Left in Wash, Low Battery Indicator Stuck

After accidentally leaving my Pokewalker in my pants pocket and putting it through the laundry a long time ago, it still works just fine even now, but the low battery indicator is stuck and won’t go away, even with a brand new battery inserted into the device. I suspect that a component must have been damaged, but I don’t know what the component could be, or how to replace it with this being such a compact device. Has this happened to anyone else and has it been fixed in the past?