Crashes are not what kills most electronics in this city. Damp is. Chennai gives you months of high humidity, a monsoon that arrives without much warning, and — if you fly anywhere near the coast — salt in the air on top of it. All three go after the same things: solder joints, connectors, and anything with exposed copper.
Corrosion is slow and invisible. It doesn't announce itself. You get an intermittent VTX, a motor that stutters under load, a receiver that browns out on a hard turn. By the time it shows up in the air, the green crust is already on the pads. That's why I conformal-coat boards on builds that are going to live in this climate — a thin protective layer over the electronics buys you years.
Rain isn't the main problem. Packing up wet is. A quad that takes a light shower and gets dried properly usually survives. A quad that goes into a bag damp does not. If you get caught out: land, disconnect the battery immediately, and don't try to "blow it dry" on the props.
Dry it properly. Battery off first, always. Then let it sit somewhere warm with air moving — a fan does more than a hot surface, and heat guns near a LiPo are a bad idea. Give it far longer than you think it needs. Overnight, not twenty minutes.
Store it dry. A sealed box with a few silica gel packs costs almost nothing and does more for your gear than any single upgrade. Swap the silica out now and then — saturated, it's just a bag sitting in your case doing nothing.
LiPos hate humidity too. Store at storage charge, in a fireproof bag or ammo box, off concrete floors and out of the damp. A swollen pack is a dead pack — retire it rather than gambling.
Wash the salt off. If you fly beach spots, salt residue is the aggressive one. A wipe-down of the frame and exposed hardware after a coastal session is worth the two minutes.
None of this is exotic. It's a coating at build time and a box with silica after. But it's the difference between a quad still flying in three years and one that develops a mystery fault every monsoon.
If you've got a rig that's been through a couple of Chennai monsoons unprotected, bring it in — a clean, re-flow and coat is a lot cheaper than a new stack.