its the normal cmos 4v (4v? i am not sure) battery like these from pc-tower mainboards
http://images.google.at/imgres?imgurl=h ... e%26sa%3DNu can get it everywhere for a few bucks...
it kills definitive the mpc2,5k!!!!
had it also.
the 2500 is way to overpriced for what it is.
when u really want an other mpc (with the best cost/performance ratio) get the 1k with jjos.
i had it also, sold it cause i didnt like the small pads. bought a mpc2,5k (also with jjos) and sold it after 1 month cause i was very disapointed:
stiff pads, ugly design and everything else was the same as on 1k (but for the double price)
then i bought the 4k nearly for the same price as the 2,5k and now i am happy!
for me the 4k is the best LIVE mpc and the best studio mpc with the most possibilities from the whole serie:
u can tweak everything, go nuts with the fx, q.link sequences, filters etc. etc. etc...
best part for me is that the 4k is a whole z-serie sampler, so u can load whole akai,emu (whatever)disks, plug in a usb-keyboard and jam arround.
and in 24bit!!! (u hear the difference)
so..... its your decision....