LiPo Awareness
#196
Roadrunn3r, people with damaged/bad lipo's soak them in saltwater. i have only heard of this.
#197
Originally Posted by bvoltz
I do not support these as they are not in a case... But that is not for me to decide....
http://www.maxamps.com/products.php?cat=54
http://www.maxamps.com/products.php?cat=54
#200
Tech Adept
Hey Mr Black. I first would like to thankyou for all this great info.My questions are if you say that NIMH are faster, why? and for how long in a 5 minute race? I'm assuming that you are comparing a freshly peaked nimh to the lipo.Thanks. Dan.
#201
NiMh are only faster at the beginning of a run and only with certain Motor sizes due to the resistance both internal as well as external that NiMh cells have.
The curve of a NiMH is like an arch going down steeper and steeper from the first second. A LiPo has more of a straight slanted slope so within the first minute or two the NiMH begins to show less voltage then the LiPo.
For some people speed is measured before the first lap so for them it is safe to say a NiMH with 6 cells that tops out at close to 9.6V volts delivers more power and a LiPo that tops out at 8.4 delivers less. However it is not that black and white as LiPo have less internal/external resistance (this is why NiMH get so hot, that is power being wasted) and can deliver that power more freely.
Think of it like a garden hose hooked to a bucket. if both batteries are the same capacity then the LiPo has a bigger hose where the NiMh has a smaller hose giving it more pressure but this creates leaks as it flows which wastes water.
The curve of a NiMH is like an arch going down steeper and steeper from the first second. A LiPo has more of a straight slanted slope so within the first minute or two the NiMH begins to show less voltage then the LiPo.
For some people speed is measured before the first lap so for them it is safe to say a NiMH with 6 cells that tops out at close to 9.6V volts delivers more power and a LiPo that tops out at 8.4 delivers less. However it is not that black and white as LiPo have less internal/external resistance (this is why NiMH get so hot, that is power being wasted) and can deliver that power more freely.
Think of it like a garden hose hooked to a bucket. if both batteries are the same capacity then the LiPo has a bigger hose where the NiMh has a smaller hose giving it more pressure but this creates leaks as it flows which wastes water.
#202
Tech Adept
Thankyou Mr black. I've got a MRC 989 on its way. Can it balance a 2 cell lipo some-what without buying an extra balancer. I mean threw the Pos and neg power wires only, by reducing its charge rate as it's about to peak. Dan.
#203
Originally Posted by danimal1965
Thankyou Mr black. I've got a MRC 989 on its way. Can it balance a 2 cell lipo some-what without buying an extra balancer. I mean threw the Pos and neg power wires only, by reducing its charge rate as it's about to peak. Dan.
#204
Originally Posted by or8ital
Late night? Any pictures?
#205
Tech Master
iTrader: (10)
Hey guy, this is a very informative thread and I was hoping I could get a question clarified. I've just recently purchased a Duratrax Ice and hope to pick up a lipo in the next couple of mnonths. I race Sliver can and stock and 19t occasionally. My question is: What capacity pack do I buy as I have read that you should never go below 80% discharged? My local track runs 6 min. stock and 7-8 min. silver can (TC), would the team orion 3200 meet these needs. Thanks--Al
#206
Originally Posted by big al
Hey guy, this is a very informative thread and I was hoping I could get a question clarified. I've just recently purchased a Duratrax Ice and hope to pick up a lipo in the next couple of mnonths. I race Sliver can and stock and 19t occasionally. My question is: What capacity pack do I buy as I have read that you should never go below 80% discharged? My local track runs 6 min. stock and 7-8 min. silver can (TC), would the team orion 3200 meet these needs. Thanks--Al
#207
A friend wants to go flying tomorrow. I pulled out a couple of 3 cell lipo packs that were fully charged when I put them away last October. One took around 5 minutes to repeak, and the other took around 8 minutes. This is at a 1C charge rate. Shows they really hold their charge. Just try that with a nimh. It will be interesting to see if they have degraded run time or not from sitting for 5 months.
#208
Here's a picture of my charging gear that I use to race with. I alternate between two of the Carbon LiPo packs, only one of which is shown. This is all you need to race and be competitive with LiPo. Therein lies one of the main reasons it's so attractive to many of us.
#209
Originally Posted by syndr0me
Here's a picture of my charging gear that I use to race with. I alternate between two of the Carbon LiPo packs, only one of which is shown. This is all you need to race and be competitive with LiPo. Therein lies one of the main reasons it's so attractive to many of us.