+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: General Forum (/forum-4.html)
+--- Thread: hp50g and power bank (/thread-8041.html)
RE: hp50g and power bank - pier4r - 08-12-2018 10:33 PM
Yes the eneloops are sitting on my desk since two months. Note that the calculator I use are mostly connected to usb. The batteries are there when I switch them as I have more calculators than usb ports, leaving one in standby without connection for some time. So even "poor" batteries may help in my case.
And I was mistaken, yesterday I got the parcel and it is a BC700. The BC1000 costs a bit more.
RE: hp50g and power bank - Vtile - 08-14-2018 05:22 PM
(04-30-2017 06:54 AM)pier4r Wrote: While reading the general forum I found another interesting post
http://www.hpmuseum.org/forum/thread-3988.html
It seems that sometimes the 50g just drains more power than needed.
There is another confirmation that when the usb is plugged, no battery drain. I love the 50g for this, because one can exploit the technology made for Smartphones to power it, just I did not know that power banks requires a minimum of drain power to stay active.
What were written at post #6. ... I told you. *hehehee*
RE: hp50g and power bank - pier4r - 09-09-2018 10:49 AM
Dieter!
The BC700 is awesome. If one has no experience of a product one may really miss something out. The charger offers so much data to reflect on.
Also likely has a PCB inside it that has hardcoded algorithms to test capacities and co. I would really like to know them. It is amazing what it offers. I used multimeters to determine voltage & co, but I couldn't dream to test a battery.
Does anyone know which algorithms or procedures the BC700 uses to determine the following?
- the capacity of a battery (with charges, discharges)
- estimate the current charge
RE: hp50g and power bank - Dieter - 09-09-2018 03:38 PM
(09-09-2018 10:49 AM)pier4r Wrote: The BC700 is awesome. If one has no experience of a product one may really miss something out. The charger offers so much data to reflect on.
Yes, there's quite some features to play with. ;-)
(09-09-2018 10:49 AM)pier4r Wrote: Does anyone know which algorithms or procedures the BC700 uses to determine the following?
- the capacity of a battery (with charges, discharges)
- estimate the current charge
I think the only one who really knows this is the manufacturer himself. But determining the charged or discharged capacity is trivial: it's just the integral of the current over the charge/discharge time. So if you take a current reading every, say, 10 seconds, just add these values in mA and multiply the sum by 10 / 3600 to get a mAh result.
Dieter
RE: hp50g and power bank - pier4r - 09-09-2018 06:54 PM
yes I am not expecting the precise formulas but an approximation.