Newbie needs help!

[Nbanks02]

So as the title says im new to this hobby and new to the website.

Ive bought a couple of drones to get into the hobby but im not the most technical guy in the world, my most recent issue is with my Eachine trashcan, I can barely get 1 minute flights before the batteries out of juice this is when i use the stock batteries or some that i bought separately. They are 40/80c 300mah and less than a minute with 1 or two plugged in

 

[Nbanks02]

This is the battery set up i have

 

[HighTechPauper]

Welcome @Nbanks02, I would check 2 things...
First, are you sure that you have a good 4.35-ish volts on the batteries after charging? What are you using to charge them? What happens after 1 minute, does it fall out of the air and die? Also, what is the voltage on the battery after that?

Second, the JST-PH2.0 connectors on the quad are the "folded" pin type and start having connectivity problems fairly quickly, you may want to try and find a "solid" pin style connectors to replace them with.

It is possible that your flying skills are so good that you can rip hard enough to kill the battery in 1 minute of all out getting it, could that be a possibility?