Regular vs LiHV
We get asked allot about carrying LiHV packs and the reason why we don’t is due to the rules of racing not allowing packs to be charged above 4.20V per cell. Also when it comes to RTR ESCs some of them will not support packs charged to 4.35V. For example it will think a 2S pack is an over discharged 3S if the voltage of the pack is at 8.70V and will not allow the ESC to work.
Some of our
competitors who like to hype up the latest and greatest put out claims such as
LiHV packs will have a flatter discharge curve when charged at 4.20V compared
to regular Lipos so the voltage is to remain higher due to this flatter voltage
curve. Such claims made me want to do
some testing of various companies LiHV packs as in previous testing of LiHV we never
found this to be true. We’ve never seen
a LiHV cell at the same size/weight have better internal resistance then our Extreme
Graphene non LiHV cells.
purchased packs from different companies to compare these packs to our SMC
packs. The packs are all normal 25mm
height shorty packs. The testing
consists of getting the IR of the cells in the packs using the ESR II meter
that is available to purchase on the SMC site.
Then the packs were fully charged on the same charger and then
discharged at 35 amps down to 6v per cell on our pack discharger. The last test is our Power Factor test which
discharges the pack down at 100 amps for 5 seconds. This shows how much voltage drops at higher
amps. This is closer to what a pack will
do under heavy acceleration.
Here is the
list of packs tested listed in the order they were tested.
5100 Gold Label
DV. Our recommended pack for
mod racing as it will have less punch which is typically not needed in mod.
6000 Redline LiHV
IP6000 HV4 LiHV
6000 Gold Label LiHV
1: IR of the cells using the ESR II
meter with packs at storage charge tested at 22 degrees Celsius
Test 2: 35 amp discharge test from 4.20v per cell down to 3v per cell. As you can see by the graph the LiHV packs really don’t discharge flatter than the SMC 5100 Extreme pack.
Test3: Power Factor test. On the SMC site we list the Power Factor test per cell so if you take the last voltage reading which is at 5 seconds and divide it by 2 this will give you the single cell voltage.
In conclusion if charging to 4.35V is ever allowed in racing we will offer LiHV packs but in the meantime we feel there is no need to offer these packs as there is no advantage in using these when charging at 4.20V per cell.
Hope this test is helpful and if any one has questions about the tests feel free to email us.
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