After hundreds of hours playing assualt I just discovered this. I can revive teammates at full health and killing enemies with the defib has never been easier. Who knew
who knew
Like, everyone.
I didn’t know you could kill enemies with the dfib. 
The expert assault assignment requires 10.
Do they have to be low health at full charge? Or is a one shot full charge?
One shot full charge should be good
Helpful tip, if you know you’re about to get stabbed when you have the defibrillators out, charge them. Your player reacts and shocks him when he stabs you.
If really everyone knew and used it, there is a good chance that op could have been killed by someone using the defib and learn about it from that. I happened to learn about it same way but clearly it’s not used so much
I always make a point of giving 100% unless it’s in a safe place and the timer to revive has nearly ran out.
The number of times i’m moving in to give someone a full revive and some joker jumps in and gives a quick revive in front of my nose is disturbing.
This is what I have started doing now that I know you can charge it. People tend to survive better when they have 100% health versus 20%.