Understanding Battery mah on 3 units

[Jimi Mack]

I have several PV's and I am trying to understand battery mah and how it relates to battery life. I have a VP1, Protege and eGo. I know the mah on each battery is not always as listed, I follow this so far. What I am having a hard time getting my head wrapped around is the actual time of vaping between the units.

My ego will last me any where from 6 to 8 hours, the VP1 about 2 plus and the Protege about maybe 3 - 3 1/2 hours. Now we know the VP1 has a mah at about 350, the Protege with a 900 (we understand it is not actual) and the ego with a 651 mah. Now with the protege being listed at 900 but lets say a real 700 - 650, should it not last almost as long as the ego?

As a side note, all batteries are new and fully charged. I just do not understand why the Protege has a closer working time to the VP1 than the ego? I do average about 5ml a day and have kept it at that each day when I was trying to compare the battery life on each unit so all would be even.

 

[Quexos]

Theory: Because according to that one fellow (who's name I forgot) who tested the actual voltage of these batteries, the ego batteries only put out around 3.07 or something volts? And maybe the one in the protege is rocking 3.71?

 

[mendnwngs]

mAh is Milliamp Hours, so a 600mAh should, in theory provide 600miliamps for 1 hour before its dead.

In practice, however, this is rarely the case. The faster you drain the battery, typically the less mAh it will deliver before its dead. a lot of battery manufactures figure out their batteries mAh by discharging them slowly, usually a 1/20th C. (1/20th of the capacity) so this discharges the battery over 20 hours, and such a slow drain is "easier" on the battery, so it will give more mAh before dying.

Some say they do this to bolster their products numbers, but I think a 20 hour discharge time is not unreasonable for standard uses for these batts, but our use of them is pretty rough on them

A standard atty, on a standard 3.7V battery can draw 1,200 to 1,800mA while were actively puffing.

Some batteries have lower internal resistance than others, the lower the internal resistance, the better the battery is at handling high-current loads, and the more "oomph" you'll get out of it (versus another battery with higher internal resistance, but the same mAh)

To add more confusion is the matter of voltage. Using the same atty, you will use more mA per puff on a higher voltage battery than you will on a lower voltage one.

dont know if i answered anything, or just posted a bunch of confusion, LOL..

-Jason

 

[D103]

mAh is Milliamp Hours, so a 600mAh should, in theory provide 600miliamps for 1 hour before its dead.

In practice, however, this is rarely the case. The faster you drain the battery, typically the less mAh it will deliver before its dead. a lot of battery manufactures figure out their batteries mAh by discharging them slowly, usually a 1/20th C. (1/20th of the capacity) so this discharges the battery over 20 hours, and such a slow drain is "easier" on the battery, so it will give more mAh before dying.

Some say they do this to bolster their products numbers, but I think a 20 hour discharge time is not unreasonable for standard uses for these batts, but our use of them is pretty rough on them

A standard atty, on a standard 3.7V battery can draw 1,200 to 1,800mA while were actively puffing.

Some batteries have lower internal resistance than others, the lower the internal resistance, the better the battery is at handling high-current loads, and the more "oomph" you'll get out of it (versus another battery with higher internal resistance, but the same mAh)

To add more confusion is the matter of voltage. Using the same atty, you will use more mA per puff on a higher voltage battery than you will on a lower voltage one.

dont know if i answered anything, or just posted a bunch of confusion, LOL..

-Jason

Thanks Jason, while I'm no electrician, your information did make sense to me and has helped me understand a little better why I get different performance from the three different KR808D-1's I have. If I'm understanding you correctly it is more a technical issue rather than, one or the other is just 'crap' or in some way 'defective'. That does help me out.

 

[Drozd]

to add to Jason's post
You have to factor in the resistance of the atty/cartomizer, the C rating of the battery, the voltage that you're vaping at, and the mAh rating of the battery...and even the manufacturer of the battery..

ok lets say you're using a 510 atty
that's an Amp draw of about 1.61A at 3.7V (and about 1.35A at 3.1V (the eGo))

now it comes down to the batteries and their C ratings.. you can assume a C rating on a battery of 1 unless otherwise noted *fire brands are 1.5C, AW are 2C...)
max drain of the battery is figured by multiplying the mAh rating by the C rating and dividing by 1000....and the 60min in that milliAmp hour by the C rating..
when your Amp draw is at or above the max drain rating of the battery you're actually stressing and damaging the battery which reduces life and the # of times it's charged

so now the batteries:
The eGo....max drain of .65A....overstressed battery..but
1350 (mA of amp draw) / 651 (mAh rating) = 2.07C..60min/2.07= 29min or 1739sec (if ran continuous)

the VP1...depends on which 10440 battery you're using by which manufacturer
assuming the 350mAh Ultrafire: max drain rate of .53A.... again overstressed battery..but
1610/350= 4.6C...60min/4.6= 13min or 73sec (if ran continuous)

and then the protege
again it depends on battery and manufacturer of that 14500 here I'll list 2 examples
Ultrafire 900mAh: max drain is 1.35.. again overstressed...but
1610/900=1.79C...60/1.79= 33.52min or 2011 seconds

AW 750mA 14500: max drain is 1.5A.. still overstressed...but
1610/750= 2.15C ....60/2.15= 27.91min or 1674 seconds...


So math wise....on brand new batteries all around the Protege SHOULD last longer than the eGo...
what you have left is the variables of how long of hits are you taking and how many times you press the button and break up those seconds... as well as how much damage the battery has taken and how much the capacity has been reduced on each of them due to overstressing the battery...