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Not clear what @ArfurPill bought, a "di2 groupset" may or may not include it.
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A di2groupset comes with a charger no?
The bikes over bought came with a charger.
Yup standalone purchase comes with a charger. http://www.wiggle.co.uk/shimano-ultegra-6870-di2-11-speed-groupset/?lang=en&curr=GBP&dest=1&sku=5360755276&kpid=5360755276&utm_source=google&utm_term&utm_campaign=UK_PLA_Components&utm_medium=base&utm_content=mkwid%7CsCvofmgqz_dm%7Cpcrid%7C67090789142%7Cpkw%7C%7Cpmt%7C%7Cprd%7C5360755276uk
You need the shimano charger. It should have really come with the charger. Unless it explicitly said it didn't.