Do Higher C lipos run cooler then lower C

[d.a.v.e]

I took my boat out for its first run today, fully stock. I had 2 x 20c 2c 5000's lipos in the boat.

I would guess my run lasted about 5 min. All the electronics were cool when I brought it in but both my battery's were puffed up and very warm. Swelling on both have gone down after about an hr. I was wondering if I bought higher c rated batteries if they will run cooler and not swell? Maybe its ok if they swell but having had a lipo go up in smoke on me once before I tend to worry when I see puffing.

[Darin Jordan]

Generally speaking, yes...

[Doby]

Did the LVC kick in?

[TheShaughnessy]

those batts should power a stock MG pretty easily, who makes them?

[d.a.v.e]

Yes the LVC kicked in & they are True RC battery's.

Is swelling bad or normal when they are discharging? I have not experienced this with my RC cars before? I seem to recall its only bad when charging?

[Doby]

Boats and cars are totally different animals when it comes to battery drain. Running LiPos to LVC is generally not a good idea. How old are the batteries? Have they been drained to LVC before?

[planezero]

PLEASE do not charge puffed cells...
Do some google-ing ...

[d.a.v.e]

One of them has been run to LVC before on my slash once. Both are 3yrs old & have been raced 1 night a week for about 4 months of the year.

When I checked them on the charger after this run they were at 3.78 per cell & I put 4200mah back into them. So not too bad.

The batteries are not puffed anymore but they did puff when running. I have done some googling and it seems the consensus is its ok to charge if they go back down after puffing. But not to charge a puffed batt.

This idea scares me.. Wondering if you guys experience this? Thinking I will pick up another 40c batt to match a new one I have and try running that tonight or tomorrow to see if they puff?

I had the esc set to the low setting the manual recommended.. Wonder how it would do in the high setting?

[Doby]

Don't mix and match old and new LiPos.......the old one won't survive long.

[dana]

20c isnt enough.

[d.a.v.e]

So whats the min C rating I should be looking for if 20 is not enough? 30c, 40c, or higher? I picked up another 40c Venom to match the once I bought for my last race in March.

I'm thinking of getting something from hobbyking (like others here) but not sure which back order list to get on :)

I'm not looking to make this a true race boat but will be running with 6-10 other folks so I need to balance run time and speed.

[jac4412]

The higher the c rating the better... 25c is probably the minimum, 30-40 is solid and 40-50c is awesome.

[d.a.v.e]

How many sets of batteries do you guys have? Trying to decide if three sets of packs will be enough or how many more I should consider buying?

Seems our local club runs about 6 laps = about 1 mile per race + any warm up time (about 2min I'm told). Thinking that would be 3 sets + any for practice, guessing 5 sets would be needed? Not sure how much time there is between races for charging? I forgot to ask but would assume 2 heat races and a main?

[TheShaughnessy]

How many sets of batteries do you guys have? Trying to decide if three sets of packs will be enough or how many more I should consider buying?

Seems our local club runs about 6 laps = about 1 mile per race + any warm up time (about 2min I'm told). Thinking that would be 3 sets + any for practice, guessing 5 sets would be needed? Not sure how much time there is between races for charging? I forgot to ask but would assume 2 heat races and a main?

that depends on how many classes are racing. You could have over an hour between your heats so charging wouldn't be too much of an issue.

You should probably have at least 2 sets of 4s that you can run. Should get you though 2 heats with enough time to have the packs from the 1st heat charged for the main.

[martin]

The thing i find going to higher c lipos is what i noticed initially because i was using the exact same set up simply using a higher c battery things did seem to be cooler. But i found because things were cooler i could start pushing things a bit further as you do for more speed & you end up back to square one higher temps but faster still. I went from 25c to 45c now using 60c not in a Spartan buy the way. Martin.