I have a f450 quadcopter
Parts-3000mah 40c orange lipo
2213 935kv emax motors
30a emax esc
Dji nazalite autopilot with m8n gps
10*4.5propellers
Fs i6 transmitter. I have made  80 successful flight with this quadcopter. Today when i fully charged my lipo with imax b3ac charger it shows 4.25,4.20 and 3.96.i think my lipo is retired. But I have heard that average lipo pack gives almost 150-200cycles. Their is no puffing on my lipo it looks like normal. I am confused is it charger problem or battery issues?

And also my quadcopter is rock solid in wind free environment. A gentle breeze is enough to wobble my copter. I think this is propeller problem,switching to 9*4.5 or 8*4.5 may overcome this problem.I have also upgraded the naza lite to v2 firmware 

4.25V is pretty high for a cell. And the poor balance may be due to the IR or the charger.
Try using a different balance charger.

Also, check the IR at the balance leads.

B3AC is not a very good charger. I don't recommend that charger at all. Your battery is still safe and you can continue using it.

Whenever you are charging your lipo with B3AC try to check the lipo voltage at the end of charging time and stop charging when you find that it reads 12.55 ~ 12.6v on your multimeter so that it won't overcharge your lipo. I had similar experience with B3AC charger previously.

However there is a slight chance that the readings are wrong. Error is quite common in cheapos.

Please try to use professional chargers for longer lipo life.

use imax b6 its good charger b3 is not reliable charger

B3 is comparatively cheaper, and it's bought mostly by beginners, and people who don't intend to invest a lot of money in the hobby.
But when you grow beyond, it's time to move forward, and get a better charger.

What about turnigy lipo charger? I think it will be the best option. When i fully charged the battery with b3ac charger the multimeter shows 12.5v. 

Well it should sum up to only 12.41V (4.25,4.20 and 3.96), I suggest you get a good charger.

Yeah, turnigy is good. But consider that's mostly used by many. Like Bala has mentioned ISDT chargers, and they are quite good, as well.
Else, consider the skyRC B6 original. It comes for around 2k.

I suggest you to go for icharger best of all charger and set lipo terminations at 4.1v to have longer battery life.

What you need is a good charger- PM me your number, I have an extra.

Quote from: sankhasubhra1 on February 16, 2018, 08:33:16 AM
And also my quadcopter is rock solid in wind free environment. A gentle breeze is enough to wobble my copter. I think this is propeller problem,switching to 9*4.5 or 8*4.5 may overcome this problem.I have also upgraded the naza lite to v2 firmware  

for such motors with 935 kv, you can use bigger props. because if you use less dia props, you are probably underpropping your motor and might not be able to get the max out of it.
generally, the convention is, for 1000kv or around that we use 10" props, and you mentioned the motor to be 2213 size so a pitch of 4.5 or even 5 would suit.
so I'd suggest 1045 props. and I don't think the wobbling is because of propeller problem. just check if your arms etc are really tight. and not just swinging and make sure everything is really tight and no clearnaces.
even then if it is wobbling in a breeze, then i suggest tuning the I term in the PID settings. try increasing it if it seems low.