Hot battery and connectors

[Gary]

Hey guys. My PT Supersport 45 has been running perfect but does have a heat issue with the wires/connectors/batteries. Batteries are around 130* after 5 min. and connectors are pretty hot and wires aswell. ESC is 120 and motor around the same. Heres the thing.........the batteries also look slightly swollen and than return to normal after they cool down. They are Thunder Power 45-90c 18 volt 4,500 mah run paralell.Internals are Hydra 240hv,x647 prop, 10lb boat, Neu 1527 1d motor. Boat runs consistantly 84-85 mph on 18 volts and will run 70-72 on 14 volts. Also it has been 90 degrees out so that does not help.Any thoughts?

[Fluid]

Five minutes is a long time for that big boat. I think that your temps are not bad considering the run time. 130F is fine for the packs, and 120F for the ESC and motor is great. It is normal for connectors to be pretty warm, but it may be a good idea to change them out for new ones of higher quality.

I have had some TP packs do the same thing, a slight swelling when hot but they deflate when cooled down. This is normal with the tight shrink they use. As long as pack temps stay under 140F you are fine. Actually the high ambient temps do help the cells deliver more power - they are weaker when cold.


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[sailr]

I totally concur with Fluid. What size connectors are you using? So long as they don't melt the solder I wouldn't worry about it. Your motor/batt/esc temps are excellent considering you're running it twice as long as a normal heat race! Wish I could be that lucky most of the time!

[Gary]

Ok thats good to hear. I run 8mm bullets and cut the wires as short as possible on battery leads.Normally I peheat the batts to at least 95-100* before I put them in boat but thought the outside hot temps where making them to hot to fast....beyond 125*.Also I useually put back around 2,800 mah each when I recharge them so didnt think they where being run that long but i will shorten the run time to around 3 min. and see what happens.I was more concerned with the swelling. Thanks for the info.

[sailr]

Also, if you are running much at less than wide open throttle, you can get stuff heated up pretty good. 8mm bullets? Wow! Certainly no issues with those big babies. I only use 5.5mm as I think most people do. If you're only putting 2800 back in the packs after 5 minutes you have a DREAM setup! Don't change a thing!

[graill]

Also, if you are running much at less than wide open throttle, you can get stuff heated up pretty good. 8mm bullets? Wow! Certainly no issues with those big babies. I only use 5.5mm as I think most people do. If you're only putting 2800 back in the packs after 5 minutes you have a DREAM setup! Don't change a thing!

Wow too, 8mm? i use those for multiple wire setups (2 or 3 10 gauge wires in one hole) for motors or batteries that are never pull apart and need a nice solution. I have two different brands, both from the same supplier, they make me cry when i do try to pull them apart.

[Fluid]

Actually the 8mm connectors could be the source of the "hot" wires. They act as heat sinks and hold their heat longer than the smaller ones. OR they may not be making good contact. I know that some of the ones I have are tight on two or three leaves but loose on the others. I have to "tune" them to get a consistant but not too tight fit.



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[LiPo Power]

How old is your motor? How many runs are on it?

[Gary]

Wow i just assumed that they,8mm bullets, where the way to go for high amp setups. I do make sure they are a snug fit always . Motor is new and around 12 times so far to the lake. I am going to use a thermal gun next time and test every place on wire set up. I would think there is some power to be found in a cooler wire setup.

[Fluid]

Wow i just assumed that they,8mm bullets, where the way to go for high amp setups....

I believe they are, they don't create heat just re-position it on the wire. If they fit well I'd not change them.


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