Aliexpress are a bit like ebay but much bigger, I have had no issue with any of the many purchases I have made via them. Three or four times I have been refunded with no quibble.
If you had gone with the Li-on UK one then you may have had other expenses for new controller etc if they didn't play ball.
The Aliexpress seller claim a full refund if your doesn't arrive by June 6th, most stuff via Aliex arrives within 14 - 21 days. Don't forget you may have to pay import duties of about £30 - £50 after it arrives, the courier usually sends an invoice within a fortnight if there is any to pay.
If you had gone with the Li-on UK one then you may have had other expenses for new controller etc if they didn't play ball.
The Aliexpress seller claim a full refund if your doesn't arrive by June 6th, most stuff via Aliex arrives within 14 - 21 days. Don't forget you may have to pay import duties of about £30 - £50 after it arrives, the courier usually sends an invoice within a fortnight if there is any to pay.