Like how the hell do you aim them well? Even point blank I can’t hit a window. Let alone something at distance. They always fly off target and are slow to through. You can’t aim for long because the game is very fast paced. Are the grenades useless at the moment or is there a trick to them? I saw in the past there was a trajectory marker that showed where it will go. Why was that removed?
When you throw them, the left hand thumb is a good indictator where with will land, I saw this tips on loading screen, it works! 
unfortunately, there aren’t many tips that i could give.
but, you can actually try it on the pratice game mode. it allows you to throw grenades and make a pratice 
although, i suggest you to cook them for a few seconds before throwing them. so that AI/players will not be able to throw them back.
and mind that grenades are affected by player movement. you are not accurate when you are moving. also keep in mind the middle screen. most of the time it lands there.
press G for a quick throw
Grenades usually go in an arc right off, so put the window you’re aiming at in the top 1/3 of your screen and it should go right in no problem.
Thanks for the tips all! Will practice and follow the left thumb rule as suggested
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Can’t believe you need to see this manual on how to use hand grenades…
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The longer you hold it, the longer it cooks off, until it reaches a point will it auto throws and will blow up when it lands.
I personally, cook it off for a second or two, then run like hell to put as much stuff between me and where it lands.
Detpacks I cook for 5 secs then throw under tanks kaboom!
3 sir
I count to 5 as well, the fuse seems to be 6.5-7 seconds. Don’t want that Puma scurrying away
Also the blast radius is terrible they are a waste of time, the explosives are better, but i know they said they are going to nerf the explosives but if they do they need to improve the nades