Confused

So, my 2005 just hit 294k miles, and its starting to really show its age. for the last few months the battery has been discharging extremely quickly and charging extremely slow.
I had assumed maybe one of my battery cells was bad and i could just replace it, but to confirm i downloaded Torque Pro just to check the voltages of each block before i took the car apart.
i had expected to see one block significantly lower than the rest(or at least a little lower). but after letting it run during my half hour drive to work, it reported fairly even numbers across the board.

Does this mean i just need an entirely new battery instead of just replacing individual cells, or should i tear the whole thing apart and actually check the voltages of each cell individually, or could this be indicative of another issue entirely?

 

mostly because if the battery is still good, i'd rather wait on spending the $1,600. i dont want to end up with a new battery not being the fix until i know for sure. corrosion could definitely be a possibility with the age.

should i just take it apart at this point and see what im dealing with.

i should also note, there is no check engine light, and no red triangle at this point. and Torque did not find any pending codes

 

Would this have such a drastic affect on charge rate? and can i actually put gen3 cells in a gen2?

 

it was about the same when i checked it first thing, but i will do it again tomorrow morning to be sure