battery replacement for my '03 A4 - stock? aftermarket?

i replaced w/ the duralast for autozone. works great, way lighter than stock, and fits perfect.

Went with Bosch at Pep Boys. Took the mechanic an hour and a half to remove/install battery!

Interstate MTP-91 Megatron Plus with 85 mo warranty and 700 CCA

x2...and pretty cheap (compared to OEM)

If the OE battery is not totally shot yet, , adding distillied water to ...
 

restore the electolyte levels in the individual cells will extend the functional life span of the battery a lot. On the OE battery, remove the stickers on the top, then remove the cell caps to refill. The level in the cells should be about 1 inch below the top of the battery, no lower. The OE battery with the Magic Eye, is not a maintainence free design, it needs to be topped up with distilled water.

HUGE 2nd, or +1, or whatever. Interstate batteries are awesome
 

Though expensive. That battery is like $120? Im pretty sure that every car that me, my brother, and my father own uses that exact battery, and have never had a single issue in years and years of use.

i got the optimus prime and it seems to kick megatron's azz