Battery run competition, category 41

[Nate Martin]

(12-04-2016 09:08 PM)Hans-Peter Wrote:  

(12-04-2016 08:13 PM)Dieter Wrote:  But looking at the pictures, the Li-Po battery built into the case of a 82120A battery sounds very promising. Seems to be charged using an USB connection. Can you say more on this? I only wonder why the 450 mAh battery yields 47 hours, compared to the 300 mAh version with merely 27 hours.

You say that all the Li-Po runs ended with a "Memory Lost". Looking at the program, the low battery flag is tested once an hour. Maybe you should change this to once a minute. Running up to an hour on a low battery simply is too much here, and whether the program fishishes correctly or a Memory Lost occurs depends on the BAT annunciator appearing at minute 59 (program finishes, calculator turns off) or at minute 01 (59 more minutes to go until the next test).

Dieter

The retirement means the state of the calc (Memorylost or BAT). If you use a single cell Lipo, then you have a protection circuit witch drops the voltage imediatly, so the BAT flag has no chance to show low bat. The result is a ML.

The quality (real capaticity) of the lipos is sometime different. My actual 500mAh is now charging. In 3 days I will show more details.

Hans-Peter

I tried several different LiPO batteries and 5V circuits, always ran into two issues: 1 was the low voltage cutoff as mentioned above, not really a issue if we could get long battery life, but 2 was the way the circuits operated caused a much higher drain then expected and the ~500mah batteries only lasted about 3 days as the 5V circuit was always on. I found Nimh N-cells much easier overall for a recharagble solution.