Battery internal resistance

[jlwilder40]

I have a Ultrax and Powerextra battery. The Ultrax IR readings are cell 1- 6mohm cell 2-2mohm cell 3-2mohm cell 4-7mohm. The Powerextra battery readings are cell 1-8mohm cell 2-2mohm cell 3-2mohm cell 4-6mohm. Does anyone know why cells 1 and 4 are always higher in IR readings than cells 2 and 3?

 

[Eagle's Eye Video]

I am no battery expert, but maybe it is related to cells one and four being the cells where the negative and positive terminals are.

 

[MM1992]

I'm no battery expert either, but I've noticed on my batteries that are starting to show their age that cells 1 and 4 will be the last to reach voltage when they are beging charged or put into storage mode.

 

[Sunshine State]

I have a Ultrax and Powerextra battery. The Ultrax IR readings are cell 1- 6mohm cell 2-2mohm cell 3-2mohm cell 4-7mohm. The Powerextra battery readings are cell 1-8mohm cell 2-2mohm cell 3-2mohm cell 4-6mohm. Does anyone know why cells 1 and 4 are always higher in IR readings than cells 2 and 3?

Have you formed a preference between the Ultrax and Powerextra batteries? I want to purchase two more and looking for advice from someone who has worked with both. Thank you!

 

[PatR]

They are the same performance wise with the only real difference in price and shipping cost.