kirksansom
I'm returning to the hobby after 21 years and am especially new to electrics and lipos. There's ton's of warnings about charging lipos: charge 'em outdoors on concrete away from combustible surfaces, etc., etc. etc.
So, I purchased a couple of Lipo charging bags along with my Thunder AC680.

My question is: In module 7 of the Ultimate Training Course, Dave suggested charging at 60% of the amperage of the battery which takes longer but is better on the battery in the long run which is just fine with me.
The thing is, he says it will take 2 hours to charge at 60% (versus 45 minutes at the battery's amperage). However, everybody says you gotta keep an eye on the battery while it's charging. If I'm charging multiple batteries, one at a time, that will consume a crazy amount of my time! This is supposed to be a hobby not a job!

Do I really need to sit for hours watching a battery charge at 60% in a lipo charging bag?

Again, I'm totally green to this part of the hobby.

Thanks for any help.

ks
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vcereijo
look up lipo fires on youtube and you'll see why all the warnings. I went to the Army Surplus and bought an ammo canister so now i basically have the charger and lipo going inside a metal box. Makes me feel better when i walk away from the setup. I also store my batteries there.
Get out the way, papa lost control.
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criznach
I say charge in a safe place outdoors, or create a safe environment to charge in with cinder blocks, etc. Then you'll have some margin for error if something does go wrong. I parallel charge 4 at a time, outside, inside lipo bags, at about 3C on my nano tech batteries, which the specs say can be charged at 10C. I always try to be where I can see them, but I definitely never leave the house while charging. In the winter I'll probably charge on the concrete garage floor, inside of a cinder block, with a concrete paver over the top. There are lots of discussions on how to make it safer. Try rcgroups.com.
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ASD
While charging in a lipo safe bag and outside and etc is probably the safest way, I charge them in my shed or in my car on the way to the field or in my house, pretty much where ever. Just pay attention to them. No u don't have to babysit them just check on them every now and then to be sure their not getting hot. If they are getting hot ur trying to charge them too fast. Yes the videos on youtube will scare the crap out you but its like anything just use common sense

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Cuz tooling around is just not my style of flying. Full stick and full travel control surfaces.

http://www.youtube.com/user/DollarTreeFlyer/videos
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kirksansom
Thanks everyone. I've seen the videos and I understand the danger, I just knew there had to be some alternatives to spending 6 hours to watch 3 batteries charge. Thanks for the suggestions. An ammo canister sounds very reasonable and doable. Cinder blocks sound like a decent alternative. I just ran across some info on parallel charging. Now, that sounds like the most sensible thing to me. I understand that the battery packs have to have the same number of cells and the voltages need to be very close but at least it turns a long, long process in to a reasonable one.
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kirksansom
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look up lipo fires on youtube and you'll see why all the warnings. I went to the Army Surplus and bought an ammo canister so now i basically have the charger and lipo going inside a metal box. Makes me feel better when i walk away from the setup. I also store my batteries there.

I really like this solution. Did you drill holes in the side for cables so you can close and lock the canister?
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criznach
I've been finding that if I always fly on the timer, my batteries are all within .1v and I'm good to go. If I forget to run the timer I may have one battery that I charge on it's own.
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JettaManDan
i've charged about 5000 lipos to date and never with a problem..yes lipo dangers are real..but if you never charge them beyond 1c you should always be fine especially if it is a balance charge.. 1c is simple..if the pack is a 1000mah pack then it is a 1 amp pack..charge it at 1amp and the proper voltage and you are safe..if the pack is a 2200mah pack then it is a 2.2 amp pack and charge it at 2.2 amps and again you are safe...as long as you match the packs capacity to the charge rate (and don't go over unless the pack is rated for it) you should never have a problem...check the pack to see if the voltage on all the cells are close 1st..and any damage to the pack before you charge it..puffed...frayed connectors...any discoloring etc...if it looks good and reads good voltage then you should be fine..i charge up to 8 lipos at a time on various chargers and all at 1C and have never had anything happen. A LIPO safe bag and 1c charge rate will keep you in good shape.

