Archive for June, 2010

Potato and Nano-Tech Battery Technology

Commenting on a Google Buzz post about boiled potato batteries for emerging nations, a friend related how impressed he was with his electrical drill battery pack. Being the type I am, I replied enthusiastically with the following …

That will be the ‘A123′ branded (inside the pack) Lithium Iron Phosphate (LiFePO4) tech, heavily used by Dewalt. I have two 4-packs of those. Each cell have a nominal voltage of 3.3V and capacity of 2300mAh.

Far as I know, A123 were the first to use nano-laser techniques to make the substrate for the chemicals to rest in. They still hold tight to their patent, so I don’t think anyone else is doing it exactly that way yet. (A123′s primary target market is electrical vehicles.)

But there’s a whole new generation beyond that now, back into the lighter weight, more power for size/weight Lithium Polymer stuff. These are known as the ‘Generation-3 Li-Polys’ or simply ‘G3 packs’.

Lithium polymer cells typically do not have a (heavy) hard outer casing like the A123 cells. They are also rectangular so as not to ‘waste’ so much space, and have a nominal cell voltage of 3.7V vs. 3.3V. In the past, the G2′s and prior could not handle the type of charge current the A123′s could (by far) and had a much shorter cycle life. But that gap has really been narrowed won now with the G3 tech. The new G3 packs are very, very cool — especially when combined with 3-phase electric motors with total efficiency (including controller electronics) approaching 90% in some cases!

My Align(tm) T-Rex 500 Helicopter runs on a G3 2600mAh 22.2V pack (6-cell or ’6S’ as they’re known). It puts out about 300 Watts of mechanical power during average aerobatic flying manoeuvres, peaking almost a 500 Watts when pushed hard (at about 75% electrical efficiency if I recall correctly). Flight times are about 5 minutes — and that’s more than enough for my nervous system I can can assure you!


A similar version to what I have. It’s a very fun machine. But I’d just *love*
to have a T-Rex 700E! I’ve seen the 600′s fly and they’re so amazingly
stable and ‘floaty’. The 700 must be awesome.

Amazon patent ‘social networking’. WTF?

Oh dear. But how not surprising.

Not to be outspoken or anything, but …

I finally gave up on the patent system completely in late 2000 when I learned from a friend that the start-up company he worked for was under attack by a competitor who had somehow patented the idea (only recently at the time) that you could determine if a particular cellular comms module ‘had coverage’ by assessing the voltage on the signal strength (RSSI) pin of its radio chip. DUH. Being as that’s the only reason the chip manufacturer put the signal there in the first place and, besides the same standardised signal having been present on hundreds of radio chips and interfaces for many years, they had also fully (publicly) documented its purpose in this instance. So it all seemed a pretty clear case of an invalid patent.

But the start-up spent over NZ$70,000 of investor funds trying to get the judge to see that simple fact before giving up in disgust. As I recall, they continued with the product by adjusting the code to simply see if a call could be initiated as the method of determining coverage in boolean fashion. (And set about publicising that fact in the public domain as far and wide as they could so as to foil the rogue patent attorneys and their questionable client.)

Flip the roles around of course and you’ll find thousands of highly expensive, completely valid patents begin reduced to worthlessness for the same legal costs reason.

That’s just one of thousands upon thousands of similar stories since patents began. The original idea was good. I invent a bicycle and patent the two-wheeled form of transport. You invent the flip down stand so the thing doesn’t need a lamp post to stay parked upright. You pay me a licence for the original idea, I pay you a license for the nifty advancement, and we both go on to manufacture better bicycles. Now everyone, not least the consumer, wins. But long gone are those well intentioned ideas it seems.

Now you have this nonsense from Amazon as reported reported by PC World — Facebook, stop what you’re doing: Amazon has patent for ‘social network’.

In my perhaps not so humble opinion, the patent attorneys responsible for this embarrassment to all things good in the human race should be lined up and shot … or at least laughed at and ignored. Personally, I’d rather invite the tax man to dinner than partake of a single piece of bread with those low-lifes.

Patents seem to me today as little more than a tool used by the greedy to stay (or hopefully fail to get) wealthy.  Frankly, I don’t understand why anyone pays them any attention any more. Oh yeah. Legal costs of not doing so. I forgot. What a crock. *shrug*

Long live open standards and open source!

Another pingback test

I’ve enabled XML-RPC protocols on the company blog. This might make pingbacks work over there. Somehow I dout it, but here goes nothing …

Here’s the link to the pingback post on the company blog.

Pingback. What is it?

This is really just a test post to check that pingbacks are working between this, my personal blog, and ‘that’, one of my company blogs. (See below.)

WordPress is said to support pingbacks automatically. So, when I mention my blog post over at NZ Hosting’s blog, a comment should end up over there automatically — having been automatically verified as to this post actually containing a link to the blog over there. Clear as mud eh?! :P

I’m going to add a second link to a blog post where I first learnt how both pingbacks and trackbacks work, without which I’d not be writing this anyway, so it seems only fair. :D

Assuming this works, I’ll be fairly impressed. But I have to say, I can already see a couple of potential ‘gotchas’.