Some people have had battery problems - a dealer should replace a bad battery under warranty.

 I've had 3 Yaris hybrids and never had a problem as an occasional user. 

If you're the worrying type, you could get a jump-starter such as this one:
https://www.amazon.co.uk/NOCO-GB20-UltraSafe-Lithium-Gasoline/dp/B015TKPT1A

I’ve heard a lot of bad reports regarding flat batteries

12v battery problems

Yaris

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