BHC-11 Sony Ericsson A2638 Replacement Battery 3.7V 1400mAh
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BHC-11 Sony Ericsson A2638 Replacement Battery 3.7V 1400mAh - 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.
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
BHC-11 Sony Ericsson A2638 Replacement Battery 3.7V 1400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1400mAh
Sony Ericsson A2638 Series — 3.7V Li-ion Replacement Battery (BHC-11)
This is a 3.7V 1400mAh Li-ion replacement for the original BHC-11 battery. It fits the Sony Ericsson A2638, A2218, A2618s, and R300 — phones that share the same battery bay dimensions and connector pinout. Capacity matches the factory cell at 1400mAh (5.18Wh).
- A2638 / A2218 / R300 platform fit: These models use the same 3.7V rail, identical connector orientation, and a shared BMS handshake protocol. One battery revision covers the full range without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the A2638 platform. The BMS accepted charge current without fault flags, and voltage held stable under modem-active load across the full discharge curve.
- Fuel gauge recalibration on first use: After installing this cell, run one full uninterrupted discharge down to automatic shutdown, then charge to 100% without interruption. This gives the fuel gauge IC a clean reference curve for the new cell before the OS starts reporting percentage to the user.
Why the A2638 reports wrong battery percentage after a cell swap
The A2638 uses a coulomb-counting fuel gauge IC that builds its charge model against the original cell's discharge curve. When a new cell goes in, the IC still references the old curve — so the percentage shown on screen doesn't match actual cell state. The mismatch can show up as a sudden jump from 40% to full, or a slow drain that reads 60% right until shutdown. One complete discharge-charge cycle resets the counter and trains the IC against the new cell's actual curve.
Sudden shutdown at 20–30% on the replacement cell
This is a voltage cliff issue, not a capacity fault. Under peak load — active call, screen at full brightness, radio scanning — cell voltage can drop faster than the fuel gauge IC expects, hitting the BMS low-voltage cutoff while the display still shows 20–30%. The BMS trips at approximately 3.0V per cell to protect the chemistry. After shutdown, leave the phone off and place it on charge immediately; this lets the cell recover above the cutoff threshold before you power on again.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Sony Ericsson
- 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
My Sony Ericsson A2638 won't turn on at all after the replacement battery sat in a drawer for a few months — is the battery dead?
The BMS locks out when cell voltage drops below roughly 2.5V during storage, cutting all output to prevent cell damage. Plug the phone into a wall charger and leave it connected for at least 30 minutes without pressing the power button — the charge IC needs time to trickle current into the cell before the BMS will release the lockout. Once voltage climbs back above 3.0V the BMS resets and the phone will power on normally. If the charge indicator shows nothing after 45 minutes, try a different cable and adapter before assuming the cell is unrecoverable.
The battery percentage on my A2638 jumps around erratically — sometimes it gains 10% by itself without charging. What's causing that?
The fuel gauge IC on the A2638 is recalibrating against the new cell's discharge curve, and the coulomb counter hasn't yet built an accurate model. Until it completes a full reference cycle, percentage readings can jump, stall, or briefly tick upward as the IC corrects its estimate. Run one uninterrupted full discharge to automatic shutdown, then charge to 100% in a single session without unplugging. After that cycle the readings stabilise because the IC has a clean discharge curve to work from.
Fast charging stopped working after I swapped in the new BHC-11 — the phone just charges slowly now. How do I fix it?
On the first cycle after a cell swap, the charge IC defaults to a conservative current limit because it hasn't yet verified the new cell's impedance profile. This can block the proprietary fast-charge handshake from activating, leaving the phone on standard trickle current. Complete one full standard-rate charge to 100% without interruption — this gives the charge IC the data it needs to confirm cell health. On the second charge cycle, fast charging should resume at normal current.
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