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Trying to decide on a Lipo battery for x30
first thing I'd look at is the voltage the starter can actually take not just grabbing whatever lipo is cheap. I'm still learning so I dont want to fry anything on the x30, also they bounce around more than a regular pack if you don't strap them down good. what are you guys even running
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LiFePO4 and LiPo are different chemistries, not interchangeable lithium packs. LiFePO4 (lithium iron phosphate) is thermally stable and holds a fairly flat discharge voltage, but typical small cells have high enough internal resistance that starter stall current produces resistive heating and shortens pack life. LiPo can deliver that current because of lower resistance and higher energy density, which is why leftover RC packs look like a solution and why they still fail the safety case on a kart: the cells are sensitive to shock, puncture, heat, and charge abuse, and thermal runaway on a chassis has already produced on-track fires that can melt brake lines.
Match series cell count to a 12 V starter and solenoid instead of shopping by C-rating or cheap capacity, because extra cells overvoltage the windings and an underspec pack just sags and overheats. Strap any pack so it cannot bounce (vibration and case damage are a known failure path), do not use LiPo on an X30, and treat a conventional 12 V starter battery as the default if a small LiFe pack's current limits are not acceptable.
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A lipo on a kart chassis will rattle itself to death if you just set it in there. a fella needs it strapped down hard against something solid not a bungee that lets it hop every time you hit a curb. The cells take that pounding worse than a regular pack does.
Heat in a closed trailer with the pack left sitting full is rough on them too, i reckon that does more damage over a season than the starter ever will.
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If the pack is sitting in the trailer all week you can lose Saturday before you even unload. I'd check the resting voltage at home and top it with a proper charger made for these packs, not some random wall plug, because a saggy pack just clicks the starter and then you have a kid in the seat and nothing happening.
Stay on a three cell pack so you aren't shoving extra volts into the starter. Strap it down tight too, a pack that walks around and unplugs on the grid costs you the same as a dead battery and you don't get that time back. A second one already charged in the pit box is cheaper than sitting out a heat.
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On a rutted oval a lipo will beat itself to death if it ain't packed in there tight. Foam it in so it can't walk and keep the plug clipped so it don't pull loose. Dirt in that connector will have you swearin the pack is dead when it just needs a wipe.
I'd stay on a 3S. That sits close enough to 12 volt that the starter is happy, a 4S is askin the windings to eat more than they was built for. Ain't gonna hurt nothin to spend a minute checkin the label before y'all clip it on.
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