Begingroup btw my ultimate goal is to have the 9v battery power three leds. Negative to negative and positive to positive.
Wiring Batteries In Parrallel
9v battery in parallel. Forward voltage is 30 36 volts to be wired in parallel the third will be a blue led 34 38v 20ma in series with the parallel circuit of the il604s. So if my calcs are right the resistor for each of the il604s parallel with each other should be 50. To join batteries in parallel use a jumper wire to connect both the positive terminals and another jumper wire to connect both the negative terminals of both batteries to each other. You should be able to get that to about 90. One 9v battery will give you somewhere between 120 and 200 hours of illumination with the simplest circuit a series resistor. You can parallel these batteries but there will be some mismatch and they wont share the load equally.
Unlike wiring batteries in series when batteries are wired in parallel the voltage does not increase the output voltage is the average voltage of all batteries in the circuit. The basic concept is that when connecting in parallel you add the amp hour ratings of the batteries together but the voltage remains the same. A much better solution is to use a buck switcher instead of the 7805. The 2nd config is 4 parallel connections at each battery end also 2 rows of 4 batteries each row connected in series and of course the 3rd image is 3 parallel connections with 3 batteries connected across their and terminals and a single row of serial connected batteries to make 48v. But these arent rechargables so it would partly work but mostly be a waste. You can connect your load to one of the batteries and it will drain both equally.
But as a rule paralleling batteries is not good because you cannot control the above requirement. As it is now your power supply is only 56 efficient. Paralleling batteries can be done if they are both new and equal type. Paralleling is a way to get more currentby paralleling them you are making. For example if a 3v and a 9v battery were wired in parallel the output voltage would be 6v 93 divided by 2 however the current will be total amperage of all batteries in the circuit minus any losses. Connecting multiple 9v batteries in parallel is fine for the most part but you would need to replace them all at the same time.
Two 6 volt 45 ah batteries wired in parallel are capable of providing 6 volt 9 amp hours 45 ah 45 ah. If you have one that is partly drained connected to a new one then the new one will drain trying to charge the old one. Two are microtivity il604 5mm rgb slow rotating led. With a good switching voltage converter circuit you should be able to get more than 600 hours.
Gallery of 9v Battery In Parallel
