Recently I came across an old battery powered travel razor that I had misplaced. To my delight, and simultaneous horror, I found a pair of the old style L91’s inside, expiration 2009. The razor ran strongly when I turned it on, and I measured a voltage of 1.62
I was tempted to run a discharge cycle on them to determine remaining charge, but not knowing how much usage they had seen, it would not have meant a lot.
Best guess is that these were manufactured in 1998 or 1999.
It's always nice finding something with batteries in it that have been so well aged and not leaked all over the place.
Sorry this may be a little off topic.
On the topic of the AA Lithium Batteries. I have been using them in my insulin pump from Medtronics. They recomend
the use of Energizer cells in the pump. The older pump used one AAA and the new pump used 1 AA cell. I can use a
Lithium or an Alkaline cell. They do however say not to use the Ni–MH. I have in the case used a Ni–MH in a pinch and
found that it did ok other than it dropped below the alert for a low batterie much faster than the Alkaline. For the longest
service time Lithium cells can't be beat. Also they recommend only to use Energizer cells. In my life it seems that the cells
from Duracell at least to me seem to leak more often than Energizer. This would be a real issue with any medical device and
for anyone that is stockpiling for use in an emergency. That said I try to buy my Energizer AA Lithium Batteries when on sale
and store them for later use as I seem to use quite a few in a year. I also find myself reaiding my stock for things like remote
controls and outdoor weather sensors and have had good luck in both cases for life span and leakage.
The only two questions I really have are : What is the best storage conditions for the Lithium cells and do the Duracell when
low tend to leak more often or is that just bad luck on my part?
Thanks for putting up with my rambling.