Hybrid Battery Performance

I have a 2008 Prius with 118,000 miles and don't currently have any codes for the battery. However, I have known for some time the hybrid battery performance has been degrading. It is often low (1 purple bar) after sitting for 12 hours or so even though it was in the green when last parked. Of course, it runs on engine power only until it recharges during the first few minutes of driving; it also recharges and discharges quickly.

I finally decided it was worth looking into and connected my scan tool. With the current charge at 25% I found a min block voltage at 14.98 and a max at 15.21.
01 - 15.11
02 - 15.21
03 - 15.10
04 - 15.08
05 - 15.05
06 - 15.06
07 - 15.13
08 - 15.03 (this one was flip-flopping to 14.98)
09 - 15.16
10 - 15.08
11 - 14.98
12 - 15.04
13 - 15.10
14 - 15.15

Based on what I have read here it sounds like I don't have bad modules but probably the individual cells inside need to be balanced. Am I understanding this correctly and if so what is the best charger & setup currently available to do this?

 

Thanks for the responses.

The aux battery has been replaced within the last year; it shows good voltage after sitting overnight and holds a full load without issue.

I looked at that charge/discharge system from Hybridautomotive and this being a spare vehicle I wouldn't put that kind of money into specialized equipment that is only good for it. I should have been more specific, I'm more interested in removing the battery and working to balance the individual modules one at a time. I understand this will take longer but downtime isn't an issue for this vehicle but I would like to fix & keep if possible. However, $600 just to get a year or so isn't much bang for the buck and I would replace the pack before going that route.

I saw a system from one of the posts here that looked more like a computer power supply for one module at a time but wasn't sure if it's the most current and best option. Any advice on that?