Can I check battery health from a flight log?

Not from the formats this tool parses. Battery cycle count and cell data live in the DJI app's battery page or in .DAT logs, which are not supported here.

How many logs should I ask the seller for?

Two or three recent flights. Comparing several files makes it much harder to hide a recurring GPS or altitude problem.

Does this replace a physical inspection?

No. It is a cheap first filter that costs nothing and takes minutes, but you should still inspect the airframe, props, motors and batteries in person.

Drone Flight Report / Used drone check: read the flight log before you buy

Used drone check: read the flight log before you buy

A used drone looks identical whether it has flown ten times or four hundred. The seller's word and a clean shell tell you very little. The flight log does: it is the aircraft's own record of where it went, how hard it was pushed and whether anything went wrong. Ask the seller to export the log from the DJI app (or hand over the .bin / .ulg file from the flight controller) and run it through the analyzer before you pay.

What a log can tell you

How much it actually flew. Total distance, duration and the number of GPS points give a rough usage picture that is hard to fake consistently across several files.
Whether the GPS is healthy. A satellite count that drops below six, or long gaps in the track, points to a receiver or antenna problem that will bite you later.
Whether it was flown hard. Abrupt altitude or speed changes, and unusually high climb rates, show up in the flight-health check as flags rather than as a vague impression.
What conditions it survived. The regional wind reference adds context: a flight in strong wind stresses motors and airframe far more than a calm hover.
Whether the story matches. If the seller says "barely flown, indoor only" and the log shows 4 km at 300 m altitude, you have your answer.

What a log cannot tell you

Battery cycle count, cell balance and internal resistance are not in these logs. This tool does not certify airworthiness, and it cannot see crash damage. Use the report to ask better questions, and still inspect the airframe, props and batteries in person.

How to check a drone in five minutes

Ask for two or three recent logs, not just one. Upload each file, compare the dates and distances, and look for the same warning appearing twice. Two flights with GPS dropouts are a pattern; one is an accident. Then check that the serial number on the box matches the account the logs came from, and that the aircraft is not still bound to the seller's DJI account.

Analyze a flight log free →

Used drone check: read the flight log before you buy

What a log can tell you

What a log cannot tell you

How to check a drone in five minutes

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