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older version of CTEK MXS 5.0 lead acid charger modification help

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smilem

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Hello, I have a first generation of CTEK MXS 5.0 lead acid charger. My charger does not have RECOND mode for small bateries.

Differences (see attached voltage/curent tables from manuals):

Questions:
1. Is there any way to limit the current to 0.3A on my charger that gives 1.5A in RECOND mode?
2. Is there any way to force the charger to start desulphation (mode 1) manually (by adding a resistor to battery) does not work :(
 

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