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Old 07-04-2010, 07:58 AM   #1
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Default LIPO Package and Charge Cycles

Hi guys, I am planning to convert to lipo. I have been doing research and found that in order to use Lipos safely, i need the following items:

1) Low voltage alarm and buzzer (not sure how to use it while running the car)
2) Fire proof bag during charging
3) Charger with built in balancer or jus buy a stand-alone balancer while can be used during normal charging as well.

Did i leave out anything? And how many cycles can lipos be charged? I heard is only about 400 compared with nicd/nimh of 1000 cycles...

And the battery cables are sticking out from the top, hence some chassis like TT01E cant fit? Because the battery holder is blocking the cables?
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Old 07-04-2010, 10:53 AM   #2
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Originally Posted by jiewei1987 View Post
2) Fire proof bag during charging
Do you use one when charging your laptop or cellphone? Those equipments also use lipo. Not necessary in my humble opinionated opinion.
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Old 07-04-2010, 11:00 AM   #3
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[QUOTE=jiewei1987;7626060]
I heard is only about 400 compared with nicd/nimh of 1000 cycles...

I think you've got the numbers reversed! Never seen a round battery get 1000 cycles and still be usable!!! Lipos if treated right will last a Loooong time. The Lipo sack is really a safety thing. A MUST in my book...even if it's just used for transportation and storage!
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Old 07-04-2010, 11:16 AM   #4
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Oops, reading is fundamental it seems, my bad. Please move along, nothing to see here...
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Old 07-04-2010, 03:58 PM   #5
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Depending on your budget, it wouldn't hurt to get a speed control with a built in lipo cutoff. Hobbywing make a great speedy that will cost you under US$100 posted.
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Old 07-04-2010, 04:45 PM   #6
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Your list looks good, a couple of warnings though, the balancer you use, wether in a charger or external, will need the proper adapter for the balance port on your battery, I use the losi balancer and it comes with all the adapters I've ever seen.

Look into charge rates and understand them, a safe rule of thumb is 1 amp per 1000mah of battery size, aka 4800mah lipo gets charged at 4.8 amps, 5200mah lipo gets charged at 5.2 amps.

Charge only at the voltage of the lipo, 1 cell, 3.7v... 2 cell (also called 2s) 7.4v, 3cell (also called 3s) at 11.1v and so on. The s stands for series, which is how multi cell lipos are wires to increase voltage.

Only run the lipo your esc can handle, meaning dont try to run a 3 cell lipo on some rtr esc!

Try to buy an esc with lipo cutoff and set the esc up for said cutoff before using it, your car will just stop before you ruin anything.

Lipo batteries can be dangerous if unattended, stay close while charging, they should never get real hot from charging or use like nimh.

Hope this helps!
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Old 07-05-2010, 04:47 AM   #7
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Do you use one when charging your laptop or cellphone? Those equipments also use lipo. Not necessary in my humble opinionated opinion.
Mate. Laptops use lithium ion or li-on batteries. Not lithium polymer.. Different mixture..
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Old 07-05-2010, 05:34 AM   #8
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If you already have a lipo capable charger, then a seperate balancer will do fine. I have a Thunder Power TP-205 that I use with a Duratrax ICE charger.

If you still need a charger, look at high quality ones with built in balancers like the Hyperion EOS0606i or the Dynamite Passport Ultra. Whatever you get make sure the charger has a percentage charge setting. I have my ICE set at 90% and it's supposed to reduce the chance of overcharge, takes less time to charge, and also helps your lipo last longer. I use my ICE to charge Thunder Power 40C 5000mah packs.

As far as lipo packs fitting your TT01, you need lipos that are shaped like stick packs because of the way the battery recess is shaped like this...

http://cgi.ebay.com/Intellect-7-4v-4000mah-20C-Li-Po-Stick-Pack-Battery-/350313439562?cmd=ViewItem&pt=Radio_Control_Parts_A ccessories&hash=item51904ee14a
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Old 07-06-2010, 10:22 AM   #9
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million thanks to all the guys for sharing! good knowledge!
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