Hi guys,
so I'm trying to power a Geiger counter project with a 9v battery and a 12v 45mA solar cell. The power draw for the arduino and sensor circuit is right around 32mA at the dc-dc converter, Vin. I'm using a 9 to 5v buck.
the solar cell is:
http://store.sundancesolar.com/12-0v-45ma-solar-cell/
the battery is:
http://data.energizer.com/pdfs/l522.pdf

Will this work for my project?
Will i need to have a voltage regulator circuit to prevent overcharging?
Are there any other things that i need to consider?

Thank you

 

That is a non-rechargeable battery. You'd have to go to a NiMH, NiCad, or rechargeable lithium battery. If you do go lithium... get a lithium charger on it. Don't just jam a voltage onto it.

 

Oh i didn't even notice that.

 

Oh i didn't even notice that.

I did a double take but a good way to cheat on if it is rechargerable is look for a charging rate (graph or number)

 

do you have a battery that you would recommend?

 

oh i linked the wrong battery
http://data.energizer.com/pdfs/nh22-175.pdf

 

oh i linked the wrong battery
http://data.energizer.com/pdfs/nh22-175.pdf

1. She's a NiMH. Here's info on charging that bad-boy. When I do these battery projects, I do the designs around a charging IC since I'm too lazy to design my own charging circuits. Something like this.

 

Yes, you need a Ni-MH charger IC.
Your original idea to charge it at 2.6C then over-charge it with a very high trickle charge current will quickly destroy the battery.