ex go txt batteries not lasting and bubbling

[pberm1962]

my 2014 ez go txt 48 volt golf cart batteries are losing their charge fairly quickly this year compared to last year. the age of the trojan 8v batteries i believe is 8 years old as the stamp on the negative terminal is E4 ,the E indicating 5th month, the 4 means year 2014. i took the 6 Trojan DC-8V batteries out of the cart and stored them in my garage where it doesn't freeze over winter.i charged each battery individually and checked/added distilled water to a bit above the plates- equally for each battery. i fully charged the batteries and they Bubble/gurgle during charging fully to around 52.5 volts. after charging the batteries they continue to gurgle non stop.
my issue is i am losing power in about 20 minutes of run time when last year i would get about about 40 minutes of run time. i am able to drive the cart into the garage before they completely die and in that weak state i am getting around a 50 volt total reading. any suggestions,ideas why my batteries die so quickly now? I realize they are 8 years old. they may be at end of life. is gurgling during or after charging an indication of a problem? should I disconnect all batteries from each other and read each battery individually?

[Volt_Ampere]

They are worn out. Eight years is much longer than normal life for those batteries even if they are well cared for. Time for new ones.

[ojo]

Some gassing/bubbling in the final state of the charging process is normal on FLA batteries and this will increase at higher age of the batteries ( older batteries needs more watering also ).50v isn't that bad, but probably drops under load significant?