Can anyone please tell me which switch position is needed on the MPPT250/100 for charging 12 V lead acid batteries?
Best regards
I was typing my answer and suddenly realised that the manual explains this better than I ever could. Good luck!
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Read the manual? What witchcraft is this! 
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Many thanks to you both for your input.
Just for clarity, I actually did read the manual and it was the rubric 5.1.2 that lead me to seeking assistance via the community forum.
Unless Iām overlooking something, none of the switch positions in the table list lead-acid as a suggested battery type.
I understand that I can make a custom battery type in 5.2.1 however given my ābeginnerā status, I thought it prudent to utilise a position preset.
Best regards
You asked for ālead acid batteriesāā¦
All batteries on the manual at 5.1.2 are lead acid batteries, less last position (7) which is for LiFePo4, obviously.
Depending on the type - gel, flooded, tubular or normal plates, etc., they have different (recommended) voltages.
If you look closely, for example at position 4, 5 and 6, they are for the same battery type, only with voltages that are slightly increasing.
The same with 1 and 2. That because for different situations, different voltagesā¦
Remember, on the UPS gel batteries itās written/recommended two sets of voltages: for cyclic or storage situations. For the same batteryā¦
Maybe an additional question like āwhich type of lead acid batteries?ā was in orderā¦
Or use the preset that itās close with the voltages recommended for your battery by its manufacturer, or, just like youāve already discovered, maybe itās better to define a preset of your own.
Many thanks for your help; the batteries in question are 12 V flooded lead-acid batteries.
Best regards
Normally 14,4V fits for most lead batteries.
If you want it better than you need to look at the datasheet of your battery.
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Thank you, that is the answer I have been searching for. 
Matthias