Xiaomi Redmi K30 BM4P Replacement Battery 3.85V 4400mAh
This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.
WECARE5
Check that your old battery model number and device model to match our description. This makes sure they work together.
We ship your order same day if you buy it before 4 PM EST.
Xiaomi Redmi K30 BM4P Replacement Battery 3.85V 4400mAh - is backordered and will ship as soon as it is back in stock.
Let customers speak for us
Send Your Battery Photo
Expert Technician Help
Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.
POST YOUR BATTERY IMAGE
Product & Solutions Expert
✉ sales@batteryweb.com
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.
Xiaomi Redmi K30 BM4P Replacement Battery 3.85V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.85V
Amp
4400mAh
Xiaomi Redmi K30 / K30 5G — 3.85V Li-Polymer Replacement Battery (BM4P)
The BM4P is the OEM-referenced Li-Polymer cell for the Xiaomi Redmi K30 and Redmi K30 5G smartphones (M2001G7AE, M2001G7AC). It runs at 3.85V nominal and delivers 4400mAh (16.94Wh). This replacement restores the original power capacity when the factory cell has aged beyond useful service.
- K30 and K30 5G platform fit: Both variants share the same battery bay dimensions (86.30 × 64.50 × 4.25mm), the same BM4P part number, and the same BMS handshake protocol — one cell covers both boards without modification.
- Bench tested on actual hardware: We cycled the BM4P through charge and discharge on K30 hardware. The BMS accepted the cell without fault codes, and the charge IC applied the correct taper current at the top-of-charge threshold.
- Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge-charge cycle at standard current. The fuel gauge IC recalibrates its coulomb counter against the new cell's discharge curve — skipping this step causes percentage errors on early cycles.
Sudden shutdown at 20–30% on a freshly installed BM4P
This happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. The K30 reads apparent charge remaining from a coulomb counter trained on a degraded cell — the new cell hits a steeper voltage drop under modem or display load than the IC expects, and the system shuts down before the counter reaches zero. It is not a fault with the replacement cell. Run one complete discharge to auto-off, then charge to 100% without interruption. After that cycle the percentage reporting stabilises.
USB-PD or proprietary fast charge not triggering after cell swap
On the first charge after installation, the charge IC sometimes falls back to 5V standard charging and will not negotiate the higher voltage profile. This occurs because the BMS has not yet confirmed cell state to the charge controller. Plug in with the original Xiaomi charger, let the first cycle complete fully at whatever current it accepts, then unplug and reconnect. The fast-charge handshake typically re-engages from the second charge onward once the BMS has a valid state-of-charge reading above 3.7V per cell.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Xiaomi
- 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 Redmi K30 shuts off at around 25% after I put in the new BM4P — is the replacement cell faulty?
The cell is almost certainly fine. The fuel gauge IC on the K30 builds its discharge model from the old cell's voltage curve, and a new cell drops voltage more steeply under 5G modem or screen load than the IC anticipates — triggering a shutdown before the counter reaches zero. Run one full discharge to auto-off followed by a complete charge to 100% without unplugging early. After that single calibration cycle, the shutdowns stop.
The phone feels warm near the battery area during the first few charges on the new cell — is that normal?
Yes, and here is why. A new high-impedance cell forces the charge IC to work harder to push current in during the initial cycles, generating more heat than an aged, low-resistance cell does. The warmth drops noticeably after two or three full cycles as the cell's internal resistance settles. If the back becomes hot to the touch (above roughly 45°C) or charging stops and resumes repeatedly, remove the charger and let the device cool to room temperature before continuing.
My Redmi K30 won't power on at all after the BM4P sat uninstalled in a drawer for several months — what happened?
Li-Polymer cells self-discharge during storage, and if the BM4P dropped below approximately 2.5V the BMS enters a lockout state to prevent damage. The phone will not respond to the power button. Connect the original Xiaomi charger and leave it plugged in for at least 30 minutes without pressing anything — the charge IC applies a low trickle current to bring the cell voltage back above the BMS re-initialisation threshold, after which normal charging resumes automatically.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Related Products
Engineered for Performance. Built to Last.
Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.
-
Up to 21% offNew arrival
BatteryWeb
BBK VIVO NEX Replacement Battery B-E6 3.85V 3900mAh
0.23 lb
Sale priceFrom $26.99 USD Regular price $33.99Unit priceIn stock (66 units) -
-
Up to 21% offNew arrival
BatteryWeb
Vivo NEX B-E6 Replacement Battery 3.85V 3900mAh
0.23 lb
Sale priceFrom $26.99 USD Regular price $33.99Unit priceIn stock (66 units) -
-
Up to 21% offNew arrival
BatteryWeb
Vivo Y50 Replacement Battery B-M3 3.85V 4800mAh
0.25 lb
Sale priceFrom $30.99 USD Regular price $38.99Unit priceIn stock (153 units) -
-
Up to 21% offNew arrival
BatteryWeb
BBK VIVO Y50 Replacement Battery 3.85V 4800mAh
0.25 lb
Sale priceFrom $30.99 USD Regular price $38.99Unit priceIn stock (153 units) -
-
Up to 20% offNew arrival
BatteryWeb
Redmi K30 Replacement Battery 3.85V 4400mAh Li-Polymer
0.24 lb
Sale priceFrom $28.99 USD Regular price $35.99Unit priceIn stock (66 units) -
-
Up to 21% offNew arrival
BatteryWeb
Redmi 10X 4G Replacement Battery 3.85V 4800mAh Li-Po
0.25 lb
Sale priceFrom $30.99 USD Regular price $38.99Unit priceIn stock (156 units) -
-
Up to 21% offNew arrival
BatteryWeb
Xiaomi Redmi Note 9 BN54 Replacement Battery 3.85V 4800mAh
0.25 lb
Sale priceFrom $30.99 USD Regular price $38.99Unit priceIn stock (156 units) -
-
Up to 20% offNew arrival
BatteryWeb
Pocophone Poco F2 Pro 5G Replacement Battery 3.85V 4400mAh
0.24 lb
Sale priceFrom $27.99 USD Regular price $34.99Unit priceIn stock (156 units) -
