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MaxCom M55 Replacement Battery 3.7V 900mAh Li-ion

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From $23.99 USD $29.99
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Fits MaxCom M55, MM35D, MM36D, MM105 and replaces OEM battery CS-KMC500SL.
3.7V 900mAh Li-ion cell delivers 3.33Wh for calls, messaging, and basic smartphone use.
Connector slides into MaxCom battery slot with standard contact alignment and retention tab.
We bench-tested the BMS on discharge curve against the M55 fuel gauge circuit without premature cutoff.
On first charge after installation, complete one full discharge-charge cycle before resuming normal use — the fuel gauge IC needs to recalibrate against this cell's discharge curve.
Delivery time

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

Discount: As a thank you for your patience, enjoy 5% off on your order
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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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

900mAh

MaxCom M55 / MM35D / MM36D / MM105 Series — 3.7V Li-ion Replacement Battery

This is a 3.7V 900mAh Li-ion battery for the MaxCom M55 and compatible models including the MM35D, MM36D, and MM105. It covers a wide range of MaxCom handsets that share the same cell footprint and connector layout. Capacity is 3.33Wh as rated.

  • M55, MM35D, MM36D, MM105 and extended range: These models share a common 3.7V single-cell architecture with the same physical connector and BMS handshake protocol. Swapping between them uses the same cell format, so one replacement covers the full group without voltage rail or connector conflicts.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the M55 platform. The onboard BMS accepted charge current without fault flags, and the fuel gauge IC tracked cell state across the full discharge curve as expected.
  • First-cycle fuel gauge reset: After fitting this battery, disable fast charging if your device supports it and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its calibration points against the new cell's discharge curve before it starts reporting percentage to the OS accurately.

Why the M55 reports wrong battery percentage after a cell swap

The MaxCom M55 uses a fuel gauge IC that builds its percentage model from the discharge curve of the original cell. When a new cell goes in, the IC is still referencing the old curve — so early readings will be off, sometimes by 15–25%. The gauge recalibrates itself over one or two full charge-discharge cycles by relearning the voltage-to-capacity relationship of the new cell. Until that calibration completes, percentage jumps and unexpected low-battery warnings are normal. Run the phone to near-empty and charge it fully twice to stabilise the readout.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC is still calibrated to the old cell and the new cell hits a voltage cliff under load — typically when the modem fires or the screen brightness peaks — that the gauge didn't predict. The cell voltage drops below the BMS cutoff threshold faster than the percentage counter catches up. The fix is the same recalibration cycle: drain the battery until the phone shuts off on its own, then charge uninterrupted to 100% without removing it. After two full cycles the gauge aligns to the new cell's actual voltage floor, and shutdowns at false-high percentages stop.

Compatible Models

M55 MM35D MM36D MM105 MM105DS MM128 MM129 MM132 MM132BB MM133 MM133BB MM136 MM136BB MM142 MM143 MM355 MM355BB MM400 MM400BB MM422 MM428 MM428BB MM430 MM430BB MM431 MM431BB MM432 MM432BB MM435 MM435BB MM440 MM440BB MM450 MM450BB MM450BB Plus MM460 MM460BB MM461 MM461BB MM462 MM462BB MM560 MM560BB MM570 MM570BB MM705 MM705BB MM710 MM710BB MM715 MM819 MM819BB MM820 MM820BB MM821 MM821BB MM823

Technical Specifications

Voltage3.7V
Amp Hours900mAh
Capacity900mAh
Rate3.33Wh
Net Weight16g /0.56 oz
Gross Weight41g /1.45 oz
Approximate Weight41g /1.45 oz
Dimension 53.00 x 34.00 x 4.80mm

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 phone powered off and now won't turn on at all after the new battery sat in a drawer — is it dead?

No — the cell has most likely gone below 2.5V and the BMS has locked it out to prevent further discharge 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 will trickle current into the cell until voltage climbs above the BMS recovery threshold, at which point the phone will boot normally. If nothing happens after 45 minutes on the wall charger, try a different cable — a high-resistance cable won't deliver enough current to trigger recovery.

Fast charging stopped working on the first day after fitting this battery — was it working before?

Fast charge protocols — whether USB-PD or a proprietary handshake — require the BMS on the new cell to complete an initial negotiation cycle with the charge IC before higher current is accepted. On the first charge after installation, many devices default to standard 5V charging as a safety measure. Charge the phone fully once at standard rate, let it discharge to below 20%, then charge again — fast charge typically re-engages on the second cycle once the BMS has completed its initial handshake. Check that the charger and cable both support the protocol your device expects.

The phone feels warm near the battery compartment while charging — is that normal with a new cell?

A new cell at full factory charge has higher internal impedance than a conditioned one, which means slightly more energy is lost as heat during the first few charge cycles. Warmth near the battery compartment during charging is expected and reduces after two or three full cycles as impedance settles. If the phone becomes hot to the touch — not just warm — stop charging and check that the charger output matches the rated input for the device. Charging should produce warmth, not heat you can't hold your hand against.

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