fits the Samsung SGH-C400, SGH-C408, SGH-E250C, SGH-E258, and over 100 additional Samsung handsets sharing the same battery bay and connector. It replaces OEM parts BST3108BE, AB043446LE, AB043446BE, and related variants. If your original cell no longer holds a charge or the phone won't power on, this is the direct cell swap.

  • SGH-C400 and E250C platform fit: These handsets share the same 3.7V single-cell architecture, physical footprint (49.50 × 33.80 × 4.70mm), and edge connector pinout. The BMS handshake on each model expects the same voltage rail, so one cell covers the full compatibility list without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on SGH-series hardware. The BMS accepted the cell without fault flags, voltage held steady at 3.7V nominal, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
  • Fuel gauge recalibration on first cycle: After fitting this cell, run one complete discharge down to auto-shutdown, then charge uninterrupted to 100%. The phone's fuel gauge IC was calibrated against the old cell's discharge curve — skipping this step causes the percentage counter to read inaccurately from the start.

Why the SGH-C400 reports wrong battery percentage after a cell swap

The SGH-C400 uses a coulomb-counting fuel gauge IC that builds its capacity model from prior discharge history. When you replace the cell, that history no longer matches the new cell's actual chemistry and internal resistance. The gauge continues using the old curve, so it over- or under-reports remaining charge. One full discharge-to-shutdown followed by a complete uninterrupted charge resets the reference point and brings the percentage display back into alignment with real cell state.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC still expects the voltage sag profile of the original, aged cell. The new cell drops voltage more sharply under screen or radio load at lower charge states than the gauge anticipates. When cell voltage falls below roughly 3.4V under load, the BMS trips the protection circuit before the display percentage reaches zero. The fix is the same full discharge-recharge cycle — once the gauge maps the new cell's discharge curve, the shutdown threshold aligns correctly with the displayed percentage.

Compatible Models

SGH-C400 SGH-C408 SGH-E250C SGH-E258 SGH-E420 SGH-E428 SGH-E908 SGH-X168 SGH-E878 SGH-D528 SGH-C120 SGH-i320 SGH-X208 SGH-X680 SGH-E350 SGH-E360 SGH-D728 SGH-X158 SGH-X300 SGH-X308 SGH-X969 SGH-X979 SGH-C128 SGH-C158 SGH-A701 SGH-E870 SGH-S401 SGH-F258 SGH-E218 SGH-X568 SGH-M620 SGH-E251 SGH-F250 SGH-B130 SGH-B300 SGH-B320 SGH-B520 SGH-C130 SGH-C140 SGH-C260 SGH-C300 SGH-D520 SGH-D720 SGH-D730 SGH-E210 SGH-E250 SGH-E380 SGH-E500 SGH-E900 SGH-M150 SGH-X150 SGH-X160 SGH-X200 SGH-X210 SGH-X500 SGH-X510 SGH-X520 SGH-X530 SGH-X630 SGH-M200 SGH-C450 SGH-C520 SGH-C268 SGH-S501i SGH-S401i SGH-P900 SGH-B2100 SGH-B100 GT-C5212 SGH-P920 SGH-P910 SGH-M110 GT-S3030 SGH-X180 SGH-X680v GT-S3100 SGH-C308 SGH-X518 SGH-C188 SGH-B508 SGH-S299 GT-S3110C GT-S3030C GT-E1120C GT-E2100C GT-E1310C GT-E1360C GT-E2210C GT-M2710C GT-E1080 GT-E1100 GT-E1107 GT-E1120 GT-E1310 GT-E1360 GT-E2100 GT-E2120 GT-S3110 GT-S5150 Glamour Slash M310 GT-E2210 SPH-M300 SPH-M305 SGH-A237 SGH-A157 SGH-1167

Replaces Part Numbers

BST3108BE BST3108BC BST3108BEC BST3108BEC/STD AB043446LE AB043446BE AB043446BC AB463446BC AB043446LN AB043446LA

Technical Specifications

Voltage3.7V
Amp Hours850mAh
Capacity850mAh
Rate3.15Wh
Net Weight17g /0.60 oz
Gross Weight42g /1.48 oz
Approximate Weight42g /1.48 oz
Dimension 49.50 x 33.80 x 4.70mm

Product Highlights

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

Frequently Asked Questions

The phone shut off at around 25% and now won't turn back on — is the new battery dead?

It is not dead. The BMS locked out the cell when voltage dropped below approximately 3.0V under load, which happens when the fuel gauge IC trips the cutoff using an old discharge curve that doesn't match the new cell. Plug the phone into a charger and leave it for 15–20 minutes without pressing the power button — the charge IC needs time to push enough current into the locked-out cell to bring it above the 3.0V BMS re-enable threshold. Once it crosses that floor, the phone will power on and charge normally.

After fitting the replacement, the battery percentage jumps around erratically — 60%, then 45%, then 72% within minutes. What's wrong?

Nothing is wrong with the cell itself. The coulomb counter in the SGH-series fuel gauge IC is recalibrating against a cell it has no discharge history for, so the percentage estimate swings as it samples voltage under varying loads. Run one complete discharge cycle — use the phone normally until it shuts itself off automatically, then charge it to 100% in a single uninterrupted session. After that cycle, the gauge has a real reference curve and the percentage stabilises.

The phone feels warm near the battery compartment while charging the new cell — should I stop charging?

Mild warmth during the first few charge cycles is normal. A new cell typically has slightly higher internal impedance than a broken-in one, so the charge IC dissipates more energy as heat while pushing current into it. If you can hold your hand against the back cover without discomfort, the temperature is within safe range. If the back becomes too hot to touch, disconnect and check that no third-party charger is overdriving the charge voltage above 4.2V.

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