What's the maximum capacity of MicroSD his drone scan support?

256 GB is the correct answer. You do need a fast transfer rate to smoothly transfer at 4K. One of the most reliable Micro SD cards for drones with plenty of speed is the SanDisk Extreme Pro Micro SDXC UHS-1 U3 A2 V30 Memory Card. It has a 4.8 rating and cost about $56.

If I do the math right, the mini combo w/ a extra batteries is actually more expensive than buying the Mini plus separate batteries. Comments?

Not exactly. Unless there’s a sale I’m unaware of, the MSRP on the Mini 2 by itself is $450 which includes one battery. The fly more combo includes 2 additional batteries which are $53 each. So a total of $556. The fly more combo is $600. So just buying the drone and 2 extra batteries would technically be cheaper. What’s also included is the charging bay which holds all three batteries. Which is worth the extra $44 itself (but it can buy bought online for about $35). Otherwise you have to plug the drone in every time you want to charge a battery and to charge all three, you’d have to swap each battery out and charge them one by one. The combo also includes 3 sets of propellers (which aren’t really expensive and you may never need them) and I don’t believe buying the drone by itself includes the carry case, which comes with the fly more combo. You could say that’s worth $15-$20. Which you’ll definitely want to hold everything and protect it. So if you have a case already and don’t want extra propellers, you’d maybe save money buying everything separately. But trust me, you’ll want the charging bay. The batteries run down quickly and take a while to charge. And without it, you can’t charge the other batteries while using the drone.

Can this drone fly a pre-planned grid pattern automatically over a 40 acre parcel of land?

DJI Mini 2 can perform the following pre-planned flights: Helix, Dronie, Circle, Rocket

what drone is comparable to this without geo zones?

The Autel Nano + is roughly equivalent to the DJI Mini 3 Pro. It is more advanced than the Mini 2, Mini 1, or Mini SE, just like the Mini 3 Pro. It has obstacle avoidance, and a camera which is equivalent to the Mini 3 Pro. Autel drones are widely used by first responders doing Search and Rescue missions, precisely because they do not have to waste time on geo-unlocking as they would have to on a DJI drone, when time is crucial for a rescue mission.

Package Dimensions L x W x H	18.1 x 15.1 x 13.5 centimetres
Package Weight	0.98 Kilograms
Product Dimensions L x W x H	36.2 x 25.1 x 7.2 centimetres
Item Weight	248 Grams
Brand	DJI
Colour	Grey
Included components	DJI Mini 3 ×1, DJI RC-N1 RC Cable (Lightning Connector) ×1, DJI RC-N1 RC Cable (Standard Micro-USB Connector) ×1, DJI RC-N1 RC Cable (USB Type-C Connector) ×1, DJI RC-N1 Remote Controller ×1
Part number	CP.MA.00000584.01
Size	Compact
Warranty description	DJI
Maximum shutter speed	2-1/8000 s
Style	DJI Mini 3
Effective still resolution	48 MP
Guaranteed software updates until	31 Dec. 2025

Mini 3 – Lightweight and Foldable Mini Camera Drone with 4K HDR Video, Remote Control, 38-min Flight Time, True Vertical Shooting, and Intelligent Features

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