lipo battery help

[theroyalmachine]

hello I'm a new E-revo owner (got the jato 3.3) and new to electric, i have just purchased the Triton2 EQ lipo charger and need help choosing some good 2S lipo battery's... my order came with 2 traxxas 8.4volt nimh 3000mah battery's and 2 venom 2S 5000mah lipo (still waiting for the venoms to be delivered so not had a chance to try them) so any help would greatly be appreciated.

one more thing after running my revo (and bashing ) the traxxas battery's are very hot....is that normal?...thanks

[hexitnow]

personally i like *****'s from *********, very cheap, and they get the job done.

it's normal for the traxxas packs to get quite warm, and any other nimh pack for that matter. one thing about nimh's i'll never miss is the heat produced, and the brick like weight.

[k0rppi]

brushless takes nimh to there limits so ofcourse those will get hot

[theroyalmachine]

has anyone tried these

http://www.horizonhobby.com/Products...source=froogle

or these

http://www.rcplanet.com/ProductDetai...N5360T&click=3

can you get batteries from ********* with the traxxas connector?
thanks guys

[skeppley]

Try 2 of these.
Great price and LONG run times:
http://www.spcracing.com/index.php?productID=61

[theroyalmachine]

cool i'm check into those...thanks

another question....how liked are venom lipo batteries?

[anr2442]

With batteries... you can hurt yourself with too small a c rating and/or amp output. The "weaker" batteries will either
A: give you little punch or
B: take the ESC and heat the motor up b/c of the excess stress.

You can always combat this with smaller gearing. But the real fix is to get batteries with high enough discharge for your application.

MMM needs at least a 25c rating for 5000mah batteries when run in series (2s or 3s lipo). So you may strain your system with the venom 2s 5000mah if they are only rated 20c constant discharge. The higher you go the easier the batteries will run and thus last longer.

[dshaffer]

i would highly recommend the hyperion packs http://www.rcdude.com/servlet/the-14...X--dsh-/Detail
they are awesome. Many on these forums use them and i haven't seen one complaint yet. I have a set and they are much more powerful than my ***** 5000 30c packs and reedy 5000 35c also. They fit the battery tray of the brushless revo like a glove to. Just ordered another set last week, they should be arriving soon.

[theroyalmachine]

with batteries like that which need the traxxas connector soldered on can you get a hobby shop do this?

[anr2442]

with batteries like that which need the traxxas connector soldered on can you get a hobby shop do this?

Yes most of them will. Don't let them charge you something ridiculous. I'd say $15 labor for two packs would be MY tops.

[makaveli72]

with batteries like that which need the traxxas connector soldered on can you get a hobby shop do this?

Or just get yourself one of these and some of this and solder them on yourself. And you can take your time and all day if you have to and get it done. Like I did

Seriously it's not that difficult to do at all. Just requires a little patience; as with anything else in this Hobby.

[dshaffer]

yes u have to solder on the traxxas connectors on the hyperion packs. Im sure your lhs would be willing to do it for u if u dont feel comfortable doing it. Its pretty easy to solder on the connectors, just be very careful u dont short the wires together

[Hughes500Bob]

You will need to solder the correct power connector on most any pack. I've posted my method for doing Traxxas HCCs many times (I've done over 100 of them!). For Hyperion packs you will probably need a tap adapter to match them up to your charger (unless you have a Hyperion charger!) .... but don't let that stop you from considering these great packs. I get my Hyperions from http://www.allerc.com

If you want my soldering Traxxas HCC tutorial post PM me.

Bob

[theroyalmachine]

anyone tried these?

http://www.rcspeedzone.com/search/dyn5352t.html

or

http://www.rcspeedzone.com/brand/dynamite/dyn5361t.html

[Mc-Roux]

Personally I would look for some SPC 2s 8000 mah 20C pack, or from SPC website too SMC 2s 8000 mah 28C pack, they are 10$ more but has a 28c disharge rate witch is awesome for ERBE. SPC and SMC pack from SPC racing.com come with deans or Traxxas connector already soldered.
SPC

You can also look for some Hyperion G3 pack if you have a little bit more money.

