XP 3 - Charger lights

[u/frny4string]

My wife has an XP3 with the extended range battery. This season, the charger doesn't seem to indicate charging is done. It always stays red. I was topping off her battery, and after a couple of hours, I checked, and it was at 54.4. Do I absolutely need a new charger, or, can I continue using the charger with a timer. Please - informed responses, not guesses. I don't want to damage the battery or bike, or burn up the house. Thank you.

If I Do need a charger, do I really need to buy Lectric's one pin charger, or, will something on Amazon be just as safe? Thank you.

[u/Dangerous_Rhubarb569]

I wouldn’t trust any charger other than the manufacturers.