Would this work for what we do (recorders, preamps), or is it just crap/wrong technology (lithium polymer)?
http://www.ebay.com/itm/18000mAh-Universal-External-Battery-for-laptops-Mobile-Phones-PDAs-iPods-/130691172867?pt=PDA_Accessories&hash=item1e6dcd0a03#ht_3274wt_1131
Pretty cheap.
Looks a lot like the Naztech PB15000
http://www.amazon.com/gp/product/B007URKIGC/
I have the Naztech, and it runs a hd-p2 with phantom power on for 14 hours.
If the eBay item is comparable, it's a good deal.
For what it's worth, Jerry Chamkis uses lithium polymers for the internal rechargeable option on the Aerco. He told me that they have a number of advantages (low self-discharge, lightweight, many charge cycles) but are quite particular about charging. They can explode or burst into flames if overcharged and can be damaged by discharge past a certain point. He emphasized that I should only use the charger that was designed to go with the batteries...
Thread here:
http://taperssection.com/index.php?topic=155567.0