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It's a 12V gel battery about 150mm long - standby battery for an alarm system, 'rescued' from a skip at work. Normally I'd use a mains adapter, but it happened to be on the bench at the time.
The lens was needed for use with my previous phone - a Nokia slide (2200?) with limited capabilities: nailing an additional lens in front made enough of a difference.
Current phone is an elderly Galaxy A10 - as far as I know, it doesn't have a macro mode. Will investigate Mrs. E's (newer) phone and report back...
MrE
That's some proper MacGuyver shit! 😀
Two questions: