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@Jon.
so my cheap, super-bright SSC-P7 doesn't like the cold, which tends to be a problem for something primarily used at night, in winter.
Anything below 5°C and when I switch it on it flickers through random settings for a second or so then switches off. Usually if I repeat this a load of times it warms up and starts to work properly.
Is it likely to be the battery pack or the head unit? I've heard of drastically reduced battery life in the cold, but not this.