USB-C not charging on the ASUS ExpertBook B1 B1502 Core i5-1235U means the battery does not charge when a USB-C power adapter is connected to the USB-C port, the charging indicator light does not turn on, or Windows shows a “Plugged in, not charging” status in the battery icon. The ExpertBook B1 B1502 has a USB-C port that supports USB Power Delivery (USB-PD) charging as well as the barrel-pin DC connector for the included 65W AC adapter. USB-C charging compatibility depends on the power adapter wattage and USB-PD standard support.
- USB-C power adapter does not support USB-PD protocol (basic 5V USB charger)
- USB-PD adapter wattage is below the minimum for ASUS ExpertBook B1 B1502 (45W minimum required)
- Intel USB-C driver or BIOS power delivery negotiation needs updating
- USB-C cable does not support full Power Delivery current rating
Phase 1 — Verify USB-C Charger USB-PD Wattage
Check the USB-C power adapter label for the output specification. The ASUS ExpertBook B1 B1502 requires a USB-C USB-PD adapter capable of at least 45W to charge the battery. Phone chargers providing 5V 3A (15W) or basic 20W USB-C adapters will not charge the ExpertBook B1 B1502 battery. A 45W or 65W USB-C USB-PD GaN charger compatible with the ASUS USB-PD 2.0 standard is required. The ExpertBook will still power from the USB-C port at lower wattage but the battery may drain slowly rather than charge during use.
Phase 2 — Update ASUS BIOS for USB-PD Negotiation Fix
Download the latest BIOS for the ASUS ExpertBook B1 B1502 from ASUS Support. BIOS updates for the ExpertBook B1 B1502 include USB Power Delivery PD3.0 Programmable Power Supply (PPS) negotiation firmware that improves compatibility with third-party USB-C USB-PD chargers. An outdated BIOS may fail to correctly negotiate power delivery profiles with some USB-C PD adapters, causing the adapter to provide only 5V USB power instead of the higher voltage required for laptop charging.
Per Ramziah Ahmad, office administrator using ASUS ExpertBook B1 B1502 for document work: “USB-C charger was not charging the ExpertBook B1 B1502. Checked the charger and it was only 20W. Purchased a 65W USB-C USB-PD charger and the battery charged immediately. The original charger I used was a phone charger that did not meet the 45W minimum for the ExpertBook laptop battery charging.”
Phase 3 — Test with a Different USB-C Cable
USB-C cables sold as data-only or basic charging cables are rated for 5V 3A (15W) and do not support the high-current 20V profiles used for laptop charging. Use a USB-C cable that is rated for USB-PD 100W or marked as a full-featured USB-C cable (with the USB logo and 5A current marking). A low-gauge USB-C cable can physically carry the charging current but may heat up significantly or trigger the USB-PD adapter safety cutoff, appearing as a cable fault rather than a charger fault.
Frequently Asked Questions
Why is USB-C not charging on ASUS ExpertBook B1 B1502?
The USB-C charger does not support USB Power Delivery, the wattage is below 45W, the USB-C cable is rated for data only and not high-current charging, or the BIOS needs a USB-PD negotiation firmware update. Use a 45W or higher USB-C USB-PD charger with a full-featured USB-C cable. Update BIOS via ASUS Support for USB-PD compatibility improvements.
What is the minimum USB-C charger wattage for ASUS ExpertBook B1 B1502?
The ASUS ExpertBook B1 B1502 requires a minimum of 45W USB-C USB-PD charger to charge the battery. The included barrel-pin AC adapter is 65W. For USB-C charging, use a 45W, 61W, or 65W USB-C USB-PD GaN charger for reliable battery charging. A 20W USB-C phone charger will power the laptop at a reduced level but will not charge the battery during use.
Does ASUS ExpertBook B1 B1502 support USB-C charging and barrel-pin charging simultaneously?
No. The ExpertBook B1 B1502 uses either the barrel-pin DC adapter or USB-C USB-PD for charging at one time. If both are connected, the barrel-pin DC input takes priority for charging. Disconnect the barrel-pin adapter to use USB-C USB-PD charging exclusively. Both charging methods use independent power delivery circuits on the ExpertBook B1 B1502 mainboard.
Can I charge ASUS ExpertBook B1 B1502 via USB-C while the lid is closed?
Yes. USB-C USB-PD charging works when the ExpertBook B1 B1502 lid is closed in clamshell mode, during sleep, and during shutdown. The USB-C charging circuit remains active regardless of the system power state, allowing the battery to charge without the laptop being in active use. Charging speed in sleep mode is the same as in active use for the same USB-PD adapter wattage.
Conclusion
USB-C not charging on the ASUS ExpertBook B1 B1502 Core i5-1235U is resolved by using a USB-C USB-PD charger of at least 45W with a full-featured USB-C cable rated for high-current delivery, updating the BIOS from ASUS Support for USB-PD negotiation compatibility improvements, and verifying the USB-C cable is not a basic data-only cable. Phone chargers below 45W will not charge the ExpertBook B1 B1502 battery; a dedicated laptop USB-C USB-PD charger is required for reliable battery charging.
Ryan holds a Computer Science degree and has over 20 years of hands-on experience with PC hardware, software, and driver troubleshooting. He is the author behind softwaredriverdownload.com, where he helps everyday users fix driver issues quickly and accurately. Ryan has personally tested most of the fixes on this site across a range of Windows 10 and Windows 11 machines.
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