Hello Arduino peepz!
I have the circuit for our wireless fire alarm project already mounted on a PCB and it kind of bothers me that it draws around 300-400 mA (random spikes from 260 to 300 but since its on normal operation and not on alarm condition (buzzer on, LED on, XBee transmitting and receiving), I made the end estimate at 400 for allowance).
According to my noob knowledge and estimates (I’m still not into electronics that much), it should draw just around 100-200 mA with the major components just by reading their specs. Now I’m just stuck with that and I only have a few options with the battery as well, considering both the battery dimensions and capacity as well. This one is kind of okay since it has a small size for its capacity (usually ones at this size are around 800-900+ mAh) and is cheap. I need at least 55 mm x 45 mm x 6 mm for the dimensions considering the fixed enclosure size.
Lastly, I need the wireless fire alarm node (the whole circuit) to last at least 2 hours with 1 hour charging from the TP4056 module. Considering all of this, should the battery suffice or do you have any other suggestions? I just can’t find any good ones readily available here (btw I’m from the Phillipines).