My car's keyless entry remote seems to be damaged, as it now eats up batteries in just 1 day. It's a very old remote and I was just thinking if it can be replaced by a new one?

Is there any option like that? I mean instead of changing the whole kit, along with motors etc, use the same with a newer remote?

Kindly guide me if I should go for a new kit instead?

How much will it cost?

Thank you in advance.