My first phone was also second-hand, kinda a hand-me-down phone, because it's a phone that my uncle gave me because he had bought a new one. Unlike yours, the battery is fine, but the screen was really full of scratches, and its casing looks like it would fall off in any second. It lasted almost 2 years with me until I replaced it with a new one. It's still functioning, tho, but it's really laggy now.
Your experience in buying a second hand phone was quite unfortunate because I somehow suspected that Daddy David knew that the phone really had a battery issue, but of 'course the call of moneymaking was more important, so I guess he took advantage of your need for a new phone. Anyway, I'm glad that you finally bought something that really satisfied you. Thanks for sharing, @kingsleyy.
Good day.