For Hyperion pack look on ebay if you want. I got mine there for 97$ free shipping.

And if you're on a budget get some ******* lipo from *********.
*********

Think that you got a 700$ car in you hand with expensive electronic component. Personally I think that if you can afford an ERBE it's not time to got cheap on lipo and risk to blow up the esc. So try to get at least 5000 mah 30C+ lipo or 8000 mah 20c+ lipo. Lower than that you increase the chance to blow you're esc.

[theroyalmachine]

is this the battery Mc-Rous
http://spcracing.com/index.php?productID=103 i just ordered 2

sorry for the noob questions but i just ran it on venom 7.4v 5000mah 20C and i ran the car for a good while then when driving it to my front door the car just lost power, if i squeezed the trigger it just jerked and stopped? engine temp was about 120f.

charged my venom's back up and tried again.....my sexy revo has not changed a bit...engine got up to 100f, is all that normal or should i take that as a warning sign not use those batterys? thanks again guys.

oh and yeah next two weeks i'll order a pair of those Hyperion

[anr2442]

is this the battery Mc-Rous
http://spcracing.com/index.php?productID=103 i just ordered 2

sorry for the noob questions but i just ran it on venom 7.4v 5000mah 20C and i ran the car for a good while then when driving it to my front door the car just lost power, if i squeezed the trigger it just jerked and stopped? engine temp was about 120f.

charged my venom's back up and tried again.....my sexy revo has not changed a bit...engine got up to 100f, is all that normal or should i take that as a warning sign not use those batterys? thanks again guys.

oh and yeah next two weeks i'll order a pair of those Hyperion

It sounds like the batteries hit the LVC (low voltage cutoff). LVC is totally normal. It's for lipo batteries b/c they are not supposed to go below 3.0v per cell. If they go any lower... then it may shorten their life or even cause you to ruin one of the cells inside the battery. A bad cell will give you shorter run times and less performance. Also don't ever charge it to above 4.2 volts per cell. In your case that means don't go below 6.0 volts or above 8.4 for the battery.


the hyperions have free shipping at http://www.allerc.com/

[Hughes500Bob]

LVC at 3.0 volts per cell is under LOAD. Cells should come back up after resting to 3.7 volts per cell ideally. MOST chargers will not start a charge on a 3.0 volt cell. Any voltage on a lipo under 3.6 volts is in the voltage dump zone. When you charge you should not be putting back more than 85% of the packs capacity. A 5000 mAh pack should not be getting more than 4250 mAhs put back into it for longevity of pack.

Cheap packs ... hey I don't care what you do. Expensive packs ... take care of them and they will last for hundreds of cycles.

4.20v = 100%
4.03v = 76%
3.86v = 52%
3.83v = 42%
3.79v = 30%
3.70v = 11%
3.6?v = 0%

Capacity below 3.7v "resting" is not usable for driving, it's where the battery voltage dump begins.

Store lipos at 50% (3.80 -3.85 volts per cell) if not using weekly to prevent build up of Internal Resistance (IR).

I've been using lipos for 5 years (planes, helis, trucks, boat) and have 5 year old lipos that have hundreds of cycles on them.

Bob

[shanenoo]

Try 2 of these.
Great price and LONG run times:
http://www.spcracing.com/index.php?productID=61

+1
i have them and love them.

[anr2442]

So should the LVC for all lipos be right at 3.6v if you don't want to ruin your lipos?

[Hughes500Bob]

Again ... Proper LVC all depends on the LOAD, weight, gearing, etc.

Someone racing at the track would be fine with 3.0 LVC .... while someone walking a trail with the ERBE taking the lead to chase away the rattlers LOL might be best at 3.6v LVC.

The goal is to have the packs come back to 3.7 volts per cell after resting. This will allow about 85% of your packs rated mAhs to be added during the charge which is perfect!!

I'd like to suggest if you have the Castle Link ... read up on the LVC setting options and to set 3.4v per cell x number of cells you are running and work your way up or down from there.

Bob

[theroyalmachine]

how often should a lipo battery be discharged?