Hello, it sounds like there could be a couple of potential reasons for the rapid loss of charge in your Power Sonic PS-12550U battery. Firstly, check the connections to ensure they’re secure and free from corrosion. Loose connections or corrosion can cause inefficient charging and discharging. Secondly, assess the battery’s age and usage. If it’s been in service for an extended period or subjected to frequent deep discharges, it may have reached the end of its lifespan and require replacement. Additionally, consider environmental factors such as temperature extremes, as extreme heat or cold can negatively impact battery performance. If you’ve ruled out these factors and the issue persists, it’s advisable to consult with a professional technician for further diagnosis and potential battery replacement.