Hi JediDoc,

Thanks for sharing the battery report. After reviewing the telemetry and recent capacity changes, a few things stand out:

• On July 25th, your battery’s full charge capacity dropped from 50.6 mWh to 32.2 mWh, and design capacity plunged to 37.5 mWh. That’s a 38% overnight loss—highly irregular for standard lithium-ion wear.
• On July 26th, the report shows no telemetry data at all, which often means the EC couldn’t read the battery’s EEPROM correctly.
• Your BIOS version (V1.26, March 21, 2025) is up to date, so the issue isn’t firmware-related.

The symptoms suggest your battery might be refurbished or aftermarket:

• Sudden non-linear capacity drops
• Charge LED functioning, but Windows failing to register power
• Design capacity and firmware inconsistencies breaking EC communication

If that’s the case, OS and BIOS may block telemetry or charging attempts to protect the EC. These issues can’t be fixed by software—they’re hardware-level failures.

💡 Also, if your Nitro ANV15-51 is less than a year old and you’re the original owner, you might still be eligible for a battery replacement under Acer’s warranty. It’s worth contacting support with your SNID and a copy of the report.

Before trying any flash or recalibration work, I’d recommend replacing the battery with an OEM-compatible unit. Here’s a link to a verified replacement battery: Genuine AP21D8M Laptop Battery for Acer Nitro V 15 ANV15-51 AN16-51 5 AN515-58 | eBay

Let me know if you want help checking the battery’s firmware strings or filing a support request with Acer.