It's not a Bonneville, but my '03 Monte Carlo SS is gone >8 years on the OEM AC Delco battery.

It IS starting to get weak, but even on an 8* morning this morning, it still got it started.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

My car had an Everstart Maxx (Walmart) battery in it when I bought it. 2005 was checked off on the label and it was working fine in 2011 when I swapped it out-- Not because it wouldn't start the car, but because I could no longer run my amps and sound system 20+ minutes while washing the car without it dying.

Nothing wrong with them IMO. I bought the same one to replace it, about $100.

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Inferno Red 2009 Dodge Caliber SRT-4 125k