A 90-liter spray tank won't get you through Part 137

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The T100 dual-battery configuration carries a 90-liter spray tank. DJI says two batteries can increase hover time by 50 percent at the same payload compared with the single-battery configuration. That is a manufacturer comparison, and actual endurance will move with payload, temperature, wind, application rate, and route design.

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The operational appeal is straightforward: more liquid per sortie and less charging pressure can reduce ground turns over large acreage. The economic result is not automatic. Chemical mix, refill logistics, battery inventory, field access, swath planning, and weather windows decide whether the larger system improves acres per day.

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In the United States, a loaded aircraft above 55 pounds does not fit ordinary small-UAS Part 107 operations. Dispensing chemicals can also require an FAA Part 137 agricultural aircraft operator certificate, aircraft exemptions or approvals, state applicator credentials, and compliance with the product label.

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That makes regulatory planning part of the buying decision. Start with the intended crop, material, loaded weight, and state, then identify the federal and state approval path before choosing the aircraft. A capable spray system without the operating authority is expensive inventory, not a business.