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Apple MacBook Pro A2171 Replacement Battery 11.41V 5100mAh

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From $114.99 USD $138.99
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Fits Apple MacBook Pro EMC 3301 models; replaces OEM part A2171 and 616-00675.
11.41V at 5100mAh capacity restores full charge cycles on this 13-inch 2019 MacBook Pro.
Connector seats into the internal battery slot with keyed alignment; no adapter required.
We bench-cycled this cell through ten full charge-discharge runs; BMS accepted firmware handshake without gate faults.
After installation, run one full discharge to sleep-cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after every cell swap.
Delivery time

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

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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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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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

11.41V

Amp

5100mAh

Apple MacBook Pro EMC 3301 — 11.41V Li-Polymer Replacement Battery (A2171 / 616-00675)

This is a 11.41V, 5100mAh (58.19Wh) lithium-polymer battery for the Apple MacBook Pro EMC 3301 13-inch. It fits models MUHN2LL/A, MUHP2LL/A, and MUHQ2LL/A, among others. The OEM part numbers are A2171 and 616-00675.

  • EMC 3301 compatibility: These MacBook Pro 13-inch units from 2019 share a single battery form factor across the Touch Bar and non-Touch Bar variants. The connector, BMS handshake protocol, and cell dimensions are identical across that lineup — one cell fits all covered models.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a MacBook Pro EMC 3301 unit. The BMS negotiated correctly with the SMC, charge acceptance was clean from 0% to 100%, and no thermal or voltage faults were flagged during the session.
  • SMC calibration after install: After fitting this battery, let the laptop discharge completely until it sleeps, then charge uninterrupted to 100% without waking the machine mid-cycle. This gives the System Management Controller a clean baseline against the new cell and clears the false "Service Battery" warning that often appears after a swap.

macOS reporting poor battery health immediately after replacement

The health status in macOS reads from EEPROM data held by the battery's BMS — not from live cell measurements. When a new cell goes in, that EEPROM carries factory-default cycle and capacity values that the SMC hasn't yet validated against real-world charge data. macOS flags this mismatch as degraded health. One full discharge-to-sleep followed by an uninterrupted charge to 100% triggers the SMC battery learn cycle, which rewrites the health estimate against actual cell behaviour. After one or two cycles the health indicator typically updates to Normal.

MacBook Pro shutting down at 20–30% charge shown on screen

This happens when a cell can't hold voltage above the SMC's cutoff threshold under combined CPU and display load — even though the fuel gauge still shows charge remaining. The fuel gauge IC is reading stored charge, but the cell voltage collapses faster than the gauge tracks under load. The fix is a full calibration cycle: run the laptop under normal workload until it shuts itself off, then charge to 100% in one session. After two to three calibration cycles, the fuel gauge IC maps the new cell's actual voltage curve and the premature shutdowns stop.

Compatible Models

Macbook Pro EMC 3301 MUHN2LL/A MUHP2LL/A MUHQ2LL/A MUHR2LL/A MUHR2LL/B MacBook Pro 13 Inch Two Thunderbolt 3 Macbook Pro Retina 13.3 A2159

Replaces Part Numbers

A2171 616-00675

Technical Specifications

Voltage11.41V
Amp Hours5100mAh
Capacity5100mAh
Rate58.19Wh
Net Weight246.4g /8.69 oz
Gross Weight506.4g /17.86 oz
Approximate Weight506.4g /17.86 oz
Dimension 289.46 x 104.10 x 6.10mm

Product Highlights

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

Frequently Asked Questions

macOS shows the battery Wh rating as lower than the spec after I swapped the cell — is that normal?

Yes. The Wh figure macOS displays is pulled from the EEPROM embedded in the battery's BMS, and that value reflects the cell's rated chemistry at factory defaults, not a live measurement. The installed cell here is rated at 58.19Wh, but EEPROM and actual chemistry can read slightly differently until the SMC has run a calibration cycle. Complete one full discharge-to-sleep and uninterrupted charge to 100% — the SMC then recalculates and the reported Wh figure should align with the cell's actual capacity.

The fuel gauge jumps wildly — drops 10% in minutes, then sits at the same number for an hour. What's happening?

The fuel gauge IC inside the MacBook uses a lookup table built from charge and discharge data on the previous cell. After a swap, that table doesn't match the new cell's voltage curve, so percentage estimates are erratic. This isn't a fault with the replacement — it's a calibration gap. Run two to three full discharge and charge cycles under normal use and the fuel gauge IC will rebuild its curve against the new cell. By the third cycle, the percentage readout should track smoothly.

Charge stops at 80% and won't go higher — battery settings show "Optimized Battery Charging" is on. Do I need to disable it?

Optimized Battery Charging is a macOS firmware feature — it learns your daily charge patterns and intentionally holds the cell at 80% until it predicts you'll need a full charge. This is BIOS-level charge control, not a fault in the replacement cell. Hold the Option key, click the battery icon in the menu bar, and select "Charge to Full Now" to override it for that session. If you want the laptop to always charge to 100%, turn Optimized Battery Charging off in System Settings → Battery.

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Apple Macbook Pro EMC 3301 Replacement Battery, 11.41V, 5100mAh, Li-Polymer 1

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