What makes lipo's so good and fast?
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What makes lipo's so good and fast?
Hey all. Decided to join an r/c forum finally and found this is an active one. Did a little searching but didin't find any section on batteries and decided to post this. My question is lipos are fast and good, but what makes them fast and good?Sure they don't get a memory and are light weight, but beisdes wouldn't they still be similar to nimh?Let's take 2s and3s lipos only in this example. A 2slipo is still 7.2-7.4 volts just like a 6 cell nimh.
My other question is if a lipo doesn't get a memory, why bother discharging ever?Why not just keep on recharging over and over?
Thank you on any help.
My other question is if a lipo doesn't get a memory, why bother discharging ever?Why not just keep on recharging over and over?
Thank you on any help.
#3
RE: What makes lipo's so good and fast?
They have higher power density for their weight. A LiPo has about double the capacity for its weight when compared to an equivalent NiMH pack.
They also act as a stiffer current source, so when you hammer the throttle, it just goes faster instead of pulling the pack voltage down under load.
They also have a great shelf life. No need to keep topping them off all the time.
They also act as a stiffer current source, so when you hammer the throttle, it just goes faster instead of pulling the pack voltage down under load.
They also have a great shelf life. No need to keep topping them off all the time.
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RE: What makes lipo's so good and fast?
Thanks, and what about the discharging part?They don't get memory and can last up to a year w/o being recharged again. So why discharge at all?
Oh, and i can't wait to try out my lipo, had it since saturday but my charger won't be here till this wensday. Ehh, no racing for me today.
Oh, and i can't wait to try out my lipo, had it since saturday but my charger won't be here till this wensday. Ehh, no racing for me today.
#6
RE: What makes lipo's so good and fast?
there is volts, and then there is amps. lipos put out more amps(in general) compared to a nimh pack of the same voltage. doing so while being lighter!
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RE: What makes lipo's so good and fast?
ORIGINAL: redfisher1974
You dont have to discharge them.
You dont have to discharge them.
hope this illuminates
Steve
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RE: What makes lipo's so good and fast?
The reason lipo's put out more power is that they have much lower internal resistance compared to nimh/nicad cells. That not only allows you to draw more power from them but it gives you more usable power as opposed to it being wasted as heat. Thats why you will get longer run time from a Lipo of the same Mah as a nimh even though your faster as well.
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RE: What makes lipo's so good and fast?
ORIGINAL: krone6
My other question is if a lipo doesn't get a memory, why bother discharging ever? Why not just keep on recharging over and over?
My other question is if a lipo doesn't get a memory, why bother discharging ever? Why not just keep on recharging over and over?
"My question is lipos are fast and good, but what makes them fast and good?"
Elemental chemistry?
They're just much more developed. Lithium ions have a very high difference in electrochemical potential, and both the ions themselves, as well as the polymers used to contain those ions are lightweight and space-efficient. Lithium cells do have to be manufactured in a more controlled environment, so they were expensive at first. But now volume manufacturing and cutting out the middleman has in some cases made Lithium ion batteries cheaper than the Nickel-metal hydride ones.
They're not at all similar to NIMH, the only real similarity is that they are both batteries. LiPo and brushless motors together are what was required to get electric RC trucks similar or exceeding performance to nitros and other fuel-powered RC trucks, so naturally some of the sanctioning bodies like ROAR tried to make that technology illegal so that it did not pose a threat to nitro. All they did was manage to hold back the revolution by a few years. Today 1/8th scale electrics aren't uncommon and in the coming few years, we'll see consumer systems marketed toward 1/5th scale and up.
BTW when people talk about things like 'internal resistance', 'voltage', and 'current carrying / load' this is a statistic or measurement of performance. Those things aren't "what makes it better", they are simply measurements that show they are better. What makes it better again is the design, the chemistry, etc.
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RE: What makes lipo's so good and fast?
Didin't think anyone would post after the questions were answered but all the better. Access's and dock's posts really became clear on why lipos are so much better.