Lenovo Legion Y740-17ICHg 15.36V Replacement Battery 5B10Q88556
Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.
EXTRAOFF
Check that your old battery model number and device model to match our description. This makes sure they work together.
We ship your order same day if you buy it before 4 PM EST.
Lenovo Legion Y740-17ICHg 15.36V Replacement Battery 5B10Q88556 - is backordered and will ship as soon as it is back in stock.
Let customers speak for us
Send Your Battery Photo
Expert Technician Help
Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.
POST YOUR BATTERY IMAGE
Product & Solutions Expert
✉ sales@batteryweb.com
Battery Care Tips
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
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
⚠️ 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.
Lenovo Legion Y740-17ICHg 15.36V Replacement Battery 5B10Q88556 - is backordered and will ship as soon as it is back in stock.
Voltage
15.36V
Amp
4800mAh
Lenovo Legion Y740 / Y730 Series — 15.36V Li-Polymer Replacement Battery (L17M4PG2)
This 15.36V, 4800mAh (73.73Wh) Li-Polymer battery replaces the original cell in the Lenovo Legion Y740 and Y730 17-inch gaming laptops. It covers OEM part numbers including L17M4PG2, L17C4PG2, L17L4PG2, L17S4PG2, and 5B10Q88556, among others. Confirmed fit includes the Y740-17ICHg, Y740-17IRHg, and Y730-17ICH series.
- Legion Y740 / Y730 17-inch platform: These models share a 15.36V four-cell Li-Polymer architecture with a common BMS handshake protocol. The connector pinout and communication lines are identical across the Y730 and Y740 17-inch variants, which is why one cell covers all of them.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a Y740-17 unit. The BMS negotiated correctly, charge current stepped down cleanly at 95%, and the fuel gauge IC accepted the new cell data without flagging an error state.
- Post-swap BIOS recalibration: After installation, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after swapping a new cell into this platform.
Laptop shutting down at 20–30% shown after battery swap
This happens because the Legion Y740 runs a combined CPU and discrete GPU load that draws heavy current bursts during gameplay or rendering. Under that load, a partially calibrated cell hits a voltage cliff earlier than the fuel gauge predicts, and the BIOS triggers an emergency shutdown. The fuel gauge IC is reading state-of-charge from a model built on the old cell's discharge curve. Run two complete discharge-to-hibernate and full-charge cycles — this forces the gauge IC to rebuild its curve against the new cell, and the premature shutdowns stop.
BIOS reporting battery Wh rating as wrong after installation
The Wh value shown in Lenovo Vantage or Windows power settings reads from EEPROM data embedded in the BMS, not from the physical cell. When a replacement cell carries EEPROM values from a slightly different production batch, the reported Wh figure may not match the label. This is a data field mismatch — it does not affect charging behaviour or actual capacity delivered. Check the actual charge held via a full cycle; if the laptop runs as expected, the discrepancy is cosmetic only.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Lenovo
- 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
Why does Lenovo Vantage show "poor battery health" or 0% immediately after installing a new cell?
The health status in Vantage reads from EEPROM data written by the original battery's BMS — the new cell starts with no learned history, so the software flags it as degraded or unreadable. This is not a fault with the replacement cell. Run one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100%. That forces the BIOS battery learn cycle to reset and Vantage will update the health status on the next boot.
The fuel gauge is jumping around — showing 60%, then 45%, then 70% within minutes. Is the battery faulty?
The fuel gauge IC on the Legion Y740 platform estimates state-of-charge using a model calibrated to the old cell's discharge curve. When a new cell goes in, that model is wrong, so readings oscillate until the IC gathers real data. It is not a cell fault. Complete two full discharge-to-hibernate and uninterrupted charge-to-100% cycles — the IC rebuilds its curve and the gauge stabilises within 48 hours of normal use.
New battery stopped charging at 80% and won't go higher — is the cell defective?
No — this is a BIOS-level charge limit, not a cell fault. Lenovo ships the Legion Y740 with a Conservation Mode setting active by default in Lenovo Vantage, which caps charging at 60% or 80% to reduce cell stress during continuous AC use. Open Lenovo Vantage, go to Power → Battery Settings, and switch from Conservation Mode to Normal Mode. Charging will resume to 100% immediately.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Related Products
Engineered for Performance. Built to Last.
Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.
-
Up to 19% offNew arrival
BatteryWeb
Lenovo Yoga 9 14ITL5 Compatible Battery 15.52V 4700mAh
1.13 lb
Sale priceFrom $98.99 USD Regular price $121.99Unit priceVery low stock (6 units) -
-
Up to 19% offNew arrival
BatteryWeb
Lenovo ThinkPad P16s Replacement Battery 15.48V 5B10W51869
1.07 lb
Sale priceFrom $98.99 USD Regular price $121.99Unit priceIn stock (18 units) -
-
Up to 19% offNew arrival
BatteryWeb
Lenovo Legion 7 16IAX7 L21C4PC2 Compatible Battery 15.44V
1.32 lb
Sale priceFrom $98.99 USD Regular price $121.99Unit priceIn stock (48 units) -
-
Up to 19% offNew arrival
BatteryWeb
Lenovo ThinkPad X13 Yoga G2 Compatible Battery 11.52V 4500mAh
1.08 lb
Sale priceFrom $98.99 USD Regular price $121.99Unit priceIn stock (51 units) -
-
Up to 19% offNew arrival
BatteryWeb
Lenovo L21D2PG1 Tablet Replacement Battery 7.68V 3750mAh
0.59 lb
Sale priceFrom $83.99 USD Regular price $103.99Unit priceIn stock (57 units) -
-
Up to 19% offNew arrival
BatteryWeb
Lenovo ThinkBook 14 G4+IAP L21M3PD7 Replacement Battery 11.52V
1.1 lb
Sale priceFrom $88.99 USD Regular price $109.99Unit priceIn stock (51 units) -
-
Up to 19% offNew arrival
BatteryWeb
Lenovo ThinkPad P1 Gen 4 5B11B79217 15.48V Replacement Battery
1.32 lb
Sale priceFrom $98.99 USD Regular price $121.99Unit priceIn stock (42 units) -
-
Up to 19% offNew arrival
BatteryWeb
Lenovo ThinkPad P16s Replacement Battery L21D4P72 15.4V
1.05 lb
Sale priceFrom $88.99 USD Regular price $109.99Unit priceIn stock (42 units) -
