Battery Voltage

My 48V Homie battery shows only the red light. When I first charged it, one of the green lights didn't illuminate after charging and it showed 50.+V.
After 5 total miles ridden the display showed 46V.
The charger is putting out 25 volts and the battery illuminates only the red light. I'm not sure how to use the voltmeter on the battery as there's more than 2 contacts.
See the attachments:


https://photos.app.goo.gl/cFYMhQENezYuYVBj9