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It turns out that the sets of battery operated fairy lights at Poundland have an extra feature not mentioned on the packaging. The way it's been implemented is "economic" but still seems OK.
I also used a couple of 10 ohm quarter watt resistors to convert a 120 LED string for USB use. The current is about 100mA which is quite bright and high enough to keep most "intelligent" USB powerbanks awake. This USB mod will work for most parallel LED strings that don't have the two-wire multi-channel effects (two channels relying on polarity reversal).
For higher intensity you could use a single 10 ohm resistor, but it would need to be rated at about 1W to keep cool. Likewise you could get longer run time at lower intensity by using higher resistor values noting that if the current is too low some powerbanks will switch themselves off. Not a problem with a cheap simple powerbank or a mains USB adapter.
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