I've a Bugs 5W quadcopter. Its one year old. During the winter it was resting on the shelf. (The battery was charged). When I started to fly again the flight time was approximately 3 minutes. I bought new batteries, but the problem is the same! Any idea? Thanks in advance!
Maybe silly question but you make sure the new batteries were fully charged and are they the same exact ones that it came with in the first place?
Also I don't have a bugs quad but does yours have brushed or brushless motors? If brushless the rotor (rotating can part on outside) will have air gaps and can see the coils inside the motor, if a brushed motor typically just shiny silver can on outside of motor that doesn't spin and just the shaft spins. I ask because brushed motors have about a 6 hour runtime life and will start to wear down pretty quick after they have exhausted their lifespan and will get really weak power or short flight times as they die. Brushless motors will last basically forever or until the bearings supporting the shaft wear down at least.
Only other thing to mention is cold batteries won't work as efficiently nor will really hot ones you want them around room temp for ideal operation.
First of all thanks for your reply! It's the brushless version and the new batteries were the same as the original. Finally I modified one of the battery frame to be able to connect a standard XT60 connector. I connected a brand new 2 cell same capacity battery and the result was the same. Maybe I didn't store the battery well 'cause it was fully charged, but when I bought the new batteries the flight time was also three minutes.
Hmm gotcha yah if changed the connector would maybe double check the solder on that make sure it is a good connection (not a possible cold solder get the whole bullet and wire going into it molten) maybe even over do it, as is you might have a high resistance connection that is bleeding off power as heat. Guess another thing to check is that the motors spin pretty smooth by hand, should feel the "notchiness" from the magnets in there but otherwise should spin smooth and without any grinding noise (funk stuck between the coils and magnets or funk in the bearings from water/mud could reduce efficiency as well, or something else physical like a pretty bent prop). Also flight time can vary a lot depending on how much ascent you're doing or basically how much the throttle is being used to fight wind or climb. I usually get somewhere between 5-8min on my 5" with 4S 1300mAh to 1550mAh batteries (no go pro so my rig is pretty light just a runcam and the essentials ).