Hi,
For my Fluke 125, I have bought a VHBW "compatible" battery pack.
It is not very expensive : 22€ shipped, compared to the 120€ of the original part, but it is far from being compatible:
it powered the Fluke with its initial charge, but did not take charge.
The connector is not properly wired (yellow pin, Battery Ident, is not at the right position), and the battery pack itself is "optimized" for no charge: no thermistor and no identification resistor (820 ohm for NiMh battery)!.
At least, there is a thermal protection...
![](https://www.eevblog.com/forum/testgear/fluke-123-scopemeter-and-battery-replacement/?action=dlattach;attach=1131712;image)
I have swapped pins on the connector, put a thermistor from an old BP120 I had, added a 820 ohm identification resistor, and now the thing is OK.
![](https://www.eevblog.com/forum/testgear/fluke-123-scopemeter-and-battery-replacement/?action=dlattach;attach=1131716;image)
![](https://www.eevblog.com/forum/testgear/fluke-123-scopemeter-and-battery-replacement/?action=dlattach;attach=1131720;image)
After a first full charge, it powered the Fluke for about 4h.
The manual says 6h. I will see if it is getting better after a few charge cycles...
Michel.