Camera not turning on after few years of no use

i recently bought a used canon powershot sd 750 from ebay and am unable to turn it on. the seller indicated that the battery had been dead since 2019 so he had not used it since then, but it was in good working condition once the battery gets charged.

i bought my own charger and charged the battery but the camera still does not turn on, anyone have advice? should i just try charging it for longer? should i buy a new battery? does it matter that the battery has not been charged since 2019?

let me know!