Dan
My YouTube Channel - 250+ Video's! http://www.youtube.com/jettamandan09

I'm an R/C Junkie! 40+ planes - 12 Heli's - 6 multirotors - and ground vehicles galore! I've got issues.
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kirksansom
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i've charged about 5000 lipos to date and never with a problem..yes lipo dangers are real..but if you never charge them beyond 1c you should always be fine especially if it is a balance charge.. 1c is simple..if the pack is a 1000mah pack then it is a 1 amp pack..charge it at 1amp and the proper voltage and you are safe..if the pack is a 2200mah pack then it is a 2.2 amp pack and charge it at 2.2 amps and again you are safe...as long as you match the packs capacity to the charge rate (and don't go over unless the pack is rated for it) you should never have a problem...check the pack to see if the voltage on all the cells are close 1st..and any damage to the pack before you charge it..puffed...frayed connectors...any discoloring etc...if it looks good and reads good voltage then you should be fine..i charge up to 8 lipos at a time on various chargers and all at 1C and have never had anything happen. A LIPO safe bag and 1c charge rate will keep you in good shape.

Dan

Thanks JettManDan! Gosh, I'm excited to get advice from an R/C celeb & guru. I like your YouTube vids!
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vcereijo
I have to say tha Ive yet to have a problem either and ASD is right about common sense. My thing is that everytime I walk away from my charging station (in my garage) I cant help to always be somewhat concerned about what could happen. The ammo canister gives me piece of mind.
Get out the way, papa lost control.
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vcereijo
I got lucky and found one that has a two position lid which gives me a perfect slit in the front to feed my power cord while keeping the rest nice and sealed, but the plan all along was to drill a hole...
Get out the way, papa lost control.
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squishy
I have charged more lipos that I can remember or count...I do not think charging is unsafe....unless the battery is physically damaged...Just charge the battery on something non-flammable to be safe. I use a large ceramic tile.

I do however feel they are unsafe when they hit things or the ground really fast. I have seen plenty of lipo fires because of crashes...

I have also seen plenty of lipo fires from shorting out the battery. Never ever ever short out the battery, they dump all their energy in a second and sometimes vent.

But I have never seen a problem caused by charging. There's lots of stories from people online though so I always do it safely. Just do your homework and do it right, all the stories I hear about charging accidents are from trying to overcharge, charge to fast or charge at the wrong settings...don't do that...
"Education is not about filling buckets; it is lighting fires." W.B. Yeats

http://www.youtube.com/user/squishy654
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JettaManDan
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Thanks JettManDan! Gosh, I'm excited to get advice from an R/C celeb & guru. I like your YouTube vids!


huh? celeb? me? hell no! i just set a plane on fire here once in a while !

Squishy is right...where you get into trouble is when a battery has taken a hit..has been charged wrong..the wires have been crossed etc....it is when they are mishandled and then people say "ther hell with it" and throw amps into it that you are in trouble. If the battery puffs up..if you crash a plane and the battery is ejected (happens to me) and then it is squished....or it is stepped on..or the dog takes a bite out of it...etc...then you need to be cautious or just toss the battery away after you discharge it properly and make sure it is inert.

For a healthy structurally sound pack charging is no big deal..follow the charge rates and don't push it and you will be just fine. I do recommend a lipo safe bag just to be extra safe....and make sure you don't leave the house when you charge stuff. I've never had a pack short out and catch fire (knock on wood) but i don't try to super fast charge stuff or push my packs...i have something like 100+ lipos....and never had an issue..

if you have any questions hit me up anytime here on the boards or over PM..always happy to help and give my $0.02...about all my advice is worth

Dan
My YouTube Channel - 250+ Video's! http://www.youtube.com/jettamandan09

I'm an R/C Junkie! 40+ planes - 12 Heli's - 6 multirotors - and ground vehicles galore! I've got issues.
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