23A is the battery type. It has nothing to do with the current (Amps) or capacity (Ah). A typical 23A-type battery has a capacity of around 35-40mA. It also has a maximum current of around 2mA constant. So it won't deliver 400mA but if it did it would only last for around 5 minutes before it was dead.Now you see why we need links to the actual components.Steve
Question:What is energy storage (milli amp hour or mAh) of these batteries?Answer:55mAhBy Amazon Customer on 04 May 2018
The pump is not a problem - 15 mins every 3 days. That's about 0.033 Ah per day.
The Uno is a major problem - it's minimum draw is about 45 mA, 1.08 Ah per day. So in two days your battery will be completely dead just from the draw of the Uno.To lower your power use consider switching to a Pro Mini. After removing the regulator and the power LED you can go down to the µA range, so no problem there.Please note that the capacity of this lead/acid battery is hardly more than that of a pack of 8 AA alkaline cells or 3 LiPo 18650 rechargable batteries. Since 15 minutes is 1/4th hour: 400mA/4/3 days=0.033A=33mA. Is that what you did? so 400mA is actually 400mAh ?