I'm working on a wearable project that is really space constrained. Originally, I had planned to use a Li-Ion battery, but I opted out of it because the person wearing it won't be able to take the wearable off in case there is a catastrophic battery failure.
I would use a triple-A battery, but those are too large.
What battery can I find that is smaller than a triple-A battery, but still fits the following constraints:
- Safter than Li-Ion
- Smaller and lighter than triple-A
- Nominal voltage of 3.0V (I would be willing to use 2 1.5V cells if they are small enough)
- Charge capacity >= ~50mAh
- Capable of delivering up to 300mA in very short bursts for rf transmission (about 30 milliseconds). Otherwise the "resting" current consumption of the system will be on the order of 10μA.
I've found plenty of small batteries that satisfy one or 2 of these requirements above, but I can't seem to find one that fits all 5 except the 110mAh li-ion that I linked above.