S6 Wireless charger

Been looking for a spare charger for work and the s2 one is about £25.

Was in a retailer who had the s6 wireless charger £25 on a display stand tried my s7 which worked then thought try my s2 which worked perfectly soon as I dropped it on the charger.

In the past heard people say the s2 won't work with.

I bought one direction from Amazon works fine on everything except my s2, wondering if it's fake or the charger doesn't always work with the s2.

Anyone tried it on there s2 ?

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