Wow, my head is spinning. Too much voodoo RF magic to figure out while trying to keep register names straight in my head between platforms. Short names will be the death of me, since C89 31 characters have been available.
You cannot just buy any random rechargeable batteries or battery charger and this article explains why. I would follow the information given in this article carefully and I would always inspect the batteries for signs of corrosion, even neurotically. There is a reason why pump manifacturers say that rechargable batteries "void the warranty". http://blog.codinghorror.com/adventures-in-rechargeable-batteries/
I would do it though. But I would just be careful.
If you basically don't follow those instructions in that article, you will have rapidly discharging batteries that won't last in your pump
But yeah that battery charger is also a battery tester too, which is a good thing to have given the discharge rates of rechargable batteries. If you're not careful you can end up with dead batteries fast and you just wasted money.
Yeah about to test temp basal of > 6.4. Just feeling lousy today. 😞