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United Kingdom, England, Ware
Joined Aug 2012
168 Posts
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Lipo c ratings
Not intending to start a "Which is the best Lipo" or preaching to the converted but recently purchased a new lipo rated 50C and I was doubtfull regarding the claim .
I think we are all aware that the C rating is always in question as the manufacturers never states as to how they arrived at the figure . Posted an question on the battery forum where ended up getting a PM from a very informative fellow who it turned out has done extensive testing of lipo performances . Gave me a good basic insight and directed me to this Excel sheet http://www.jj604.com/LiPoTool/ A simple entry of the cells internal resistance or IR gives the actual C rating. By use of a watt meter , fixed load of a vehicle head lamp bulb and Ohms law arrived at the IR of some packs . Results were disturbing where the recently purchased branded 5000ma 50C pack was only actual at 22C Splashed out on a dedicated meter that gives accurate total pack IR along with individual cell IR Again discovered some packs where they were showing a balanced voltage but cells within the pack having very differing IR readings .Start to load up the pack the cell with higher resistance will heat up doing more damage . Refering back to the tool I played around a bit with a range of differing IR readings where for the pack rated at 5000Ma 50C the cell resistance would have to be in the region of 0.5 Ohme . Not rocket science to see that is virtually impossible so in the future I will be passing on any packs rated 50C and perhaps work on max of 30c . Am reliably informed there is a new player in the lipo market by the name of Haiyin where a few of the electric flying lads have been getting excellent results. There is a UK stockist ,Electriflyer, currently with a small range of soft pack but expanding the range with hard pack so perhaps will be giving those a try Jim
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Just thought Id share. Working on my Ryan Villopoto replica based on Round 1 of supercross. He was wearing new "Thor core phase coil" gear thats pretty tricky, in other words a real pain in the arse to replicate. Looks a little sloppy up close and colors (red especially) not a good match. Wish I had an airbrush. Just need to finish details on this guy and I can move on to stickers for bike and then Im done maybe next week.
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Yeah, well, actually the black and white are Createx brand from 2yrs ago. I went back this year and Michaels sells this Spectre brand now. Seems even more watered down then Createx. It takes a long bit of time because its like reverse order of painting a body, so if you want bright colors you have to have a white background. The deegan rider foam is so the outside skin of deegan where the red is has a waterproof like resistance to paint not experienced like I had with the vmx rider, so it took a few coats of paint jut to cover it up. Paint is thin so I wish I had an airbrush to really see if that method takes less time and less paint to get good results. So far black is the only color that covers in like 1-2 coats easy without a watercolor look to it, all other colors so far take more coats. Nice thing is it dries fast.
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Awesome mate ![]()
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