Just bought an Energizer "Energi To Go" AUDIO power pack from Big Lots for $10. It included four Lithium AA Energizer batteries plus the power pack. It also came with an iPod igo adapter which is no use for the N810. So I now need to get the tip number A105 (or possibly the older A69) and it should work. Can't find the tip shipped for less than $10 so will try Radio Shack ("You have questions - We have blank stares") tomorrow and shell out $10 + tax. Ouch!

BTW anyone want the iPod adapter for free? I'll ship it to the US. PM me. It's the A61.