SMC 28C 4000/5000 Hardcase Lipo part 2
11-29-2008, 04:01 AM
#1397
Btw, Danny would you take a photo of latest batch of 5000 pack? I'm kind lost on all the re-version/color-change...
11-29-2008, 07:23 AM
#1398
I think all testing should be done with a 1c charge rate. Isn't that what almost all packs on the market are rated for?
11-29-2008, 08:00 AM
#1399
I totally agree !!!
11-29-2008, 10:44 AM
#1400
Can you tell me the difference between a 1C charge rate and 2C charge rate on the packs numbers ? I can tell you it doesn't change them plus when doing tests it saves half the time. Actually our packs can handle up to 3C for charge rates but we reccomend 2C.
11-29-2008, 10:47 AM
#1401
All the latest 5000/28C packs have the same color as the single cell pack I posted pictures of in the 4000/single cell thread and the wires come out the top. We sent packs for pictures to be posted on our website.
11-29-2008, 12:16 PM
#1402
Tech Regular
iTrader: (5)
The pack finishes charging and you take it out of the heater, say, at the start of the race right before yours. Go through tech, grid and then go. I'd say a 5 to 7 minute gap. Would the advantages of heating disappear by that point?
11-29-2008, 12:31 PM
#1403
If you look at the numbers you can see the difference between 72 and 103 and 150 so if you warm up your pack and lets say you race in 10 minutes from when the pack is pulled from your heat pad it should still be warmer than if it wasn't heated.
I also think track owners/race directors shouldn't allow heating as it's one step that everybody will think they have to do and if everyone does it there will be no advantage so it's one more thing to worry about. Since tracks should be testing for over charging it would be simple to tech for heating.
I also think track owners/race directors shouldn't allow heating as it's one step that everybody will think they have to do and if everyone does it there will be no advantage so it's one more thing to worry about. Since tracks should be testing for over charging it would be simple to tech for heating.
11-29-2008, 12:47 PM
#1404
I've seen the 5000's swell slightly at temps under 150. I'd be pretty scared to try and get them up there.
11-29-2008, 12:51 PM
#1405
Danny,
Are you saying there's no difference in performance between a 1C charge and a 2C or 3C charge? And that the ONLY difference is that the packs charge up faster? Also, do you feel 2C or 3C will have much impact on cycle life of your packs?
I know of a lot of guys that are charging are very high rates because they think it's making them faster. All it really seems to do create an unnecessary risk for those of us pitting near them.
Are you saying there's no difference in performance between a 1C charge and a 2C or 3C charge? And that the ONLY difference is that the packs charge up faster? Also, do you feel 2C or 3C will have much impact on cycle life of your packs?
I know of a lot of guys that are charging are very high rates because they think it's making them faster. All it really seems to do create an unnecessary risk for those of us pitting near them.
11-29-2008, 01:15 PM
#1406
I don't reccomend heating of Lipos as it's just one more thing racers have to worry about. So it shouldn't be allowed.
I have heard of some packs swelling when heating them but I think that could be caused by charging them while there being heated or maybe the heating pad is creating more heat as it's touching the case. All my heating tests were don on an oven. I have went as high as 180 with no issues but once again this was only for testing and I don't reccomend it. The goal with my post is to show that Lipo numbers can easily be changed so we need to take this into account when looking at and trying to compare numbers.
11-29-2008, 01:21 PM
#1407
Danny,
Are you saying there's no difference in performance between a 1C charge and a 2C or 3C charge? And that the ONLY difference is that the packs charge up faster? Also, do you feel 2C or 3C will have much impact on cycle life of your packs?
I know of a lot of guys that are charging are very high rates because they think it's making them faster. All it really seems to do create an unnecessary risk for those of us pitting near them.
Are you saying there's no difference in performance between a 1C charge and a 2C or 3C charge? And that the ONLY difference is that the packs charge up faster? Also, do you feel 2C or 3C will have much impact on cycle life of your packs?
I know of a lot of guys that are charging are very high rates because they think it's making them faster. All it really seems to do create an unnecessary risk for those of us pitting near them.
As far as creating risks at the track I don't think there is any more risks using a higher charge rate. If you want to cut the risks at your track get the track to enforce a Lipo sack rule. I don't think charging at 2C is a risk. In fact when playing around with overcharging we found that overcharging at higher amp rate actually worked better than a lower charge rate. At the lower charge rate we did see some swelling. Once again overcharging should never bee accepted but I'm just pointing some of my findings.
11-29-2008, 02:42 PM
#1408
Swelling from the lower charge rate ?
Is that a typo?
Is that a typo?
