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#26 (permalink) | ||
Apple
Join Date: Jan 2005
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typically, cheaper batteries tend to become unbalanced more easily than Name Brand or High End Battery packs, although I have had high end packs do it as well. Packs have a higher tendency to become unbalanced when run too low also. I set my cutoff point to 3.2v per cell in the speed control in my cars. You can also get a "LiPo alarm" that plugs into the balance leads of the battery pack. The alarm will sound when the battery drops to a preset level. LiPo battery packs are rated at 3.7 volts per cell, and either wired in series "S" or in parallel "P" So a 2S pack is rated at 7.4 volts, 3s at 11.1, and so on. a 2P pack would still be rated at 3.7 volts, and you would add together the amperage of the cells instead of the voltage.
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#29 (permalink) | |
Apple
Join Date: Jan 2005
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Yes. there are some that still use Lithium-Ion, and Lead Acid batteries, but more and more have changed over to LiPo, because they are lighter than Lead Acid and have a higher output rating, meaning "Burst" or "C" rating.
Note: there are two different "C" ratings: one is the charge rate, which is anywhere from 1-5 C, and there is the Burst rating, which relates to the short term high output of the battery. I have one 2S 4200mah battery that is rated at 75C, which means it can put out 315 Amps at 7.4 volts for a short period of time.
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#30 (permalink) |
Registered User
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If you intend on not using the lipo for several weeks/months/years, Charge the battery using the "Storage" setting on your charger (If it has such setting), then put them into a lipo bag, metal box on something metal or less prone to damage incase they catch fire. The battery still needs to be maintained even while storing them, they discharge overtime and will puff up or worse catch fire.
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#31 (permalink) | |
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Join Date: Oct 2006
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I know you can get ICR and IMR chemistry li-on cells and the IMR ones are supposedly safer, is there something like that for the li-po packs? |
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#32 (permalink) | |
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#33 (permalink) |
The Piratenite
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How reliable are current name brand cordless tool batteries that stay on maintence chargers ?
I have several always on the charger in the garage. Would putting them in a metal container be a prudent super safety guy move ? Fwiw.... I had a chicom flashlight burst into flames while sitting on my toolbox a few weeks ago. It was I inavertentatly left on and and placed face down.
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#34 (permalink) | ||
Apple
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Sort of: Lithium Ion has been around for 100 years, LiPo was invented in the 70's as an offshoot of Li-Ion. LiPo has a higher output, and more flexible form factor, sue to the construction of the density of the battery. Losi makes a "Smart" LiPo, but the cost is about 4x what a regular LiPo costs. Supposedly, LiFePo4, or Lithium Ferrite Phosphate, which is used in full size electric cars, is supposed to be the next thing coming. I don't know much about them though.
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#35 (permalink) | ||
Apple
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that doesn't mean they are perfect, but they are a lot safer than standard LiPo packs we use in r/c or in the custom flashlight hobby. Keith may disagree with that though, since his house in Lincoln burned down from a faulty DeWalt battery and/or charger.
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#36 (permalink) | |
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but I check individual cell voltages using the taps and charger before charging. FWIW bulk charging a lipo and not balancing it will only charge it to about 90% capacity. my shit is all oversized, so it's not a big deal, but if you want maximum performance, balance charge. I also rarely discharge below 40% capacity, so my packs generally stay pretty well balanced.
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#37 (permalink) | |
The Piratenite
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![]() Hmm. Not digging my new Milwaukee lithium tools quite as much now. Looks like I will add fire resistant metal cabniet to my shopping list. ![]()
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#38 (permalink) | |
Pirate4x4 Addict!
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Quote:
![]() Wish there was a way to rebuild 'em. ![]()
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#39 (permalink) |
Pirate4x4 Addict!
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Meh, I wouldn't worry about it.
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#40 (permalink) | ||
Apple
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FWIW, in the 20-odd years that I've worked with cordless power tools on an almost daily basis, I've only had one battery fire, and that was a nimh pack. I've had several pack failure with my r/c cars over the years, both nimh and LiPo. There are a lot more safety measures built into power tool batteries. I would assume that is because it is a much larger industry, so there is much more money to be lost.
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#41 (permalink) | ||
Apple
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There is. It's just a little Diode sized sensor that pops. The Makita center down in Sacramento used to repair them.
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#42 (permalink) |
The Piratenite
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Intellectually I agree, odds are remote. However I have lost 99.5% of my worldly possessions once in my life and the .5% that I didn't lose just happen to be in my garage, it's insured but I would be distraught to lose that .5% after what it took to hold on to it and what it represents to me. It's symbolic or sentimental jibberish but I'd rather spent $200 on a fire cabniet then let it naw at me.
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#43 (permalink) | |
Wut?
Join Date: Jun 2003
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My suggestion, dump the LiPo and go with other batteries. Sure they don't hold as much charge but don't have the issues LiPo have.
As I said in the Lance thread, I collected all my LiPo's and tossed them, 9 of them, in the trash, I am done with them and will never go back. Also remember the Li-ion batteries they use in most tools, are not LiPo and do not suffer from the same issues
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Last edited by Overbear; 01-05-2016 at 09:58 AM. |
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#44 (permalink) | |
The Piratenite
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My last RC battery caught fire a few years ago and I never replaced it. Gave the car away in fact.
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#45 (permalink) | ||
Wut?
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#46 (permalink) |
Registered User
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I will def be changing the way I charge mine
![]() but for all of you who are saying "I tossed mine in the trash" I hope you mean that you recycled them, if not you are pretty much doing more harm than the idiots that wheel off trail or in illegal areas ![]()
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#47 (permalink) | ||
Apple
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Good Point. instructions on how to neutralize a lipo battery for disposal. http://www.rctoys.com/pdf/thunder-po...-batteries.pdf you can also take them to some hobby shops and they will dispose of them for you.
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#48 (permalink) | |
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![]() I own industrial-strength Milwaukee power tools. And I took advice from a buddy/shop owner: "If you're a homeowner/weekend warrior-type, corded power tools are perfectly fine and ranks high on the K.I.S.S. list." BTW; Your ![]() ![]()
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#49 (permalink) | |
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Mine seem to be auto resetting? I've charged them from being badly discharged (without putting shorting clips on one, it's not going to go to 0% anyways), and I've had them refuse to charge because they were hot/cold. All of them charged, sometimes you had to reset them on the charger after a minute or two.
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#50 (permalink) |
The Piratenite
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So educate us, What are the ramifications of throwing a battery in the trash ?
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