Thank you for your comment, @rmm31 brother. You're absolutely right—many times we think our devices are completely damaged and end up buying new ones without realizing that the issue might be something minor. In this case, it was fortunate that the battery was in good condition, and the UPS only needed internal cleaning to function properly. Having a multimeter for troubleshooting helped identify the real problem. It's always a great tool for diagnosing electrical issues. Thanks for sharing your thoughts😊