Hot Battery

[jamie]

my ta02's battery pack gets hot while running that car. any sugestions as to the cause. motor stays cool but maybe too cool that is why i am thinking the car is under geared.[8)]

[TWO STAR]

a cool motor is a good thing,you want to keep it that way,how is the temperature of your speed controll?,are the cells getting "hot" or just luke warm?.do you run the car directly after charging them?.naturally batteries will get fairly warm or luke warm after running.do you run the car completely unil the battery pack is dead?.

what type of battery connections do you use?.

[raemin]

On trinity website they explain that battery heating is often due to the way the packed is soldered. Among other thing, they suggest to build your own and not rely on the ready made packs (the soldering point is very small).

[WillyChang]

On commercially-manufactured stick packs, the cells are spot-welded (not soldered) using very thin strips of metal. These both have high resistance and will heat up if putting too much current through them.

Generally the motor should be at least warm... [?]

btw "warm" generally means 40-50degC (nearly too hot to touch)

Battery usually gets to about 35-40degC when fully charged.

Motors can get to about 60-70degC in use; over 90 its overheating!!

[terry.sc]

What motor is being used in the TA-02?

Try a different battery in the car. It could be a dead cell in the battery pack, this cell could make the pack hot. Alternatively it could be the weld on the metal tabs between cells, especially if a joint has broken.

[mr_lister999.]

Has it always been like that or just recently. I was once given a cheap £10 pack of new cells. They got incredible hot, gave very slow motor running as well. Straight in the bin they went and got a better one. The battery connector on the pack started to melt as well and i only had a tamiya silver can normal motor in my car!

[WillyChang]

quote:Originally posted by terry.sc

...It could be a dead cell in the battery pack, this cell could make the pack hot.

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Actually a dead cell would either go open-circuit or shorted; either way it shouldn't promote heat whilst running. If cell is shorted, the pack will be hotter than usual whilst charging. If its open circuit, the pack will refuse to charge.

One thing to keep watch for is... about 10-15 yrs ago, when battery packs were still pretty expensive... some Asian shops had a batch of 7.2V stick packs that they sold to tourists in full RC car + radio combo with US-110V trickle charger plugpacks.

Unsure if these packs felt lighter than they should, but when they were opened up, these packs had AA nicads inside them. [:0]

Of course by this time, the buyer would have arrived home. [!]

[terry.sc]

quote:

Actually a dead cell would either go open-circuit or shorted; either way it shouldn't promote heat whilst running. If cell is shorted, the pack will be hotter than usual whilst charging. If its open circuit, the pack will refuse to charge.

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You're right Willy (we agree[?])

Either way when it dies you would know about it.

Sorry about that, meant a bad cell. When a cell has a problem, for example if a cell in an unmatched pack has a lower capacity than the others and is regularly overcharged, the cell can get hot. Had an old race pack that used to get hot while racing, after testing on a ProTrak battery charger the bad cell was found to have a low capacity. Replaced the cell with another matched cell from a spare pack and the pack ran cooler.

Jamie, we need more information about the equipment and use to answer the question.