3 years charging these lipo battries and no problem. 8-16-2013 my luck ran out.
I was charging a 3 cell 2200 mah lipo while I worked at the computer.
It caught FIRE near me. Got it out the door just in time.
It burns HOT and long.
I was charging a 3 cell 2200 mah lipo while I worked at the computer.
It caught FIRE near me. Got it out the door just in time.
It burns HOT and long.
Could have burned the place down to the ground.
Be CAREFUL.....PLEASE !
Be CAREFUL.....PLEASE !
Earl
It Caught FIRE near me. Got it out the door just in time. It burns HOT and long.
Be CAREFULL.....
Be CAREFULL.....
Comments
Good discussion.
IIya, the thing about the voltage cutoff, is that it is better to destroy the battery, than to destroy the battery AND the quad. Using the low voltage cutoff will usually cause the quad to crash, as invariably one of the ESC's will reach LVC before the others. However, this does not mean that we fly with no LVC at all. The key is to use telemetry, or a voltage failsafe auto-land. You should land when voltage gets low, don't keep flying until it won't fly anymore. That's not what it's about to disable the LVC in the ESC's.
Now, the perennial question is: How low is too low?
I typically fly until the in-flight hover voltage is 3.5V/cell. This typically results in a post-flight at-rest voltage of about 3.7-3.8V/cell. This seems to be nice. I normally put back the typically recommended 80% of the stated capacity.
However, sometimes, I've gone past 3.5V accidentally, even to as low as 3.0V/cell. It can sometimes drop VERY fast once it gets past 3.5V which is why it's pretty pointless to do this anyway. But as I say, sometimes it happens. I wonder how much damage I do when this happens?
i have some Unused reputable phone company batteries that i made into 3S batts for powering ground equipment. These batteries cut out internally at 3.5V as over discharge protection. They take 1200mAh of charge from that voltage (classed as 1200mAh). You can really see that the phone companies are not going outside that range. Also if you try and pull large current they have over current protection, and cut out.
We don't do any of that in RC, and people, without using telemetry or low voltage audio alarms are simply over discharging, and pulling more current than the battery can handle. You probably only have 100 to 150 charge cycles (maybe less)before you need a new battery.
I think it really important to see how much charge your batteries are accepting (not whats written on side;-)), and not pulling out more energy than you put in. You will then maximize the finite<\b> lifetime.
I charge my lipos on a glass table, on our deck. For storage, I place the batteries in fire proof bags, then into a steel ammo box, and last, in the fireplace.
It is stories like this that keep me doing what I have been doing. For me, it is easy to get careless and over confident at times. - Not safe.
Thanks.
BLEVE?
My wife gets annoyed when I talk about rapid deflegration vs. detonation, when we watch something on TV or a movie. One needs to get ones terminology straight, and too often the entertainment industry gets it wrong. HAHA!
I guarantee you any firefighter since that event occurred has seen this video somewhere in their training's.
Here = hear...ugh autocorrect.
MLK Jr...I here ammonium perchlorate, and all I can think about is this:
And what you have with a LiPo, It sounds to me at least, is a rapid release of over pressure of an element which can react very violently. The element being oxygen. See my above statement for more detail regarding oxidation.
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