Does it not look like the same battery packs being sold on sites that advertise in this forum?
http://www.prontobattery.com or
http://www.prontowizard.com? If so, then order one of those.
Philips used the same battery pack in the Marantz RC9200, RC5200, TSU6000, and the TSU7000 so I would suspect they used the same one for the 3000 but I could be wrong. However, since you can order the DS3000 and it also works for the TSU7000, the battery packs are very very likely to be the same.