Batteries are shipped at 20-25% with cells effectively disconnected from electronics (shipping/sleep/hibernate mode) to reduce further discharge during shipping. Cells will still discharge over time and 2 years plus time from mfr to your hands is an excessively long time when starting out at 25%.
You can try allowing it to charge for an hour under close supervision but it sounds like they're permanently dead.
I almost killed my P3 batteries leaving them alone for several months. If I tried powering on, I'd get one LED, but would not stay on. A minute on charge would still be one LED, but would stay on. Showed 27%. Battery details indicated "self-discharge in storage" in red, but flew OK.
I was able to clear the red notice by fully charging, allow auto-discharge, charge back up and power on twice. I still get 18 minutes of flight time out of them.
You can try allowing it to charge for an hour under close supervision but it sounds like they're permanently dead.
I almost killed my P3 batteries leaving them alone for several months. If I tried powering on, I'd get one LED, but would not stay on. A minute on charge would still be one LED, but would stay on. Showed 27%. Battery details indicated "self-discharge in storage" in red, but flew OK.
I was able to clear the red notice by fully charging, allow auto-discharge, charge back up and power on twice. I still get 18 minutes of flight time out of them.
