Limiting the voltage of the original charger

[gertk]

Today I tried to reverse enigineer the original C5 charger. The new battery I got must not be charged with a voltage over 14.4 Volts but the original charger goes up to 15.7 before throttling down and that might destroy the battery.
The controller is a potted circuit board with mostly unrecognizable parts. There is a single 100k resistor connected to two pins but changing the value of it does not change the maximum voltage.
Has anyone tried to modify the charger ? Are there any circuit diagrams for the charger ?

If not I could try to make a new 'controller' which re-uses the power parts (the SCR's and such) and will generate the right charging curve for the new battery.

[C5 ENTHUSIAST + RESTORER]

Hi there .There are no circuit diagrams for the charger . And I have never tried to modify the it ....

[gertk]

I decided to keep the original charger in its original form and have bought a HQ 7-stage intelligent charger which will be mounted in the boot with an extension cable ready to be plugged in anywhere...