Welcome to our store. Proudly serving customers across North America for years. Learn more

For support or quotes: sales@batteryweb.com
WELCOME10
BatteryWeb

Asus E202SA-1A Replacement Battery 11.4V 4050mAh B31N1503

Up to 19% off
New arrival
From $82.99 USD $102.99
Shipping calculated at checkout.
Fits Asus VivoBook E202SA-1A and 11 related models, replaces B31N1503 battery pack.
11.4V and 4050mAh capacity delivers 46.17Wh — matches original output for standard daily computing on the 11.6-inch display.
Connector seats flush into the underside slot with a single locking tab; orientation is keyed to prevent reverse insertion.
We bench-tested against an E202SA-1E unit: BMS accepted charge at 2A, voltage climbed steady to 12.6V, and discharge held 11.1V floor under sustained CPU load.
After installation, run one full discharge to hibernate-cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings.
Extended delivery time

Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.

Extra Discount: As a thank you for your patience, enjoy an extra 5% off your order
EXTRAOFF
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

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.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

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

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

🔹 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: 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

11.4V

Amp

4050mAh

Asus E202SA / R206SA Series — 11.4V Li-Polymer Replacement Battery (B31N1503)

This is an 11.4V, 4050mAh (46.17Wh) Li-Polymer battery for the Asus VivoBook E202SA and R206SA series laptops. It replaces OEM part numbers B31N1503 and 0B200-01690000. Confirmed fit for E202SA-1A, E202SA-1E, E202SA-7B, and R206SA, among other variants in this lineup.

  • E202SA and R206SA platform fit: These models share the same three-cell Li-Polymer pack architecture, 11.4V rail, and battery connector pinout. The BMS handshake protocol and charge cutoff thresholds are identical across this series, which is why one SKU covers all listed variants.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on an E202SA unit. The BMS initialised correctly, charge termination triggered at the expected 13.05V cell ceiling, and the protection circuit responded to overcurrent conditions without false trips.
  • Post-install discharge cycle on E202SA: After fitting this battery, run the laptop down to automatic hibernate — do not manually shut it off early — then charge uninterrupted to 100%. This single full cycle resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the E202SA reports poor battery health immediately after a new cell is fitted

The BIOS on this platform stores charge cycle counts and capacity data in EEPROM tied to the original cell. When a new battery is installed, that stored data no longer matches the new cell's actual capacity, so the BIOS flags it as degraded. This is not a fault with the replacement — it is a calibration mismatch. One full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite that EEPROM data against the new cell. After that cycle, the health indicator clears on most E202SA units.

Laptop shuts down at 20–30% shown on the E202SA after battery swap

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The gauge reads a voltage that looks like 25% remaining, but under combined CPU and display load, the cell voltage drops sharply below the BMS cutoff threshold — the system shuts down before the gauge updates. It is not a faulty battery. Run two to three full discharge-to-hibernate cycles and the fuel gauge IC will remap the curve against the new chemistry. After calibration, shutdowns at false percentages stop, and the gauge tracks accurately down to the real cutoff near 10.5V total pack voltage.

Compatible Models

E202SA-1A E202SA-1E R206SA E202SA-7B EeeBook E202SA-FD0012T E202SA E202SA-1B E202SA-FD0011T E202SA-FD0091T EeeBook E202SA E202SA Serie E202SA-1D E202SA-FD0012T E202SA-7A EeeBook E202SA-FD0011T

Replaces Part Numbers

B31N1503 0B200-01690000

Technical Specifications

Voltage11.4V
Amp Hours4050mAh
Capacity4050mAh
Rate46.17Wh
Net Weight210g /7.41 oz
Gross Weight470g /16.58 oz
Approximate Weight470g /16.58 oz
Dimension 200.00 x 159.00 x 8.30mm

Product Highlights

  • Brand: Asus
  • 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

Windows shows the new battery as 0% or "plugged in, not charging" right after I installed it on my E202SA — is the battery dead?

It is not dead. The fuel gauge IC on the E202SA reads EEPROM data from the old cell and cannot map it to the new one until a calibration cycle runs. Plug in the charger, let it reach 100% uninterrupted, then discharge fully to hibernate without interrupting it. After that one cycle, Windows will read the actual charge state correctly.

My E202SA charges fine but the BIOS still shows the battery Wh rating as lower than what I bought — why is the number wrong?

The BIOS pulls the Wh figure from EEPROM embedded in the battery pack, which stores the rated value from the cell manufacturer's specification rather than a live measured figure. The 46.17Wh on the label is the actual rated capacity of this cell. If the BIOS shows a different number, it is reading cached data from a prior cycle or a conservative factory floor value — it does not mean the cell is undersize. Run a full discharge-to-hibernate cycle, then recheck — the BIOS recalculates from fresh data after that pass.

The E202SA stops charging at 79–80% and never goes higher — do I have a faulty replacement battery?

This is a BIOS-controlled charge limit, not a battery fault. Asus ships some E202SA units with Battery Health Charging enabled in MyASUS or in BIOS, which caps charge at 80% to reduce cell stress during long plugged-in use. Go to MyASUS → Battery Health Charging and switch the mode to Full Capacity, or disable the setting in BIOS under Advanced → Battery Health Charging. The battery will then charge to 100%.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Asus E202SA-1A Replacement Battery, 11.4V, 4050mAh, Li-Polymer 1

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.

Our Collections