How to Winterize a DJI Agras T100 or T25P: Off-Season Storage Checklist

Season's over. Before your T100 or T25P goes into the shed for the winter, spend an afternoon on it. Chemical left in the lines, water left in a pump and batteries parked at full charge cause most of the spring "it won't spray" and "the battery won't hold charge" calls we get.

This checklist follows the storage and maintenance sections of DJI's T100 and T25P user manuals, which match almost word for word, plus what we see in the shop. Always check the manual for your specific aircraft.

1. Flush the spray system (the most important step)

Clean the aircraft after it has cooled down, not right after the last flight. DJI's cleaning steps:

Fill the tank with clean or soapy water and spray it out through the sprinklers until the tank is empty. You can also use the Clean Hose function in the spray settings in the DJI Agras app.
Repeat until the water runs clear. For the end of the season, we suggest at least three rinses.
Pull the spray tank strainer (the mesh filter where liquid leaves the tank) and clean out any buildup. If it's torn or caked, replace it.
Handle the rinse water per the pesticide label. Most labels say to apply rinsate (the used rinse water) to a labeled site or dispose of it according to local rules. Don't dump it at the shed door.

Last product was a wettable powder (a dry product mixed into water that tends to settle out) or something that tends to settle? Add an extra rinse with a tank cleaner the chemical label allows.

2. Get every drop of water out

DJI's storage guidance says to make sure no liquid remains in the tank, flow meter (the sensor that measures how much liquid you're spraying), pumps or hoses before long-term storage. In Utah and the Mountain West, this isn't optional. Water that freezes in a pump housing or flow meter can crack it.

Remove or empty the spray tank.
Run the pumps briefly with the tank empty to push out remaining water, then stop. Don't let them run dry for long.
Disconnect hoses at the low points and let them drain.
Let the system air dry in a heated or dry space for a day before storing it.

3. Clean and inspect the nozzles

The T100 and T25P use centrifugal sprinklers. Wipe the centrifugal disks (the spinning plates that break liquid into droplets) clean and check for buildup or wear. DJI's maintenance list calls out "poor atomization" (liquid not breaking into even, fine droplets) as a sign the disks need a thorough clean or replacement. If you saw an uneven spray pattern late in the season, now is the time to sort it out, not in April.

T100 owners thinking about the 4 Nozzle Mist Kit for next year can install and test it over the winter.

4. Wash and dry the airframe

With the battery removed and the aircraft fully assembled, you can rinse the body with water. DJI suggests a low-pressure spray washer and a soft brush or wet cloth. Wipe motors and propellers with a damp cloth if they have dust or chemical residue, then dry everything off. Don't pressure-wash straight into motors, connectors or the radar (the obstacle and terrain sensor).

5. Do the 100-flight inspection

DJI recommends maintenance every 100 flights or 20 hours of flight time. Most spray drones are well past that by fall, so do it now:

Check propellers for cracks, chips and worn edges. Replace any that are damaged, along with their washers.
Check for loose propellers and frame bolts.
Look for aging or cracked plastic and rubber parts, including tank seals and hose fittings.
Replace the spray tank strainer.
Check arm locks and landing gear for play (wiggle or looseness).

Order replacement parts in the winter so you're not waiting on them when the season starts. T100 owners can find propellers and other parts on our site.

6. Store batteries at 40–60%

This is the one that costs people money. The T100 uses the DB2160 battery and the T25P uses the DB800. DJI's guidance for both:

Store batteries at 40–60% charge. Don't leave them full or empty for the winter.
Store between -20 and 40 °C (-4 and 104 °F) in a dry place. In practice, a room that stays above freezing and out of direct sun is ideal.
Fully charge and discharge at least every three months. Put a reminder on your calendar for January.
Keep batteries off concrete floors and away from heaters, fuel and anything flammable. Don't stack things on them.
Wipe the terminals with a clean, dry cloth.

If you aren't sure which battery goes with which aircraft, our Agras battery compatibility guide covers it.

7. Don't forget the remote controller

The RC has its own battery. DJI says to discharge it to 40–60% for extended storage and to charge it right away if it ever hits 0%. A remote that sits dead all winter can be damaged by over-discharge (the battery draining below a safe level). Wipe the screen and body with a damp cloth, not chemicals.

8. Generators, chargers and the mixing station

Generator: Follow your generator manual for off-season storage. That usually means stabilizing or draining fuel and changing the oil.
Charger: Blow out dust and check the cables and plugs for damage.
Mixing equipment: Flush and drain your mixing station and hoses the same way as the drone. Any water left in pumps or flow meters can freeze.

9. Store it right

Fold and secure the propellers.
Store it clean, dry and covered, ideally in a heated or insulated space. A drone cover keeps dust and mice out.
Keep the batteries separate from the aircraft.
Make a note of anything that needs fixing so it isn't forgotten by spring.

10. Use the off-season wisely

Export your flight data and records through the DJI Agras app or DJI Assistant 2 (DJI's desktop software) before you forget.
Update firmware once a stable release is out, and check for any new DJI Agras app version.
Renew licenses, Part 107 recurrent training (the FAA's free refresher course due every 24 months) and insurance now, before the busy season.

Need parts or service?

We're a local DJI Agras dealer, and we can help with parts, batteries and repairs during the off-season. See why buying local matters for support. For the T100, T25P, DB2160 batteries or a C10000 charger, call 1-877-992-8279 or email sales@avarydrone.com.

Sources

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Winterizing Your DJI Agras: Off-Season Storage Checklist for T100 and T25P