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Old 12-06-2024, 08:47 AM   #1
mtollin
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Default Dumb question about Lithium

Getting ready to install my new lithium. I keep reading where people say their top speed goes up after install. Question is why or how? If I have the rpms topped out at say 4k, then cart should stop power flow or kick in Regen correct? So how does a stock cart have a higher top speed by changing battery?
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Old 12-06-2024, 08:51 AM   #2
InvalidUsername
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Default Re: Dumb question about Lithium

Approx 300 lbs less weight
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Old 12-06-2024, 09:06 AM   #3
scottyb
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Default Re: Dumb question about Lithium

Decreased weight does decrease the load on the motor for sure.
Another key factor is the higher voltage of lithium vs lead acid and importantly the decreased voltage sag under load vs lead acid.
Basically you have reduced the load and increased the voltage with lithium.
Voltage, even a few volts, at top speed influences motor rpms.

If there is a rpm limit set in your sepex controller and the motor reaches that limit then the controller will limit the rpms to the setting regardless of the battery type or voltage.
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Old 01-02-2025, 11:38 PM   #4
mikec557
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Default Re: Dumb question about Lithium

Quote:
Originally Posted by mtollin View Post
Getting ready to install my new lithium. I keep reading where people say their top speed goes up after install. Question is why or how? If I have the rpms topped out at say 4k, then cart should stop power flow or kick in Regen correct? So how does a stock cart have a higher top speed by changing battery?
I think some reports of going "faster" is not actually a comment on top speed. Because, like mentioned above, the RPM limit setting doesn't change. But having just switched to lithium myself, I can tell you the acceleration is vastly quicker. I went into the Alltrax and detuned that setting. Now it takes a little more peddle to dump those lithium amps to the motor. LOL

By the way, the cart is 275 lbs lighter after the switch to lithium.
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Old 01-03-2025, 12:45 PM   #5
Volt_Ampere
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Default Re: Dumb question about Lithium

On my carts with Alltrax controllers Lithium does yield a higher top speed due to the slightly higher voltage. Acceleration is vastly improved due to the significant weight reduction. :-)
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