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The A23 battery is rated at 55mAh. Your draw is 430mA. That's much more than this small battery can handle - it will die in about 7 minutes.

I wasn't able to quickly locate internal resistance data for A23. That said, this battery is composed of a stack of small 1.5V coin cells internally; supplying 430mA is going to make the cell heat up, further reducing its life.

MORE: You clarified your run-time requirement, which we now understand to be up to 3 days, so 31Ah. That's a much larger class of power than even the largest common primary batteries. It will not be economical, let alone feasible, to use them. You should consider a rechargeable (secondary) battery instead, be it a sealed lead-acid (like a motorcycle battery), LiFePO4 pack, or similar.

There exists a possible off-the-shelf solution: use a 'power bank' type of product. Some even have 12V output capability, like this one: https://www.xtpower.de/Power-Bank-MP-50000

Speaking of which, if you have a bit of flexibility in your design at this stage, you can choose to leverage USB type C power delivery, which supports 5,9,15 or 20V. This would allow you to leverage the ever-increasing ecosystem of USB-C power solutions, including power banks and other secondary battery solutions (some of which even include solar charging.)

The A23 battery is rated at 55mAh. Your draw is 430mA. That's much more than this small battery can handle - it will die in about 7 minutes.

I wasn't able to quickly locate internal resistance data for A23. That said, this battery is composed of a stack of small 1.5V coin cells internally; supplying 430mA is going to make the cell heat up, further reducing its life.

MORE: You clarified your run-time requirement, which we now understand to be up to 3 days, so (at least) 31Ah. That's a much larger class of power than even the largest common primary batteries. It will not be economical, let alone feasible, to use them. You should consider a rechargeable (secondary) battery instead, be it a sealed lead-acid, AGM, LiFePO4 pack, or similar.

There exists a possible off-the-shelf solution: use a 'power bank' type of product. Some even have 12V output capability, like this one: https://www.xtpower.de/Power-Bank-MP-50000

Speaking of which, if you have a bit of flexibility in your design at this stage, you can choose to leverage USB type C power delivery, which supports 5,9,15 or 20V. This would allow you to leverage the ever-increasing ecosystem of USB-C power solutions, including power banks and other secondary battery solutions (some of which even include solar charging.)

The A23 battery is rated at 55mAh. Your draw is 430mA. That's much more than this small battery can handle - it will die in about 7 minutes.

I wasn't able to quickly locate internal resistance data for A23. That said, this battery is composed of a stack of small 1.5V coin cells internally; supplying 430mA is going to make the cell heat up, further reducing its life.

MORE: You clarified your run-time requirement, which we now understand to be up to 3 days, so 31Ah. That's a much larger class of power than even the largest common primary batteries. It will not be economical, let alone feasible, to use them. You should consider a rechargeable (secondary) battery instead, be it a sealed lead-acid (like a motorcycle battery), LiFePO4 pack, or similar.

There exists a possible off-the-shelf solution: use a 'power bank' type of product. Some even have 12V output capability, like this one: https://www.xtpower.de/Power-Bank-MP-50000

Speaking of which, if you have a bit of flexibility in your design at this stage, you can choose to leverage USB type C power delivery, which supports 5,9,15 or 20V. This would allow you to leverage the ever-increasing ecosystem of USB-C power solutions, including power banks and other secondary batteries.

The A23 battery is rated at 55mAh. Your draw is 430mA. That's much more than this small battery can handle - it will die in about 7 minutes.

I wasn't able to quickly locate internal resistance data for A23. That said, this battery is composed of a stack of small 1.5V coin cells internally; supplying 430mA is going to make the cell heat up, further reducing its life.

MORE: You clarified your run-time requirement, which we now understand to be up to 3 days, so 31Ah. That's a much larger class of power than even the largest common primary batteries. It will not be economical, let alone feasible, to use them. You should consider a rechargeable (secondary) battery instead, be it a sealed lead-acid (like a motorcycle battery), LiFePO4 pack, or similar.

There exists a possible off-the-shelf solution: use a 'power bank' type of product. Some even have 12V output capability, like this one: https://www.xtpower.de/Power-Bank-MP-50000

Speaking of which, if you have a bit of flexibility in your design at this stage, you can choose to leverage USB type C power delivery, which supports 5,9,15 or 20V. This would allow you to leverage the ever-increasing ecosystem of USB-C power solutions, including power banks and other secondary battery solutions (some of which even include solar charging.)

The A23 battery is rated at 55mAh. Your draw is 430mA. That's much more than this small battery can handle - it will die in about 7 minutes.

I wasn't able to quickly locate internal resistance data for A23. That said, this battery is composed of a stack of small 1.5V coin cells internally; supplying 430mA is going to make the cell heat up, further reducing its life.

The A23 battery is rated at 55mAh. Your draw is 430mA. That's much more than this small battery can handle - it will die in about 7 minutes.

I wasn't able to quickly locate internal resistance data for A23. That said, this battery is composed of a stack of small 1.5V coin cells internally; supplying 430mA is going to make the cell heat up, further reducing its life.

MORE: You clarified your run-time requirement, which we now understand to be up to 3 days, so 31Ah. That's a much larger class of power than even the largest common primary batteries. It will not be economical, let alone feasible, to use them. You should consider a rechargeable (secondary) battery instead, be it a sealed lead-acid (like a motorcycle battery), LiFePO4 pack, or similar.

There exists a possible off-the-shelf solution: use a 'power bank' type of product. Some even have 12V output capability, like this one: https://www.xtpower.de/Power-Bank-MP-50000

Speaking of which, if you have a bit of flexibility in your design at this stage, you can choose to leverage USB type C power delivery, which supports 5,9,15 or 20V. This would allow you to leverage the ever-increasing ecosystem of USB-C power solutions, including power banks and other secondary batteries.