This might seem like a really dumb question, but can you connect two (2)
9-volt batteries (rechargeable or non-rechargeable).... (a) in parallel (for longer operation of a device I suppose), or (b) in series (to get double the voltage)??? I'm guessing the answer is yes, but I just need to be sure!I have a small plastic case with 12V circuitry inside it, and there isn't enough room for a 12v SLA battery. But enough room for two 9-volt batteries to be inserted. One 9-volt isn't enough power for the circuit, but thought if I can connect two of the 9-volt batteries in series, I might be able to double the voltage and get up to 17 or 18V .... which could then be rectified down to the required voltage.
No smart-ass replies thanks... Thanks in advance.
Jason.