HP41, N battery (N Cell), charging of HR1

[Dave Frederickson]

(10-12-2020 06:55 PM)Erik-M Wrote:  The X-cell batteries are also available at conrad in the Netherlands for € 2,12
Lowest price I could find, conrad is usually more expensive.
https://www.conrad.nl/p/oplaadbare-n-bat...uks-255174
I use a SkyRC MC3000 charger because besides all the normal bells and whistles it has a programmable charge current down to 50 mA, a shutdown timer and mAh counter.
And you can connect to a computer to plot a nice charge / discharge graph.
I blew up too many batteries in my life.

50 mA is precisely the charging current necessary to apply the IEC "forming charge" to those 500 mAH batteries. It's even printed on the side of the batteries.
http://www.robotreviews.com/chat/viewtop...=4&t=12301

I must say the SkyRC MC3000 is the fanciest charger I've ever seen (Bluetooth, really?) and also the most expensive.

Dave