well from what I see it's a zte phone without wifi or fast charging
it's about 3 years old regardless of how long you had it as stores will try to sell out their older stuff if they can
even at 3 years old it should hold at least a 94% charge
now...when you remove the battery is it perfectly flat or does it look expanded?
your pins are working if it's charging and it's a slow charging phone (as in 6/7 hours)
I'm guessing you're trying to use it while it's charging which it's a no no...
that phone won't charge faster than you can use it
it can support 12h of talking time with the screen off on 3g and about 8h on LTE
and it's sold for about 120 bucks which is at the trash level of smart phones
if you're looking for a smart phone on the lower budget side I suggest taking a look a xiaomi phones as they're great value for pricing
redmi note 11 5G
is a relatively cheap phone around $200-250 with 8gb ram / 128/256gb storage using the latest ufs2 FS
with a 50mb resolution camera and a 16mb for that selfie with the tank
the battery is 5k mah which is almost double the capacity you have on yours
it supports fast charging which I'm sure is something you'd appreciate (using it while it charges)
also it's worth mentioning that xiaomi sells older phones at a higher price in australia
as it can be seen on their website:
www.mi-store.com.au
which also lists them ALL as
sold out
it's cheaper and more worth for you to get the note 11 at let's say 250 and pay for the extra shipping for australia than buying an older one like the note 8 at $379 inside Australia