Which mode should I select for trickle charge or maintainer?

Answer:

There is no separate mode for this function. Sigma battery chargers are fully-automatic and go into maintenance/ trickle charge mode automatically after fully charging the battery.

The HULKMAN proprietary 9-Step Charge Optimizer algorithms consist of Qualification, Soft Start, Pulse, Recondition, Bulk, Absorption, Full, Analysis and Maintenance. Therefore, it does not need to be manually selected.