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Get an e-bike chain or if you're stuck with 1/8" then get a legitimate track chain.
This one here seems to fit the bill? £50 tho, ffs...
https://www.wiggle.co.uk/kmc-e101-ept-single-speed-e-bike-chain
dubkev-
This one here seems to fit the bill? £50 tho, ffs...
https://www.wiggle.co.uk/kmc-e101-ept-single-speed-e-bike-chain
Doesn't need to be that expensive, but it should be 3x the price of the one currently on there.
The KMC Z1eHX Wide EPT looks appropriate to me, but I didn't look for longer than a minute. It's a question of whether the wide format fits up front where your chainring guard is. Probably will.
EDIT: I just noticed your bike is not a mid drive e-bike. You have much less to worry about. Still looks like it needs to be fixed up to be made pleasurable to ride but my whole concern about it being an e-bike with tons of torque is invalid.
bright
From a distance it looks like a 7$ chain for a kids bike. Get an e-bike chain or if you're stuck with 1/8" then get a legitimate track chain.
The slack chain is truly egregious, honestly... really. So maybe I'm being a bit judgemental, but these mid drive bikes need to be is perfect working order from the chainrings back through to the spokes. A huge amount of torque is put through them.