IPhone icon says not charging but battery is going up?

My iPhone 5 is not showing the charging icon but the battery percentage is going up a little bit each say twenty minutes or so.
has this ever happened to anyone before?
I brought the charger in a shop for about twelve, thirteen pound. Fairly cheap.

Should i get a new charger or continue using this one?

Some chargers work so slowly that the iPhone doesn't recognize it, but it's still charging anyway. If you want a faster, more reliable charge, get a better charger.

Mine does that. I have still been using it and nothing is wrong with my phone

It just means that the charger is not powerful enough for the iPhone to recognize it's really charging. It's fine.

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