The ASUS ExpertBook B1 B1402 is a business-class laptop powered by the Intel Core i5-1335U, designed for reliable daily use. If your ExpertBook is charging very slowly — taking six or more hours to reach full charge — or barely gaining charge percentage while in use, there is a clear path to diagnosing and fixing the problem.
Common Causes of Slow Charging
- Using the wrong charger — the ExpertBook B1 B1402 requires a 45W or 65W adapter; a 5W phone charger will not charge it effectively
- Battery Health Charging mode enabled — MyASUS limits charge to 80% to preserve battery longevity
- Charging while under heavy CPU load — sustained workloads can consume power faster than the charger replenishes it
- Degraded battery — batteries lose capacity over time and charge more slowly as they age
- Dirty or damaged charging port — debris or corrosion in the DC-in port reduces charging speed
Fix-by-Fix Solutions
Use the Official Charger
Always use the 45W or 65W ASUS barrel charger that came with the ExpertBook B1 B1402. Third-party USB-C chargers may not supply the correct voltage and current for fast charging on this model.
Check MyASUS Settings
Open MyASUS > Customization > Battery Care. If Battery Health Charging is set to Balance or Maximum Lifespan Mode, switch to Full Capacity Mode temporarily to test charging speed.
Charge While Off or Sleeping
The fastest way to charge is while the laptop is shut down or in sleep mode. This eliminates CPU power draw and lets the charger focus entirely on the battery.
Check Battery Condition
Open Command Prompt as administrator and run powercfg /batteryreport. Open the generated report and compare Design Capacity vs Full Charge Capacity. Capacity below 70% of design means the battery may need replacement.
“My ExpertBook B1 B1402 was charging from 20% to 100% in eight hours — way too slow. The culprit was MyASUS set to Maximum Lifespan Mode capping at 60%. Switched it to Full Capacity and charge time dropped to 2.5 hours.”
— Siti Norzahra, administrative officer
Clean the Charging Port
Power off the laptop and use a soft, dry toothbrush or a can of compressed air to clean any debris from the DC charging port. Dust and pocket lint can interfere with the metal contacts and reduce charging efficiency.
Update BIOS
Visit the ASUS Support page for the ExpertBook B1 B1402 and install the latest BIOS update. BIOS updates often include fixes for power management and charging behavior.
Frequently Asked Questions
Ryan holds a Computer Science degree and has spent over 15 years troubleshooting Windows hardware and driver issues across major laptop brands. He writes practical, step-by-step guides for everyday users at softwaredriverdownload.com.
What charger does the ASUS ExpertBook B1 B1402 use?
The ExpertBook B1 B1402 uses a 45W or 65W DC barrel charger. It does not natively support USB-C charging on all variants. Check the original charger included in the box and replace it with a genuine ASUS charger of the same wattage if lost.
Why is my ExpertBook B1 B1402 not charging past 80%?
MyASUS Battery Health Charging feature limits the charge to 80% in Balance Mode or 60% in Maximum Lifespan Mode to extend battery life over time. Open MyASUS and switch to Full Capacity Mode if you need a full charge.
How long should it take to fully charge the ASUS ExpertBook B1 B1402?
With the original charger and the laptop in sleep or off mode, the ExpertBook B1 B1402 should charge from 0% to 100% in approximately 2 to 2.5 hours. Longer charge times indicate a battery, charger, or settings issue.
Can a third-party charger damage the ExpertBook B1 B1402 battery?
Using a charger with incorrect voltage can potentially damage the battery over time. Stick to ASUS-certified chargers or reputable third-party adapters that match the exact voltage and wattage specifications listed on the original charger label.
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