I discovered an old camera (canon powershot a3300 is if it helps) that i stopped using about 8-10 years ago. I lost the battery charger but found one online that i could buy. Just wanted to know if its still possible that the battery works or if i should also buy another battery.
Just wanted to know if its still possible that the battery works or if i should also buy another battery.
Yes, and yes.
Yes, it's possible that the battery still works -- I've been able to charge original batteries from my circa 2005 Rebel XT after they've sat for years, although the performance isn't nearly as good as new. But you won't really know unless you try it.
And yes, you should buy another battery if you plan to use the camera. Third party NB-8L batteries that fit that camera are cheap -- you can find kits with two batteries and a charger for as little as $13 including shipping. So it doesn't make a lot of sense to buy a charger alone and hope that your 10yo battery is still in good shape. Buy a kit that includes a charger and at least one new battery, and if the old one happens to still take a decent charge then you'll have one more spare.
It depends on whether it is second-source or original. Second-source batteries tend to save on materials in quality and quantity, leading to quite higher self-discharge rates and self-corrosion even in storage.
In contrast, storing original Li+ based batteries at about half-charge in a reasonably cool and dry place tends to be comparatively benign. After all, original batteries are planned with a potential quite higher stock and shelf life than typical second-source batteries are, and the effects of storage after light use are not all that much different from before it.
The usual life of Li-ion batteries is only two to five years, even if they are sitting on a shelf unused. For this time batteries discharge (if not in use) from self-discharge current and they can't be reactivated. The situation can become worse if the place where you store them is hot.
For more information you can check for example here.
IMO will be better to buy new battery, I saw them on Amazon for less than 15 USD
Sometimes they survive such long storage, sometimes they do not. Fact is, practically all rechargeable Li-Ion packs that are sold to the general public and can be installed without tools have a trapdoor circuit inside that permanently disables the battery once it reaches deep discharge. The exception might be dodgy third-party packs. Leaving that circuit out, or defeating it (there are tutorials on the web suggesting overloading that circuit to fuse it short - DON'T!), is not a feature but criminal madness - attempting to charge that battery risks blowing it sky high.