The website looks legit, and the delivery time is much better than Alli Express. Please let us know how this order goes. If the battery arrives when promised and lives up to the specs, I will be tempted to try this new alternative to Ali...
You have raised a very important point about securing the battery for each flight. I learned from others in this forum that all batteries used by the Mavic 1 Pro and Mavic 2 Pro MUST be secured with zip ties, and this rule applies to the stock...
Still on the fence whether to get the 7700 or 12800. Does the M1P behave very differently with either ? It must make a big difference compared to the stock batteries !
Did you secure them with the velcro and rubberbads as show on the AE listing ?