And there's no in-pack overcharge protection, or balancing -- to get that, you need the right charger and you need to set it up correctly.
Fortunately, that market understands that batteries will burst into flame occasionally, and deals with it.
-- www.wescottdesign.com
I just had lunch with a friend that's into RC anything that flys.
Todays flying machinery really sucks power out of a LiPo battery pack. I haven't measured mine, but it's many amps. Some battery packs are rated to as high as 30C. That's 30 times the rated amp-hr battery capacity for 1 hr. I'm using a cheapo 2600 ma-hr 11.1v battery which will fly for about 15 minutes. That's: 2.6A * 60min / 15min = 10.4 Amps That is why quadcopters use fat cables and big connectors. There are plenty of battery protectors and BMS (battery management systems) that will work. The problem is that the operating current and the shut down thresholds are very close together. I guess the melt down and explosion thresholds are also fairly close to the operating current. Add protection, and then have it kill the power with the quadcopter at a few hundred feet, is not a good thing. So, they do without the protection.
Overcharge protection would require a coulomb counter to count the number of electrons that pass through the charger and into the battery. Most any other method is subject to errors, especially as the battery begins to age, with the various cells in the pack aging at different rates. It could be done, as it's currently being done in laptop and removable smartphone batteries, but that would raise costs and issues with using "approved" batteries.
Most quadcopters above the level of a toy have the JST connector provided for a balance charger. I bought my quadcopter cheap because the balance charger originally supplied by the vendor destroyed several batteries before the owner realized what was happening. Instead of replacing all his batteries and the charger, the former owner sold it to me. Of course, he didn't tell me about the problem, so I destroyed about $25 in batteries before I realized what was happening. The original balance charger was replaced by one from SkyRC, and I'm living happily ever after.
Tell that to the product liability attorneys, who appear out of the woodwork whenever one of those occasional explosions appear, ready to make America great again by suing everyone involved for grievous damages and endangerment. The market understands, but the courts do not.
-- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
The pack then either contains a serial number that the charge controller can read, or isn't user replaceable.
Have a look for burn proof charging bags
Not married? I wouldn't have guessed
Congrats and quite impressive. The average among my aquaintences is about the same as the age of their kids when they are evicted.
Ask you wife what she might do if you were in the habit of:
Some nerds (such as me) are too weird or wild to be successfully domesticated.
-- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
"How dangerous are LiPo batteries? || Overcharge, Overdischarge, Short Circuit" (5:19) Oddly, some of the protection devices didn't work as expected. No explosions or major fires.
-- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
I have no interest in doing that
I etch PCB's in her oven
Not in the pantry but in a storage closet alongside her appliances, crock pots, electric skillets, etc
No
No antennas
Sounds interesting >:-}
Nope
No tree suitably big enough here in the desert, but sounds like fun.
I was recently accused of that by the HOA because I only drive the pick-em-up truck every few weeks. I'm now considering running for the HOA board >:-}
In the past.
You just need to find someone tolerant. I've worked at home since
1973... apparently some women can't even cope with that. ...Jim Thompson-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 |
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