Hi Roger,
>The Solara system could be configured as a text messaging 'wait until a slot is free' system.
Users doing texting need fast response. That said, I'd love it if it could be charged at a lower fee, too. No doubt we there are a lot more sales whenever anything drops in price. We'll see what happens in the future.
>I will stick my neck out here and label that a typical idiot committee decision.
Looking at the way my post was worded, OK, I can see how it sounded a bit unusual. I should clarify this a bit and mention that I would like to defend the SAR folks that specifically insisted on backup power (all SARSAT beacons have an nonrechargeable lithium battery that is never used until the alarm is hit – it's actually not out of the question to put a small secondary source into a commercial device, especially a much more power-efficient one like ours). The fellows in particular that told me this also include paratroopers that jump out of the back end of a Herc to save people in distress and the pilots that take them there. Canada has lost a number of aircraft and crews over the years and many have been injured and frozen in the performance of their duties saving guys like us. These guys know what can go wrong and only ask for what they know works.
Hi John,
>How long do those nickel metal hydride batteries last at say zero degrees compared to lithium batteries?
As for the internal rechargeable batteries, whether lithium or NiMH, there isn't much difference at 0 (Farenheit, I think you must have meant). But the types we use would still have about half of the capacity at that temp – it's when it gets below -20F that you really see a drop. If you were in trouble and warmed it in your coat and got it to even 32F, you pretty much have full capacity.
Non-rechargeable lithiums do also lose capacity in the cold, but no where near as much as rechargeables. That's also why we provide an external battery holder for nonrechargeable lithiums as an option. Right now, our first device is targetted for professionals in the back country on a daily basis that also need tracking and texting. We're working on a lighter design that is more conducive to backpackers. Part of the reason I posted here was to hear comments on what people would like to see. Seems you definitely have a vote for a unit with non-rechargeable lithiums that can be changed out by the user. Message heard!

