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2PCS LIR1240 55mAh 3.6V Li-ion rechargeable coin cell battery for Sony TWS earphones, two batteries side by side on white background
LIR1240 55mAh 3.6V rechargeable lithium coin cell battery 2PCS package for Sony WF-LS900N and WF-1000XM5, front view showing two batteries in sealed packaging with product label and compatibility information
LIR1240 55mAh 3.6V Li-ion coin cell battery installation diagram inside Sony TWS earbud, showing battery compartment and connection points

LIR1240 55mAh 3.6V Battery 2PCS for Sony WF-LS900N WF-1000XM5 LinkBuds S CP1240

Original price was: $15.99.Current price is: $12.99.

🔘 LIR1240 55mAh 3.6V (2PCS) | 🔋 Li-ion Coin Cell | 🎧 For Sony WF-LS900N / WF-1000XM5 / LinkBuds S CP1240 Replacement

8 in stock

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SKU: lir1240 x 2PCS Category: Tags: , , , , , ,
📦 Shipping, Warranty & After-Sales Information (Click to expand ▼)

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Warranty Period90 days from delivery15-30 days from order confirmation
When It Starts📦 Upon delivery⚠️ Upon order confirmation (even before you receive it)
Claims HandlingWe do it directly — email usAutomated dispute system, seller dependent
After Window ExpiresStill can contact us for supportNo recourse, seller can ignore you

🔋 90-day warranty is the industry standard for replacement batteries. Batteries naturally lose capacity over time — this normal wear is not covered. Warranty applies to manufacturing defects only.

📦 Shipping Cost & Delivery Time (Economy Shipping from China)

📦 Note: Batteries are classified as hazardous goods and must be shipped via specialized channels, which may take slightly longer than standard couriers. Delivery times are estimates and may be affected by customs, weather, or other unforeseen circumstances. If your country is not listed in the table below, we are currently unable to ship batteries to that destination.

DestinationFreight (USD)Est. Delivery Time
United States$7.808–15 days
Canada$6.8018–30 days
Mexico$10.0030–60 days
Germany, France, United Kingdom, Greece$6.5018–30 days
Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Hungary, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland$8.0018–30 days
Croatia, Finland, Lithuania, Latvia, Slovenia$8.0030–50 days
Bulgaria, Romania$14.0030–50 days
South Korea, Japan, Australia, New Zealand, Israel, Malaysia, Singapore, Thailand, Philippines, Kazakhstan$7.5018–30 days
United Arab Emirates, Saudi Arabia, Vietnam, Chile, Peru, Colombia, Brazil$18.0025–60 days

🇧🇷 Note for Brazil: Brazilian customs can occasionally cause delays of up to 80 days or more. And please indicate the recipient's CPF, as it is required for Brazilian customs and shipping. Thanks! We appreciate your understanding.

🇪🇺 Note for EU countries: Due to new EU customs regulations effective July 1, 2026, a flat tariff fee of $4.00 (approx. €3.50) applies to shipments to EU countries. This fee covers customs tariff, handling, and payment processing costs, and will be added at checkout. Thank you for your understanding.

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Description

✅ Condition: Brand New – Never used, factory-tested quality

✅ 55mAh High Capacity – Restores full playtime for TWS earbuds (2 batteries per pack)

✅ CE / RoHS / UN38.3 Certified

✅ 90-Day Warranty from delivery – Longer coverage than major platforms

✅ Ships in 3-7 days with tracking

🛡️ Shipping Protection Available at Checkout

✅ PayPal Buyer Protection included

⚠️ Low Stock Alert: Only 8 left in stock. Order now to avoid waiting.

