Just a quick battery temperature question...

[Neon_Dave]

After driving my TC3 around, my 7 Cell pack started to get pretty hot. I mean hot enough to warm up the hot glue enough to basically reshape the glue.

I'm guessing they're too hot? :rolleyes:

What do you think?

Thanks,
Dave

[nmt6789]

It doesnt take much to heat up hot glue... I think you mean shoe goo? Anyway, you should be able to hold it in your hand with out burning yourself.

[elcid4300]

After driving my TC3 around, my 7 Cell pack started to get pretty hot. I mean hot enough to warm up the hot glue enough to basically reshape the glue.

I'm guessing they're too hot? :rolleyes:

What do you think?

Thanks,
Dave

What type of motor are your running? If you are running a pretty low turn motor, they can draw some serious power and heat batteries up pretty toasty. Also, if they are older or are a generic cell, they might not be up to the task of low turn motor. If you can keep your finger on the batteries when they are "hot" you are probaly ok, if not, they're might be other issues. Let us know.

[Neon_Dave]

I can hold the battery in my hand w/out any issues, just the problem is the hot glue I used melts and the cells dont exactly stay together.... Another thing I think may contribute to this extra heat is those paper thin battery bars that came with them.... :rolleyes:

Anyways, my motor is a Raven S 10X2, with about 1 comm cut left till it dies :p - in other words, a horribly un-efficient old 30$ motor that has less than half a mm of comm left on it :D :D :D

I'm just running this motor till it dies with the most I can get out of it, I have a replacement waiting to go in, an Orion Method R 10X2, that is currently collecting dust.

As for the battery cells, they are some cheapo 4.50$/cell 3000 Mah Ni-Mh cells I bought just for experimenting with the 10T on 7 and soon to be 8 cells..... Come to think of it for 4.50 they're doing pretty well, I would say with the 7 cell pack and the old Raven, 27/72 gearing, the ol' TC3 is doin nearly 60 Mph and runs out of space as the motor just keeps revving higher and higher. I havent found a spot yet to drive the car in a stretch of more than 150 feet anyways.

The really surprising thing is, that its somewhere around 5 degrees celsius here in S. ON right now, and everything BUT the batteries stay surprisingly cold. Warm at most. I even have some useless holes that are in the place of where real hood/roof scoops would be on a real car :)

-Dave

[elcid4300]

just the problem is the hot glue I used melts and the cells dont exactly stay together....

Sound like you need some http://eclecticproducts.com/shoegoo/images/pd-shoegoo.jpg :D

[Neon_Dave]

:) Thanks. I'll try it.

-Dave

[guver]

sounds like you are geared for high speed runs and by that possibly getting decent cooling on the esc? High speed runs are nice, but with 8 cells and a 10 turn motor and high gearing turns it into a wide open running machine only. Probably just exactly what you want , right?

I run a street evbx with 14 turn motor and 8 cells and the motor just screams, I thought I was at the max, but you have me beat.

[Neon_Dave]

Only the batteries get hot, the motor and ESC especially stay relatively cool. Considering it's about 5 degrees C outside, I wouldn't expect any more.

And yeah, I'm geared for high speed runs 100%, since the nearest track is pretty far away and I only get to go to it like once every two months or so, thats basically what I'm limited to. After my friend gets his liscence though, that will change :)

-Dave

[highroller]

Batteries will get hotter in use than what their get when charged. Loads put on them are normally greater, it's charged at 3-6amps taking 38 - 58 mins to peak charge but only 5-25minutes to remove that charge in use sometimes seeing amp loads of 5-50 amps.
If you use loose cells to build your packs use a good battery bar that provides some rigidity and normally you don't have to worry about gluing the cells together, in some instances you may want the pack to have some flex. If you do want to secure the cells use the products others suggested: Sho Goo, CA use single cell shrink to protect the original covering when using CA glue.

I made that same mistake of using hot melt glue once, should have seen the mess it made. Mid way though a race heat, someone said something was coming the back (oval racing) of car at first I thought it's nothing them I remembered the hot melt glue.