multiple battery pack amp and voltage loading

[suprtrkr]

A question for the technical wizards, if you please. If I build a mod using two (or more) batteries in parallel, does this increase the available amp loading? That is, if I use 2 Efest purple 35a 18650's connected in parallel, I'll have a 3.7~4.2v battery pack with 70a available power? Similarly, connected in series, I am assuming I'll double the voltage, while the amperage will be equal to the amp rating of a single battery? That is, using a pair of the above described batteries, connected in series, I'll get a pack of 7.4~8.4volts at 35 amps?

Thanks for the help.

 

[drmarble]

That is mostly correct. I think the maximum amps drop a little for the series mode because you now have double the internal resistance of one battery. It is probably only a milliohm or three. The current has to pass through two batteries instead of one. The maximum amps might drop from 35 to 34. Someone with more experience could give a more exact answer. I only use 9.5 watts myself so only 3 amps max.

 

[edyle]

Yes;

In series you double the volts.
In parallel you double the available amps.

I don't recommend doing either using lithium batteries on handheld devices.

 

[suprtrkr]

My thanks to you both.

 

[Luke49783]

I don't recommend doing either using lithium batteries on handheld devices.

This is commonly done (in series) in OKR builds.

Just make sure that you start with a brand new set of batteries and keep them paired. Always charged and used together. If you ever separate the pair, don't pair them back up.

 

[suprtrkr]

This is commonly done (in series) in OKR builds.

Just make sure that you start with a brand new set of batteries and keep them paired. Always charged and used together. If you ever separate the pair, don't pair them back up.

That sounds like good advice. Thanks.