LR atty hard on Batteries?

Status
Not open for further replies.

orion7319

Senior Member
ECF Veteran
Verified Member
I haven't noticed an extra drain on the batteries using the LR attys. I primarily use my 650mAH batteries just because I like the size and I am getting 8-10 hours with it. I have a couple of 1000mAh batteries and I keep one of those with me at all times as a backup. I figure that should be more than enough battery power to last for quite a while.
 

Aaaron

Full Member
Jan 12, 2011
22
0
Los Angeles
The best you will get out of an eGo battery is 0.65A or 1A that is with 650 and 1000mAh respectively. A 1.5 LR draws 2A on an eGo battery.

This is incorrect.

The ratings 650mAh and 1000mAh do not state the maximum current output of the battery. Rather, they state how long the battery will last given a particular current draw. For example, a 650 mAh battery can deliver 650 milliamps (0.65 amps) for one hour. The 1000mAh can deliver 1000 milliamps (1 amp) for one hour. So, if you're using a 3.7 Volt 1000mAh battery, it works out like this:

I = current (amps)
V = voltage (volts)
R = resistance (ohms)

3.7 volts across a 1.5 ohm atomizer:

I = V / R

I = (3.7)/(1.5)
= 2.47 amps = 2 470 mA

This is the current that the atomizer will draw from the battery. To find out how long the battery can deliver this current, you do the following:

time (hours) = mAh/mA
= (1000)/(2 470)
= 0.405 hours

Therefore, with a 1.5 ohm atomizer, a fully charged 1000mAh 3.7 volt battery will last for 0.405 hours (24.3 minutes) of constant use.

Separating this 24.3 minute time frame into 5 second "draws,"

24.3 minutes * (60 seconds)/(1 minute) = 1458 seconds

1458 seconds * (1 draw)/(5 seconds) = 291.6 draws

You can do your own math based on how often you tend to take a draw to determine how long it will last you. My own personal experience is that, with a 650mAh 3.7 volt battery, using a 1.5 ohm atty lasts me about 24 to 36 hours while using the standard 2.2 ohm atty lasts me about 48 to 60 hours.
 

Switched

ECF Guru
ECF Veteran
Feb 18, 2010
10,144
2,544
Dartmouth, NS Canada
This is incorrect.

The ratings 650mAh and 1000mAh do not state the maximum current output of the battery. Rather, they state how long the battery will last given a particular current draw. For example, a 650 mAh battery can deliver 650 milliamps (0.65 amps) for one hour. The 1000mAh can deliver 1000 milliamps (1 amp) for one hour. So, if you're using a 3.7 Volt 1000mAh battery, it works out like this:

I = current (amps)
V = voltage (volts)
R = resistance (ohms)

3.7 volts across a 1.5 ohm atomizer:

I = V / R

I = (3.7)/(1.5)
= 2.47 amps = 2 470 mA

This is the current that the atomizer will draw from the battery. To find out how long the battery can deliver this current, you do the following:

time (hours) = mAh/mA
= (1000)/(2 470)
= 0.405 hours

Therefore, with a 1.5 ohm atomizer, a fully charged 1000mAh 3.7 volt battery will last for 0.405 hours (24.3 minutes) of constant use.

Separating this 24.3 minute time frame into 5 second "draws,"

24.3 minutes * (60 seconds)/(1 minute) = 1458 seconds

1458 seconds * (1 draw)/(5 seconds) = 291.6 draws

You can do your own math based on how often you tend to take a draw to determine how long it will last you. My own personal experience is that, with a 650mAh 3.7 volt battery, using a 1.5 ohm atty lasts me about 24 to 36 hours while using the standard 2.2 ohm atty lasts me about 48 to 60 hours.

It was the shortened version. Even at a 1.5 C rating that only equates to 0.875A and 1.5A respectively, far short of the 2.47A required. When the C rating is unknown 1 is utilized.

Over stressing a battery leads to increased internal resistance and this shortens battery life. Another thing that has been know to happen on the eG0 PCB is the use of LR attys have a tendency to pop the mofset.

Ohms law is a wonderful tool, but there is more happening in e cigs than just a quick quote of Ohms law IMHO.
Vape Central: Battery - FAQ
 
Status
Not open for further replies.

Users who are viewing this thread