I didn't realize Battery was so limited.

Still, the PP cost reduction does reduce costs a little and make your PP charge run out that much slower. 1-5 points of PP saved per spell adds up fast if you're casting that spell every turn, like my Acid Balls in a greater undead vault.

I was worried about my Mana stat, so I tried to avoid HP casting. I had like 1200 PP by the time I got to the Mana Temple, so both there and on D:48 it was quite effective to pray for power.