From the start menu select CHARGE, then select LEAD ACID, then select CA / CA.

Once you have selected this mode your lead acid battery will run through the normal charge profile but will include the Recond mode (stage 6) at up to 15.8 volts which will help de-sulphate a battery with heavy sulphation in an attempt to rejuvenate the battery.

When a battery has been charged the charger holts the charging process when it reaches stage 5 to see if the voltage drops below 12 volts within 3 minutes. This test would indicate that while the charger was able to reach 14.4 absorption voltage that something else may be wrong with the battery. The owners manual shows the stage here

Possible causes for not maintaining a voltage above 12 volts include a dead cell or sulphation. At this point, if it fails to hold 12 volt the battery will restart the charging process. If however after 20 hours the charge isn't complete the unit will show the caution lamp indicating there is a problem with the battery which requires user intervention. Its normally at this point you'd either check water levels, test with a hydrometer, check with a conductance tester, perform a discharge test with a cranking unit or deep cycle test to ascertain if the battery is fit for purpose and replace if required.

If the voltage does not drop below 12 volts at the end of 3 minutes the charger will continue to finish its last modes and assume the battery is OK. If you need or want to test the battery further you can test the batteries internal health with our CTEK Battery Analyser

The PRO25S is the replacement for the MXS 25, the internals of the PRO25S are an all-new design that allows for running at peak power output without any derating for heat dissipation. It also includes a Lithium charge profile.

Otherwise it still has all the same features in the same sized housing as before but in the updated black colour.

Normal features included:

IP44 rated

2 year warranty

Alligator clips (no comfort plug connectors because of its high power output)

Normal Charge

Power Supply Mode

Recondition Charge Mode

25A output at 14.4 volts

DC output voltage temperature compensation

The PRO15S is the replacement for the MXS 15, the internals of the PRO15S are an all new design that allows for running at peak power output without any derating for heat dissipation. It also includes a Lithium charge profile.

Otherwise it still has all the same features in the same sized housing as before but in the updated black colour.

Normal features included:

IP44 rated

2 year warranty

Alligator clips (no comfort plug connectors because of its high power output)

Normal Charge

Power Supply Mode

Recondition Charge Mode

15A output at 14.4 volts

DC output voltage temperature compensation

These are terms used to describe the function of a charger. A workshop charger is designed and maybe even styled to best suit a workshop. A maintenance charger is best suited to maintaining the batteries state of charge. Typically (but shouldn't be) relating to small batteries, and therefore the chargers are low current output.

Larger batteries like a house bank on a boat or motorhome are large (over 200Ah) and require at least 20A to charge, but once the bulk charge is complete that same charger will be able to supply a lower current at a lower voltage to maintain the batteries state of charge. Therefore it is a charger and a maintainer.

This is not typically true the other way around. A low current output maintainer cannot charge up a flat battery. i.e. if the maintenance charger was 1A it would struggle to charge anything larger than a 20Ah battery (from below 10v) but it would be very capable to keep maintained a battery that size if only 20% discharged. (meaning it still have 80% of its own capacity inside the battery). The internal resistance of the battery is the limiting factor and differs from brand to brand, Ah, temperature, condition and age of battery so no rule can really be set as a guide.