I just got one of these bad boys...10,000 mAh's!
http://www.onlybatterypacks.com/showitem.asp?ItemID=10953.8
Very nice 70 watt bundle of power. If deck draws 7 watts, then this pack good for ~10 hours running time.
Designed a real 'bad boy' 12 D cell power sled for SD decks that's surprising light weight.
Filled with regular heavy duty Alkaline D cell, and you've got a
250 watt super capacity pack, but weighing all of
4 pounds and running
same 7 watt deck for 35+ hours! Great for rural festivals and remote expeditions where heavy batteries, recharging/swapping batteries is best avoided with highly reliable alkaline. Renewal time: 2-3 minutes to install fresh cells.
If instead wanting a
rechargeable pack, then loading 12 same NiMH D cell as in 70 watt pack
gives lower capacity 150 watts,
heavier weight than alkaline 250 watts, and with 7 watt deck, running time expected is ~20 hours, with recharge time likely 6-24 hours.
Cost of extra capacity D cell NiMH is not cheap to buy, and then there's need of charger(s). But investment is good value if recording urban locations with frequent overnight for recharging gear, and over many years time rechargeable pack is likely renewable/reliable enough to last the
life of the deck, but mostly true only with careful charging/storage management practices.
BD-12T is
similar to BD-8 construction, but with power plug for SD decks, and 1-cell position longer holding 4 more cells than BD-8
BD-12T specifics at:
www.sonicstudios.com/batsys98.htm#bd12I know many here also are DIY, and can wire your own battery sleds together so take a look a photo of BD-8 for
unique construction details
Notice the internal thermal
safety fuse that's very important to avoid smoke/melting stuff if something gets shorted.
Notice white self-supporting molded plastic battery sled that
is very rigid so cells, even heavy NiMH, don't move to momentarily disconnect to cause recording faults with battery sled flexing.
These white
self-supporting battery sleds are no longer available from large north American/European parts distributors (maybe surplus/special order), only
non-self supporting black poly plastic types
are now stocked. And these mostly needing to be attached to something rigid to keep cells from moving around. So if wanting to make your own, attach sled to stiff metal plate or some other rigid surface.