[50G] Question

[zx81]

(04-08-2015 08:59 PM)Tugdual Wrote:  All right so based on what seems to be a common practice, I purchased 4 x 850mA/h NiMH batteries and fully loaded they are about 1.39V each which is way above my expectations. I thought chemistry was imposing 1.2V as a maximum...

NiMH will often measure close to 1.5v when immediately taken off charge and measured without load. Leave them for a day and they'll probably be closer to 1.35v depending on quality or if they're a slow self-discharge type like Eneloop.

However once under load in your calculator they'll tend to provide most of their useful energy at around 1.2v. The actual discharge voltage curve will depend on load and can often be downloaded from the site of whoever made the battery.