Ni-MH

I have two Ni-Mh batteries enclosed in plastic... they say they are 2.4 volts 500mAH. Does this mean that each one has 500mAH or 250mAH? They are in series by the way.
THank You :stuck_out_tongue:

In series, so 4.8V, 500mAH available when charged.

Yah but I am wondering if I use just one battery will each have 500 mAH or 250?

500

So if I am not mistaken putting two 500mah and 300mah NiMH cells in series will result in a 4.8 volt 400mah battery? Sorry for the nooby questions

No, the lower rating will limit it. 300mA.

trellsbells2:
I have two Ni-Mh batteries enclosed in plastic... they say they are 2.4 volts 500mAH. Does this mean that each one has 500mAH or 250mAH? They are in series by the way.
THank You :stuck_out_tongue:

This doesn't sound quite right. A single NiMH cell is 1.2V, so the 2.4V should be referring to a
series combination. 4.8V like Bob says would only be true if there are actually 4 cells in series.
You better take a DMM and measure what voltage you actually have, before trying to use.

Also, the 500 and 250 mAH values don't make any sense either. NiMH AA-cells run 1800-2500
mAH, and even AAA-cells run 600 mAH. It should be obvious from the size whether you have
AA or AAA. Other possiblity is 1/2 AA.

You should actually be able to tell how many cells and which size they are even if covered
by plastic shrink.

A Nimh cell is 1.2 volts. So it is more likely that you have two 1.2 volt cells in series for a total of 2.4 volts.

To actually have 4.8 volts, there would have to be 4 cells in there somehow.

CrossRoads:
No, the lower rating will limit it. 300mA.

Even worse, you'll destroy the 300mAh cell in normal use - never put unmatched batteries in series.

It could be:

That's 4 cells, giving 4.8V at 500mAh. But, because of the way the plastic stretches it makes it look like there's only 2 cells in there.

http://www.pdfdoc.ru/batteries/batteries-and-chargers/nimh-rechargeable-batteries/coin-amp-button-cells-rechargeable/battery-nimh-4-8v-500mah-4-v500ht-55750504012-702-0755

Well, that solves one problem, how to have 4.8V at measly 500 mAH. These are bizarre packs
with oval shaped "button" cells, never seen that before. Apparently there are 4 buttons, on
2 sides with 2 buttons each mounted one above the other. Probably used in european wireless
phones, etc.

There are also 1/2 AA's with 500 mAH, and N cells with only 360 mAH,
http://www.completebattery.com/index.php/rechargeable-dry-cells/nickel-metal-hydride/1-2-aa-flat-top-nimh-500-mah.html
http://www.completebattery.com/index.php/rechargeable-dry-cells/nickel-metal-hydride/n-cell-nimh-flat-top-1-2-volt-360mah.html

This one says on the package, 2/3 AAs,

Maybe ok for very low power apps, but NiMH AA-cells having 2200-250 mAH would be more
appropriate for general apps.