BL310 2500mAh 3.85V Li-Polymer replacement battery for Lenovo Legion Duel and Duel Pro L79031 gaming smartphone
BL312 2500mAh 3.85V Li-Polymer replacement battery for Lenovo Legion Duel and Duel Pro L79031 gaming smartphone

BL310 BL312 2500mAh 3.85V Li-ion Polymer Replacement Battery for Lenovo Legion Duel Pro L79031 65W Gaming Phone

$20.59

🔘 BL310 / BL312 2500mAh 3.85V | 🔋 Li-ion Polymer Dual-Battery | 🎮 For Lenovo Legion Duel / Pro L79031 65W Gaming Phone

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SKU: BL310-BL312 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

✅ 2500mAh High Capacity per Cell – Restores 5000mAh total dual-battery gaming power

✅ 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

✅ 100% Compatibility Guarantee – If it doesn’t fit, we’ll refund you. No questions asked.

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

Battery model: BL310 (left battery) / BL312 (right battery) — select correct model from dropdown
Capacity (per cell): 2500mAh / 9.63Wh
Total system capacity: 5000mAh (two cells working together)
Rated voltage (per cell): 3.85V
Charge limit voltage (per cell): 4.4V
Battery type: Li-ion Polymer — Dual-battery architecture for gaming phone (Grade A cells)
Compatible with: Lenovo Legion Duel (L79031), Lenovo Legion Duel Pro
Package include: 1 x battery (BL310 or BL312 based on your selection)
Restore your Lenovo Legion Duel or Duel Pro gaming phone with this BL310 or BL312 2500mAh replacement battery. The Legion Duel series was Lenovo’s first dedicated gaming smartphone, featuring a radical side-pop-up camera, dual USB-C ports (bottom AND side for landscape charging), twin cooling fans, and a distinctive dual-battery architecture that sets it apart from ordinary phones. Each battery cell provides 2500mAh, wired in parallel to deliver a total of 5000mAh capacity — a design that enables 65W fast charging while keeping the phone cooler during intense gaming sessions. This Li-ion Polymer replacement battery restores the full 2500mAh per cell, bringing back the marathon gaming endurance the Legion Duel was known for. Built with grade A cells and multi-layer safety protection against overcharge, over-discharge, and short circuits. CE, RoHS, and UN38.3 certified.
Why Dual-Battery Design Matters — And How to Replace Correctly: The Lenovo Legion Duel and Duel Pro use two separate batteries: BL310 (located on the left side of the motherboard) and BL312 (on the right side). They work as a matched pair, delivering power simultaneously. This design has three major gaming advantages: 1) 65W fast charging splits current between both cells, reducing heat generation compared to single-cell high-wattage charging. 2) The phone can pull power from both cells during peak gaming loads (120fps titles, highest brightness), preventing voltage drops. 3) If one cell degrades, the phone still works but total capacity is halved. After 3-4 years of heavy gaming use, both original batteries have likely degraded significantly. Common symptoms: battery drains noticeably faster during gaming, the phone needs charging before a gaming session finishes, the battery percentage drops rapidly from 30% to shutdown, or 65W charging takes much longer than the original 30 minutes to full. This listing allows you to replace BL310 or BL312 individually — but for best results, replace both batteries at the same time. Mixed old and new cells can cause unbalanced charging, where the phone stops charging when the older cell reaches full voltage, leaving the new cell only partially charged. The Legion Duel’s 6.65-inch 144Hz AMOLED display and Snapdragon 865+ processor demand stable power — degraded batteries can cause frame drops or unexpected shutdowns during competitive gaming.
Compatibility Note: Fits Lenovo Legion Duel and Legion Duel Pro (model L79031) only. Please confirm your battery model before ordering — BL310 (left side) or BL312 (right side) is printed on your original battery. The two batteries look similar but have different connector cable lengths and orientations; installing the wrong one will not reach the connector. This battery is NOT compatible with Lenovo Legion 2 Pro, Legion Y90, Legion Phone Duel 2, or other Lenovo phones. Always verify which battery you need before purchasing.

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Additional information

Model

BL310, BL312

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Frequently Asked Questions

The BL310 and BL312 batteries for Lenovo Legion Duel are two separate cells that work together as a dual-battery system. BL310 is the left-side battery, BL312 is the right-side battery. They have the same specifications (2500mAh, 3.85V, Li-ion Polymer) but different physical dimensions and connector cable lengths to fit their specific positions inside the Legion Duel's unique chassis. For Lenovo Legion Duel Pro battery replacement, you must select the correct model — BL310 or BL312 — based on your original battery. You can verify the model number printed on your original battery label. The two batteries are NOT interchangeable; installing BL310 where BL312 belongs will not reach the connector due to cable length differences. If both your original batteries are aging, consider replacing both at the same time for balanced charging performance.

Yes, this BL310 and BL312 replacement battery for Lenovo Legion Duel fully supports the original 65W fast charging. Each cell has 2500mAh capacity (9.63Wh) at 3.85V rated voltage with 4.4V charge limit. The dual-battery system (two cells working together) delivers 5000mAh total capacity. For Lenovo Legion Duel 65W charging battery performance, a fresh set charges from 0-100% in approximately 30-35 minutes — the phone intelligently splits charging current between both cells to reduce heat. For Legion Duel battery life gaming hours, expect 5-7 hours of continuous gaming (depending on title and brightness) with a new battery set. For mixed usage (social media, video, light gaming), expect 8-10 hours. The 144Hz AMOLED display and Snapdragon 865+ are power-efficient for flagship components, but demanding games like Genshin Impact or Call of Duty Mobile will draw more power. The dual-battery design helps maintain stable voltage during peak gaming loads, preventing frame drops or shutdowns that single-cell phones may experience. For Legion Duel Pro battery capacity and charging, a full calibration cycle after installation helps the system report accurate battery percentage.

Professional Lenovo Legion Duel battery installation is strongly recommended due to the complex dual-battery architecture. To replace Lenovo Legion Duel battery BL310 or BL312, the technician must: 1) Heat and remove the back cover — the Legion Duel has reinforced gaming chassis. 2) Disconnect both batteries (the phone has two separate connectors on the motherboard). 3) Remove the mid-frame bracket covering the batteries. 4) Replace the specific battery (BL310 left or BL312 right) — note that the two batteries have different connector cable lengths. 5) Reassemble carefully. For BL310 BL312 battery installation Legion Duel, improper handling can damage the dual USB-C ports, cooling fans, or side-pop-up camera mechanism. Third-party repair shops with gaming phone experience typically charge $25-45 for labor. Lenovo official repair is limited as the phone is discontinued. For Legion Duel Pro battery replacement best practice, it is recommended to replace both batteries if both are original and aging (over 2-3 years old). Mixing an old battery with a new BL310 or BL312 will cause unbalanced charging — the phone stops charging when the older cell reaches full voltage, leaving the new cell only partially charged, and total capacity will be limited by the weaker battery. For Lenovo Legion Duel battery health maintenance: 1) Use only the original 65W charger that came with the phone. 2) Avoid charging while the phone is hot from extended gaming — let it cool first. 3) Keep battery level between 20% and 80% for daily use. 4) For long-term storage (over 2 months), keep batteries at approximately 60% charge. Stop using immediately if any battery shows swelling — swollen batteries in a dual-battery phone can damage the motherboard.

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