Hot Battery

liamo333

When your battery gets hot does it mean it is full?
Thanks.

kdouglas

yup, batteries tend to heat up when under heavy use and when charging, i remember reading somewhere recently that when the battery reaches about 5-10 degrees above room temperature, it's full. If it get's very hot then you may be overcharging it and could damage the battery.

smart chargers are very handy, got one recently and fully charges a 1700Mah battery in about an hour, stops charging when they are done too

Fiach Dubh

Fast charging a battery will tend to make it heat up more so then slow charging, it also depends on the make of battery. Amps are the main reason, the higher Amps the faster the charge. I use a fuzzy logic smart charger with which you can set the Amps manually. I charged a Sanyo 8.4v 1700 mAh battery in about 1.2 hours at 2 Amps and it was only slightly warm. However I charged an Intelect 9.6v 1400 mAh battery in about 40 minutes at 3.5 Amps and it was quite warm, boardering hot by the end.

So yes, when the battery starts to warm up it's usually reaching capacity. However I wouldn't use this to much as a gauging method if you aren't usng a smart charger with auto cut off. An overheating battery runs the risk of exploding.

ED E

Fiach, what charger do you use?

I have a Tlp 4000c Fuzzy Logic.....Ohh the beeping!

Harekin

You should always slow charge your batteries at most 0.5Amps or you will reduce its overall lifetime.

Wossack

there was a trend a few years ago (when I used to race RC cars) with temperature sensing chargers - you stuck a temperature probe into the battery pack and it was used to determine when the battery was fully charged.

um... not to sure what thats got to do with anything, but yea increase in temperature is not really of concern - just dont let it get so hot as that you cant hold it, 5-10 degrees as mentioned above sounds right.

kdouglas

Lethal_Bullet wrote:

Fiach, what charger do you use?

I have a Tlp 4000c Fuzzy Logic.....Ohh the beeping!

have the same one here, bloody beeping is incredibly annoying, think ill open it up and remove the buzzer

Mark_Sc

kdouglas wrote:

have the same one here, bloody beeping is incredibly annoying, think ill open it up and remove the buzzer

If you remove the buzzer you should put in a resistor, i hear chargers are quite sensitive;)

kdouglas

??????

i doubt the buzzer is part of the charging circuit? i dont see how the buzzer would affect it?

Mark_Sc

well the buzzer take up x ohems and if you take that out the circut will be y (the original amount) + x ohems. and that could be too much for some other part.

But could be wrong and digging myself into a big hole

kdouglas

yea, i understand that part, thought you meant that removing the battery could mess up the capability of the charger to charge the battery or even damage the battery...

i'm assuming the control circuit (buttons/led's/buzzer) part of the charger and the actual charging components are seperate to one another, so shouldnt have any affect on charging, but ill measure the resistance in the buzzer and put in a suitable resistor just in case.

Fiach Dubh

kdouglas wrote:

have the same one here, bloody beeping is incredibly annoying, think ill open it up and remove the buzzer

I'm using the same charger, it beeped for the first few times I used it, now it's stopped doing it. The beeper isn't broken though, it still beeps when I start a charge and when it shuts down.

It's not worth my time slow charging when I have 5 or 6 batteries to charge, I'm not charging each of them for 14 hours and since you shouldn't leave a charging battery unattended I'd rather charge them in 1 hour. Speed charging will reduce a batteries charge cycles by about 50-100 out of about 1000 cycles. Since batteries are one of the least costly aspects of Airsoft it's well worth it.

kdouglas

yup, do the same myself, leave it on fast charge until it's done..

i wonder if there is a way to turn off the beeper by some magic key press or some such

Fiach Dubh

I looked around on the net for a way to turn it off myself. A lot of people are cheesed off by the beeping, seems to be no way of turning it off. That being said there may be some sequence of button presses only known to the factory. Maybe I hit it by accident.