Time was 9 hr 38 min from start until it shut off. What's interesting is that even while using boost converters, the bare GPS without using the boost converters went almost nearly as low in voltage before it shut off, so I have a feeling if I re-run this with teh battery mode set to lithium (so the screen never dims), batteries will probably run longer due to avoiding the losses in the boost converters. I'll probably test that tonight for fun.
[Some nice graphs not quoted here]
Link to the timelapse:
Nice data
Nice graphs
Data is so beautiful, so here are finally the voltages I have collected since the discussion has begun:
Whenever I get the chance to test a product's cut out voltage I do now, and I have only found one which a small chance that a Batteriser could improve the usability. But that's clearly due to a bad design decision.
So far:
Honeywell Rondostat Radiator Controller (2 AA) Firmware 2.04: 1.95-2.05V
Honeywell Rondostat Radiator Controller (2 AA) Firmware 1.xx (sorry forgot to note that down): 2.1-2.2V
Logitech Wireless mouse M705 (2 AA NiMH) 1.87V but starts to get weird around 2.0V
A cheapo crappy chinese "One-Hung-Lo" Mosquito heater pen (2 AAA) : 2.3V not really cut out, but heating up takes awfully long.
Clock, recently deceased battery (1 AA) : 0.78V, measured without load.
Remote for LG TV (2AA): This remote is badly designed IMO, the capacitor inside is too small and it takes high current spikes.
The µCurrent revealed it
Voltage under load (a spike) 1.6-1.7V while the batteries had 2.33V when idle.
Why I quote voltage ranges and not one voltage:
Sometimes I took several measurements under load, for instance when that radiator controller turned the motor on.
The voltage gets very noisy then and the values are jumping around a little.
I got the feeling that batteries that have been used for a long time (clock ore remote control) have a higher inner resistance than these who were used for one ow two months. However I didn't measure that, so that's just a guess.
All batteries were Alkaline, various brands but mostly VARTA.
Still to come:
A Surefeed RFID controlled cat feeder (prevents the other cat from stealing) : (4 C cells) : That thing is going for ages now, very impressed with that.
A PIR sensor controlled "get off the table, cat" compressed air spray can (4 AAA): Cat's are not naughty enough, so it's still going..
Dunno if it makes sense to also check the CR2032 from another remote