2007 A6 battery choice

[Scamp's Walker]

Battery has died and wil not hold a charge so looking for a replacement. OEM was Varta but understand new battery is Bosch. Needs to be 110Ah apparently and 520 CCA. Only exact replacement is current OEM at £188 but been offered a Varta I1 for £95.

Has anyone got any experience of the new Varta ones? Or should I bight the bullet and by the Audi one?

Also, understand battery's will immediatelynneed recoding, but also read that if I connect charger to battery under bonnet or connect jump leads to another car whilst removing the battery there will be no read to recode.

Is any or all of the above correct?

Thanks