Since only small stocks are held to avoid deterioration in storage, that will be at least the later 10 Ah Li-ion made by Phylion which is very much better than the earlier ones from mid 2007 and before. I think the new Sanyo made one will be superior, but it's too early to tell exactly how long each of these types last.
The improvements in the chemistry are continuous as soon as they become available and are proved. A bit like computers and digital cameras, when you buy one it's out of date by the time you've unpacked it! That's probably why the model labels only indicate the construction rather than the chemistry, the latter codes being marked on the cells.
If you can tell me the serial number with prefix below that model number, it has an alphabetical prefix and a very long number beginning with 1, I will be able to tell you more though.
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Last edited by flecc : 11th May 2008 at 15:19.
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