Battery model: LIR1240 (compatible replacement for CP1240)
Quantity: 2 batteries per pack
Capacity: 55mAh per battery
Nominal voltage: 3.6V
Full charge voltage: 4.2V
Battery type: LIR (Rechargeable Li-ion coin cell) – Grade A cells
Dimensions: 12mm diameter × 4mm thickness
Weight: approx. 2.8g per battery
Compatible with: Sony WF-LS900N, WF-LS900B, WF-1000XM5, WF-1000XM4, LinkBuds S, LinkBuds Fit, LinkBuds, and other TWS earphones using CP1240/LIR1240 batteries
Package include: 2 x batteries
Breathe new life into your wireless earbuds with this 2-pack of LIR1240 55mAh rechargeable coin cells. Over time, the tiny batteries inside TWS (True Wireless Stereo) earbuds naturally degrade — after 2-3 years of daily use, you may notice significantly shorter playtime, one earbud dying before the other, or the need to recharge the case more frequently. This LIR1240 battery pack is a direct replacement for the common CP1240 battery used in Sony’s premium earbuds and many other TWS models. Each 12mm × 4mm coin cell delivers 55mAh capacity at 3.6V nominal voltage (4.2V full charge), restoring the original playtime and call quality of your earbuds. Built with grade A cells and protection against overcharge and over-discharge. CE, RoHS, and UN38.3 certified for safety.
Why Replace Both Earbud Batteries — And Why LIR1240 is the Right Choice: TWS earbuds use identical batteries in the left and right units. Over time, both batteries degrade at roughly the same rate. Replacing only one side will result in unbalanced performance — one earbud lasting significantly longer than the other, causing the charging case to stop charging once the fuller battery reaches full capacity, leaving the other partially charged. This 2-pack ensures you replace both batteries simultaneously for balanced playtime and charging. The LIR1240 is a rechargeable lithium-ion coin cell specifically designed for TWS earbuds — it is not a standard non-rechargeable CR series coin cell. The LIR designation indicates “Lithium-Ion Rechargeable,” with a nominal voltage of 3.6V and full charge voltage of 4.2V (standard for lithium-ion chemistry). Sony’s CP1240 battery is the same cell branded under Sony’s part number — LIR1240 is the generic industry standard. Both are identical in size, voltage, and capacity. This battery is suitable for: Sony WF-1000XM5 (5th gen flagship), Sony WF-1000XM4 (4th gen flagship), Sony LinkBuds S (compact model), Sony LinkBuds Fit, Sony WF-LS900N / LS900B, and many other TWS earbuds from various brands that use the 12×4mm form factor.
Compatibility Note: Fits TWS earbuds and charging cases that use 12×4mm rechargeable lithium coin cells with CP1240 or LIR1240 specifications. Common compatible models include Sony WF-1000XM5, WF-1000XM4, LinkBuds S, LinkBuds Fit, and WF-LS900N. Please verify your original battery size (12mm diameter × 4mm thickness) before purchasing. This battery is for the earbuds themselves, NOT the charging case — the case uses a different larger battery. Professional installation is strongly recommended — soldering is required to replace these coin cells. If your earbud uses a different battery model or size, this battery will not fit.

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Frequently Asked Questions

The LIR1240 battery for Sony WF-LS900N and other TWS earbuds is compatible with a wide range of Sony models, including Sony WF-LS900N, WF-LS900B, WF-1000XM5, WF-1000XM4, LinkBuds S, LinkBuds Fit, and LinkBuds. For LIR1240 battery compatibility with Sony WF-1000XM5 and LinkBuds S, these earbuds use the 12mm × 4mm coin cell format. LIR1240 and CP1240 are functionally identical — both are 3.6V nominal, 4.2V full charge, approximately 55mAh capacity lithium-ion rechargeable coin cells. CP1240 is likely Sony's specific part number, while LIR1240 is the generic industry designation. For CP1240 vs LIR1240 TWS battery replacement, they are interchangeable. For Sony WF-LS900N battery replacement, this 2-pack LIR1240 is the correct choice. Always check your original battery size (12mm diameter × 4mm thickness) before ordering. This battery is not compatible with non-rechargeable CR series batteries (3V) or larger coin cells used in other devices.

The LIR1240 55mAh battery for TWS earbuds has a capacity of 55mAh per cell and a nominal voltage of 3.6V, with a full charge voltage of 4.2V. For LIR1240 55mAh battery performance in Sony WF-1000XM5, a fresh battery restores the original playtime of approximately 6-8 hours with ANC off and 4-5 hours with ANC on. For LinkBuds S battery life restoration with LIR1240, expect similar performance — around 6 hours of continuous playback. For Sony WF-LS900N LIR1240 battery capacity, the 55mAh cell provides enough power for a full day of intermittent use. These LIR1240 coin cells are also compatible with many Sony CP1240 replacement for earbuds applications. The battery is built with grade A cells and includes protection against overcharge and over-discharge. For TWS earbuds battery maintenance, use a compatible 4.2V Li-ion charger and avoid completely draining the battery below 2.5V. For best performance, replace both earbud batteries at the same time to maintain balanced playtime and charging between left and right buds.

Professional LIR1240 battery installation for Sony WF-1000XM5 and other TWS earbuds is strongly recommended. Replacing TWS earbud batteries requires soldering, as the LIR1240 battery is connected via spot-welded tabs or soldered directly to the earbud's circuit board. The process also requires carefully opening the earbud housing without damaging delicate components like the driver, microphone, or ANC system. For Sony WF-LS900N battery replacement guide, you will need a fine-tip soldering iron (350°C), tweezers, plastic opening tools, and flux. For LIR1240 coin cell replacement in LinkBuds S, the battery is typically soldered to the PCB with two tabs — you must desolder the old one and solder the new one, ensuring correct polarity. To replace CP1240 battery in Sony TWS earbuds, many online repair forums offer model-specific video tutorials. If you are not experienced with micro-soldering, please take it to a professional electronics repair shop — they typically charge $20-40 for this service. For Sony WF-LS900N battery repair instructions, always power off the earbuds and remove them from the charging case before starting. We are not responsible for damage caused during DIY installation. If you choose to DIY, watch a full tutorial video for your specific earbud model before starting and practice on scrap boards first.

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