[sdiy] DX7 battery replacement help

[Tom Wiltshire]

I used to work for an electronics company building dataloggers for  
the utilities. The loggers were powered by 3.6V lithium batteries,  
expected to last a decade or more. The thing that killed them more  
than anything was temperature. They'd often be fine when warm, or  
even reasonably cold, but after a spell of cold weather, a pile would  
turn up on the repair bench in a crashed state. A reset was often all  
they needed, since by then they'd warmed up, and they'd pass all the  
tests fine until you got them cold again. We used to replace the  
battery and then stick them in an environmental test chamber to check  
them over, and if they wouldn't wake up at -10C then they didn't go  
out the door.

But I learned to be aware that batteries are a chemical process and  
that chemical processes typically go faster in the warm. It makes a  
significant difference.

T.


On 6 Sep 2009, at 19:49, Andre Majorel wrote:

> Strangely, the battery voltage display did not always show the
> same voltage, sometimes 2.8 V, sometimes 2.9 V, sometimes 3.0 V.
> But it had been doing that ever since I bought it, about twenty
> years earlier...