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Old 12-12-2011, 07:06 PM #1
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Default Battery amp question

Just curious how the amperage plays a roll in batterys. I have some guesses but what I'd really like to know is what kind of effect is using a battery 200mah less then the one that was with my laser from the manufacturer. A 3.7v 3000mah compared to a 3.7v 2800mah.


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Old 12-13-2011, 04:17 AM #2
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Default Re: Battery amp question

Quote:
Originally Posted by Mattman420 View Post
Just curious how the amperage plays a roll in batterys. I have some guesses but what I'd really like to know is what kind of effect is using a battery 200mah less then the one that was with my laser from the manufacturer. A 3.7v 3000mah compared to a 3.7v 2800mah.
If they were both honest ratings from a "brand-name" manufacturer . . .

you would not notice the difference.

Some chinese mfg's however, label their 1500mah cells as 3000mah.

Also they have several times higher Internal Resistance, which causes the voltage output to sag under heavy load.

See the post at the top of this topic.

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Old 12-13-2011, 11:41 AM #3
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Default Re: Battery amp question

If both batteries were made by the same manufacturer the
mAh indicated on a battery is the Capacity of the battery.

You could roughly look at it as a container holding 3000 liters
of a liquid and another container holding 2800 litters of liquid.
If you put the same size hole in each container...the 2800 liter
container would empty first.


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Old 12-20-2011, 01:52 PM #4
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Default Re: Battery amp question

I was wondering the same thing, I have been into R/C for a long time and the MAH only affects run time and not the actual power. Is it different with lasers? Does the driver set MAH to the diode and not volts? So we can still use high MAH batteries because the driver locks what actually gets through. Kind of thinking out loud so I can get confirmation on this. I have found some R/C 3.7v round stick packs that are 5200mah so they should last awhile. They are 34.99 and I already have a charger for them.
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Old 12-20-2011, 05:44 PM #5
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Default Re: Battery amp question

mA*h is a measure of capacity. The way to think of it is in order to completely drain a 2800mAh cell in one hour, you would have to discharge it at 2800mA.

The driver will usually pull a varied current across the span of a battery's charge (unless you are using linear drivers, those pull the same current across the span of a battery's charge).

Either way, though, more capacity is more capacity. It will yield longer runtimes. The battery you mentioned sounds like two 2600mAh 18650 paralleled.
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Old 12-21-2011, 05:32 PM #6
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Default Re: Battery amp question

Yes that is exactly what it is, but a host made for 2 18650 it would be the perfect battery if it was a quality lipo.
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