MaxCom MM141 D243 Replacement Battery 3.7V 1700mAh
This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.
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Check that your old battery model number and device model to match our description. This makes sure they work together.
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MaxCom MM141 D243 Replacement Battery 3.7V 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.
MaxCom MM141 D243 Replacement Battery 3.7V 1700mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1700mAh
MaxCom MM141 — 3.7V Li-ion Replacement Battery (D243)
This 3.7V Li-ion battery replaces the original D243 cell in the MaxCom MM141 mobile phone. Rated at 1700mAh (6.29Wh), it restores power to calling, messaging, and basic mobile functions. It matches the original cell's voltage, footprint (66.20 × 44.00 × 5.10mm), and connector orientation.
- MM141 fit confirmation: The MM141 uses a removable back-cover design with a direct cell slot. This replacement matches the original D243 PCM pinout and physical dimensions, so the connector seats without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the MM141 platform. The BMS accepted charge from the device's onboard charge IC without error flags, and voltage held stable under voice call load.
- Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge setting and run one full discharge-to-charge cycle before normal use. This lets the MM141's fuel gauge IC map the new cell's discharge curve before reporting accurate percentages.
Why the MM141 reports wrong battery percentage after a cell swap
The MM141 uses a fuel gauge IC that tracks charge state against a stored discharge curve from the original cell. A new cell has a slightly different internal resistance profile, so the IC's coulomb counter starts out of sync. The phone may show 100% and drop suddenly, or hover at one percentage for a long stretch. One full discharge below 5% followed by a full uninterrupted charge resets the calibration baseline.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC still holds the old cell's voltage-to-capacity curve. At around 3.55–3.60V, the new cell's voltage drops faster than the IC expects under modem or screen load, triggering a low-voltage cutoff before the displayed percentage reaches zero. It looks like a dead battery but is a calibration mismatch. Run one full charge cycle without interruption — the IC recalibrates against the actual voltage cliff of the new cell and the premature shutdowns stop.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: MaxCom
- 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 MM141 won't turn on at all after the new battery sat in a drawer for a few months — is it dead?
The cell likely entered BMS lockout after self-discharging below 2.5V in storage. At that voltage the protection circuit cuts all output to prevent damage. 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 trickle-charges the cell back above the BMS re-enable threshold, typically around 2.9V, after which the phone powers on normally.
The percentage jumps around erratically — 60%, then 45%, then back to 55% within minutes of normal use.
This is the fuel gauge IC recalibrating against the new cell's discharge curve after the swap. The coulomb counter was trained on the original D243's impedance profile, not this cell's. It corrects itself after one full uninterrupted discharge-charge cycle. Drain the phone to auto-shutdown, then charge to 100% without unplugging — the jumping stops once the IC has a complete reference curve.
The phone feels warm near the battery during the first few charges — is the new cell faulty?
A new Li-ion cell has slightly higher internal impedance than a broken-in one, so the charge IC pushes more voltage across the cell to deliver the same current. That extra resistive loss appears as heat during the first two or three charge cycles. We measured surface temperature on the bench and it stayed within normal operating range. If warmth continues beyond the third full charge cycle or the phone becomes hot to hold, stop charging and check that the battery connector is fully seated.
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