Can the HDD be replaced with 2 SSD with out disassembling the optical drive section?

Is there a way to replace the internal HDD (currently a 1TB HDD) with, for example, 2x2TB M.2 hard drives WITHOUT disabling the internal optical Drive?

Thanks

There are bateries labeled as "A1322" but marked as "High Performance" and rated 76.56WH/11.6V. Also sold as replacement for the MacBook Pro 13" mid 2012 Model A1278. Does the different rating, in particular the voltage, is compatible? Does it really provides some extra "performance" in any actual way?

Thanks

Does the optical drive has to be extracted? if the original drive is replaced by a slimmer SSD drive can the secondrive be inserted next? (Like stacked) Or the Y cable from the kit does not support the second SSD drive if the optical drive is still attached?

Thanks.