Hi, I’m having trouble powering my ATTiny85 device with a 9V battery. I’ve read that 9Vs suck, but they are the perfect size and shape for this particular device and I would like to find a way to use them.
The problem is that ONLY the older red Duracell ProCell batteries run the device properly (see pics). Any other battery, including the newer yellow ProCells, don’t work. They give the unit power (I can still press a button and the LED lights up), but the program runs erratically.
Why is this? I can’t find any of these red ProCells anymore…actually, I DID find a new one in a store, but it didn’t work either! Only older red ProCells work for some mysterious reason.
Please shine the light on my ignorance!