I think it's essential that everybody involved in anything "RC" should fully understand about Lithium Polymer batteries (Li Po) and just how DANGEROUS they can be.... there have been many house fires due to Li Po batteries going on fire so please read all about them VERY carefully.
Yes, it's no joke Ian and VERY important that you follow the rules when it comes to Li Po batteries. Don't be one of the "it won't happen to me" brigade and return home to find your house burnt to the ground. These batteries can KILL you (and your family) so always make sure you charge them on a flameproof surface and NEVER leave them charging unattended.
Don't charge them on a pile of newspapers and go off to bed for the night...... these vids and warnings are not jokes, they are SERIOUS warnings.... people have DIED in fires caused by LiPo batteries.
I've made this thread a "sticky" because I think safety is always paramount in whatever you do and we don't want anybody getting their fingers burnt (or worse).
Mike, the other thing I'm finding is the weight distribution is not always the same as well. I don't know about you, but the trimming needs to be checked every time you change battery.
It can be only slight, but it's there!!
In the bigger ones, it's really crucial because the batteries are much heavier.
The real BEAUTY of the the Nine eagles is the fact that the battery "click locks" into the cradle so is ALWAYS in the exact same place.... to remove it you simply pull the tab on the battery and out she pops.
The MCX2 cradle can loosen over time and the batteries can actually move slightly in the cradle.... what I have done is mark a red line on all my batteries and I push the battery in until the red line matches up with the bar on the battery holder so there is no real need to retrim every time you replace a battery as they are always in the same position.
With the longer miniaviation batteries you basically trim with the turnigy batteries.... fit a miniaviation (which is a longer battery).... if it is out of trim, land the copter and move the battery slightly... take off again and keep adjusting the "battery" until she flies smooth..... then mark a line with a red permanent marker....
Do this with all your batteries and trimming is pretty much a thing of the past when you replace the batteries.... it's not as involved as it sounds and is actually quite logical when you think about it
I stupidly left a battery running in the MSR last night when I had to make a phone call and forgot about it. Today it was stone dead and wouldn't charge.
My first thought was - that's it. Gone past the 3v danger bit so it's now dead.
I tried it in the 120 sr charger which gives pulses and slightly upped the amp rating on the charger. It charges at 0.7 amps for the 120 and the MSR charger is at 0.3. I stuck it on 0.4 since it gives the choice and suddenly the battery was being pulsed and it charged. I then used it and it was fine.
Are pulse chargers better to use?
Also, does it hurt to pulse at higher amps to get a quicker charge, or is it best to leave it at 0.3?
The 120 sr charger is rather nice and it can be altered up or down depending on the battery. They recommend 0.7 for 500 MaH batteries. I suppose a lower amp rating would lengthen the life of the battery?