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Apple Magic Mouse 2 A1657 Replacement Battery 3.7V 1850mAh

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From $48.99 USD $60.99
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Fits Apple Magic Mouse 2 models A1657 and A1672, replacing OEM part numbers 020-00633 and 020-00634.
3.7V lithium-ion cell rated 1850mAh — delivers the voltage Magic Mouse 2 needs for consistent wireless range and sensor performance across full charge cycles.
Proprietary connector mates directly into the mouse chassis with no adapter required; insertion is one direction only and seats flush against the internal contact plate.
We ran full charge cycles on the BMS circuit and confirmed the cell accepts the Magic Mouse 2 firmware handshake without fault codes or power-on delays.
After swap, hold the pairing button on the mouse base for three seconds even if Bluetooth shows connected — the wireless peripheral needs a fresh pairing cycle to stabilize polling voltage on the new cell.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

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🔹 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: 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

1850mAh

Apple Magic Mouse 2 A1657 / A1672 — 3.7V Li-ion Replacement Battery (020-00633)

This 3.7V 1850mAh Li-ion battery replaces the internal rechargeable cell in the Apple Magic Mouse 2. It fits models A1657 and A1672 — both share the same battery footprint and connector. Dimensions are 51.50 × 33.80 × 10.20mm, matching the original cell's slot exactly.

  • A1657 and A1672 compatibility: Both Magic Mouse 2 revisions use the same 3.7V Li-ion cell with the same BMS communication protocol. Voltage rail and connector are identical across both model numbers, so one battery fits both without modification.
  • Bench tested on actual hardware: We ran this cell in a Magic Mouse 2 A1657 unit. The BMS handshake completed on first connection, macOS reported battery percentage correctly in the menu bar, and charge acceptance from the Lightning port was normal with no error state triggered.
  • Lightning port orientation during charging: The Magic Mouse 2 charges through a port on its underside, making it unusable while plugged in. Charge the mouse fully before a session rather than mid-use — connecting the cable during active work flips the mouse upside down and cuts off tracking entirely.

Why the Magic Mouse 2 stops reconnecting after a battery swap

When the internal cell is fully depleted before replacement, the mouse loses its stored Bluetooth pairing state. The BMS cuts power completely at low voltage to protect the cell, and the onboard memory loses context. After fitting a new battery, the mouse may not automatically reconnect to the paired Mac. Hold the power switch on the underside for three seconds, then toggle Bluetooth off and on in macOS System Settings to force a reconnection without a full re-pair.

Mouse pointer stuttering or skipping as battery voltage drops

The Magic Mouse 2 reduces its Bluetooth polling rate when cell voltage falls below approximately 3.5V. This is normal end-of-life behaviour — the firmware throttles radio activity to stretch remaining charge. The result is visible as intermittent pointer lag or short freezes that worsen progressively. If stuttering persists after fitting a new battery, check macOS System Settings → Battery and confirm the mouse is showing above 20% before dismissing a fault in the new cell.

Compatible Models

A1657 A1672 Magic Mouse 2

Replaces Part Numbers

020-00633 020-00634

Technical Specifications

Voltage3.7V
Amp Hours1850mAh
Capacity1850mAh
Rate6.85Wh
Net Weight36g /1.27 oz
Gross Weight61g /2.15 oz
Approximate Weight61g /2.15 oz
Dimension 51.50 x 33.80 x 10.20mm

Product Highlights

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

Frequently Asked Questions

My Magic Mouse 2 won't reconnect to my Mac after I replaced the battery — what do I do?

A full battery discharge wipes the mouse's stored Bluetooth state, so it won't auto-reconnect after a swap. Toggle the power switch on the underside off and back on, then turn Bluetooth off and on again in macOS System Settings. If the mouse still doesn't appear, go to System Settings → Bluetooth, remove the Magic Mouse entry, and re-pair it fresh. The mouse should reconnect within 30 seconds of re-pairing.

The pointer is jumping and lagging even with the new battery installed — is the battery faulty?

Check the battery contact pads on the mouse's internal connector for any oxidation or debris from the old cell — a poor connection causes intermittent voltage drops that mimic a weak battery. Clean the contacts with a dry cotton swab, reseat the battery, and confirm macOS reports a charge level above 20% in System Settings → Battery. If the percentage climbs normally during charging and the stutter stops above 3.6V, the connection was the issue, not the cell.

macOS is showing the battery percentage dropping faster than expected — why?

The Magic Mouse 2 draws more power when the sensor tracking surface has high contrast or fast movement, and RGB-heavy desktop setups can push the radio harder. Verify the mouse firmware is current via System Settings → General → Software Update, since older firmware had known power-management bugs. If drain is still abnormal, check whether any accessibility features like pointer magnification are active — these increase polling frequency and raise idle draw. A healthy replacement cell at 3.7V nominal should sustain normal office use across multiple working days between charges.

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