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How hot does your battery get?

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Old March 12th, 2010, 20:23   #1
SlashH4X
 
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How hot does your battery get?

I'm just curious how hot your battery gets when you charge your battery and during games. I'm concerned my battery is getting too hot while charging.

Last edited by SlashH4X; March 12th, 2010 at 20:25..
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Old March 12th, 2010, 20:30   #2
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I use lipo, it doesn't get hot, ever.
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Old March 12th, 2010, 20:34   #3
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Quote:
Originally Posted by SlashH4X View Post
I'm just curious how hot your battery gets when you charge your battery and during games. I'm concerned my battery is getting too hot while charging.
what charger and battery are you using?

some of mine get hot. not too hot that I can't pick them up but hot enough that I don't want to hold it for a long time.

but, that's because I'm fast charging with higher amps than the battery is.
ie. 8.4v 3300mah I'm fast charging at 4A (4000mah)

I've never noticed my batteries get warm during use.
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Old March 12th, 2010, 20:46   #4
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You should NEVER charge a battery at greater than 1C. That's an excellent way to kill it.

A battery will get warm during charging. It should never be too hot to touch. Same with draining.. it will get warm, but should never be any hotter than when you charge it.
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Old March 12th, 2010, 20:49   #5
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Ive noticed that some lower quality batteries will get hotter than usual
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Old March 12th, 2010, 20:49   #6
coach
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1C?

meh, haven't had an issue. I know duckman's been doing it this way for years with out issue.
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Old March 12th, 2010, 20:50   #7
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Ive noticed that some lower quality batteries will get hotter than usual
Probably because of high internal resistance within the cells.
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Old March 12th, 2010, 22:57   #8
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Mine melted once, but other than that never had any problems.
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Old March 12th, 2010, 23:05   #9
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If you have a delta peak charger (more than likely) then your battery will get hot towards the end of the charge cycle. This is normal. What happens is when you're passing energy through a cell, it gets transferred to stored electrical energy. When the cell is reaching its capacity, it can't take as much electrical energy, but it still must absorb the energy, so it transfers it to heat energy. The charger measures the voltage coming off the battery, so when the voltage difference between two time intervals increases by an amount below the set delta peak, the charger cuts it off and it is done charging. The lower you set your delta peak on your charger (if you can even set it), the hotter your battery will get, but the more charged it will get. I use 8mV/cell for mine and my batteries get pretty warm. Make sure you're using a quality charger, else it might overcharge. Generally if you put the battery on the inside of your forearm and it is too hot to keep it there then it is too hot, and may have been damaged.
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Old March 13th, 2010, 01:16   #10
ThunderCactus
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1C means if it's a 4000mah battery, charge it at 4A max. If it's a 1600mah battery, charge it at 1.6A max
NiMH Batteries will usually get pretty hot in the last 500mah of charging, that's normal. My 7.2v 4200mah battery gets so hot you almost can't hold it, but it's done that for years and still holds 4200mah.
Also, when your firing, stock gun wiring will heat up pretty fast because of the resistance in it, more resistance = more heat. Your battery shouldn't get too hot unless your firing alot

And if you don't like hot batteries, buy a LiPo, they never heat up!
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Old March 13th, 2010, 01:24   #11
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I charge at around 0.75C and my batteries never get above 28'C (my charger has a thermal sensor.)
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Old March 13th, 2010, 04:43   #12
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What does it mean if the battery and wiring get really hot after only 20- 30 shots semi or auto??modift 100, g&p120.High Amperage through the circuit?? i.e. high restistance,binding gears,motor adjustment, spring tension???
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Old March 13th, 2010, 14:20   #13
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I mean electrical resistance(ohms). The stock wiring in AEG's is crap, and the thinner the wiring, the higher the resistance. So 18 gauge stock wiring will get hotter than 16 gauge stock wiring when your firing full auto. But high quality silver plated wire won't get hot at all because there's very little electrical resistance in it.
This is also another reason to upgrade your wiring and use a MOSFET, your losing power because of the resistance in your wiring, and especially the resistance in your trigger (~60 ohms). Using a MOSFET reduces your trigger resistance to ~8ohms, giving you a noticeable ROF boost.
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Old March 13th, 2010, 15:00   #14
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Any idea on where to get some good quality wire? Copper or Silver, it's pretty much the same, I just need multi-stranded (as much as possible) and has a good, thin insulation.
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Old March 13th, 2010, 15:00   #15
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