View Full Version : lithums batteries question....help me out here
dylan1
01-28-2008, 03:44 PM
so i was serching www.atomicmods.com and found this lithum pack http://www.atomicmods.com/Products/XMOD-EVO-HD-Lithium-Polymer-Pro-2S2P-10C-Pack__10399.aspx what charger do i need for it im confused on that,link if possible and if anybody knows if it really works that would be helpful too thanks in advance :bigwink:
2wdpancar
01-28-2008, 04:22 PM
You need this:
http://www.atomicmods.com/Products/Lithium-74V--500mAh-Charger__10040.aspx
And this plugs into it:
http://www.atomicmods.com/Products/12V-500mAh-Power-Adapter-w-JST-Connector__10039.aspx
Read the safety precautions, you need to fully understand the results of inproper care:bigwink:
dylan1
01-28-2008, 05:09 PM
thatnks alot you were a big help.do you (or anybody else reading this) know how it works (performace wise)
2wdpancar
01-28-2008, 05:14 PM
Check out my stuff.
I use lipo packs on all of my cars.
They are well worth the dough.
You read on them yet?
Search youtube for:
"Rc lipo explosions, lipo explosions"
Thatll show you the outcome if poor care:bigwink:
It ain't good, in other words.:lol:
dylan1
01-28-2008, 05:23 PM
ok well atomicmods site has lost all the pages in which explain the explosions that you were talking about so maybe you could give me the basic what not to do or only do this:.... and its compatible with the xmods trucks?
2wdpancar
01-28-2008, 05:28 PM
Well they can drop below 3volts, and become worthless(throw em away.)
They can blow up:
-If charged too long
-Drop below 3v
-Overheat
-Temps(too cold/hot)
Get that charger, once it's done IMMIDEATLY take them off, and you're good.
Yes, they are fine for the trucks!:nod:
dylan1
01-28-2008, 08:20 PM
ok well thats preety self explainitory about how long is the charge so i can keep an eye out?and how do i let it not drop below 3v?
Donziikid
01-28-2008, 08:23 PM
ok well thats preety self explainitory about how long is the charge so i can keep an eye out?and how do i let it not drop below 3v?
Depends on the charger and the batteries. Maybe someone with that exact setup will be able to tell you an approximate time of chrage.
And there's no real way at this scale to keep your cells above 3V. Just run them until the performance drop; this tells you when the voltage is dropping. Then just peak them back up and run again. ;)
2wdpancar
01-28-2008, 08:28 PM
Depends on the charger and the batteries. Maybe someone with that exact setup will be able to tell you an approximate time of chrage.
And there's no real way at this scale to keep your cells above 3V. Just run them until the performance drop; this tells you when the voltage is dropping. Then just peak them back up and run again. ;)
Bingo!!!
If you have a 4S LiPo, you'll deff notice.
It's when your car goes SLOWWWWWWWWWWWW.
You'll notice, but you gotta pay very close attention, or bad things will happen.
Just for starters, you should go for a 6cell, taking you don't know much about lithium and the different effects.
dylan1
01-28-2008, 09:32 PM
well this is what i want http://www.atomicmods.com/Products/XMOD-EVO-HD-Lithium-Polymer-Pro-2S2P-10C-Pack__10399.aspx although you said i dont know much about them im a quick leaner so if somebody tell s me once ill get it in my head, so why would the voltage drop below 3v?and if it does how do i fix it,or i cant? and how do i prevent it from going that low?By the way im getting the 500MAH charger
2wdpancar
01-28-2008, 09:37 PM
OK, I'll try to explain again.
They can drop because of low battery life, that's mainly the issues.
Don't keep driving if the power decreases, you'll be able to tell.
You CAN'T fix the 3v issue, once they drop, they're dead.
Just don't charge them unattended, if your house burns down please don't come crying to us.:bigwink:
dylan1
01-28-2008, 09:56 PM
ok got it,so lets just say i charge it messaroudn with my xmod but do i drive until the battery is dead like normal batteries because you said once there down there down that kinda got me a litle so just that quick question adn i should be on my way
2wdpancar
01-28-2008, 09:58 PM
OK,
No.
You can't drive it until it's dead.
When you see it going low(mAh), STOP.
This is when the batts or one of the cells can drop below 3v, hence making the rest of the pack worthless.
You can salvage it for parts, but yeah...
dylan1
01-28-2008, 10:01 PM
alrighty then i think i got it drive it until i notice a decrease in performace?
2wdpancar
01-28-2008, 10:06 PM
yeah. exactly.
You'll notice, the speed goes to the speed of the regular stock batteries, then scrappier and crappier, that's when the cells drop below 3v.
Make sure to buy everything though!
dylan1
01-28-2008, 10:08 PM
k got it,but will this really "double my top speed like it says it will?
2wdpancar
01-28-2008, 10:17 PM
You'll see double top speed, and a lot longer run times.
You won't be disappointed!
dylan1
01-29-2008, 04:21 PM
ok wow thats great!And more tourque? or just a top speed difference?
2wdpancar
01-29-2008, 08:18 PM
Not torque, really.
It gives it more punch, but the speed is great.:bigwink:
dylan1
01-29-2008, 09:07 PM
well i gotta say youve been a big help and ill IM you on your sn
2wdpancar
01-29-2008, 09:12 PM
well i gotta say youve been a big help and ill IM you on your sn
No Prob man, glad to help you out.
Alrighty, I'm not on, just add me right now...:bigwink:
xmodsnut
01-30-2008, 04:18 AM
well considering I have Li-pos and run them in only a few cars for a couple of reasons, one is cost, and two is charge time about an hour or so. they sell smart stops for Li-pos but not for xmods ESCs, yet.:cry:. a few of the things you have to worry about has been said but one thing and that is keeping the cells balanced during charging also, they get out of sinc and boom also.;) you can buy packs with safe charge built in like mine have so its one less thing to worry about. here is the setup in my titan.
http://i210.photobucket.com/albums/bb78/xmodsnut/IMG_0013.jpg
you will notice it is two720 Mah packs ran in series for a total of 1440 mah. this thing burns rubber with top speed gearing, 4WD and helimax on concrete. the only other one I run Li-po in is my monster truck, same setup as the other one but with torque gearing and no 4WD instead. both of them use the same electrifly charger. the packs cost about 25 to 35 bucks based on Mah which will be another factor with li-pos the more Mah the bigger the packs are.
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