FWIW, there is another option to these Splitters, and that is to get a multi-output multi-stage Smart Charger.
I installed a Victron Blue Smart 20A Charger with 3 Outputs. One output goes to the Leisure Battery Bank, another goes to the Starter Battery, and the current of each output varies depending on what the connected battery requires (upto a total of 20A across the 3 outputs). I have confirmed this behaviour using a clamp meter.
The 3rd output I use for charge a loose Wet Cell or AGM batteries to save bringing out another charger for it.
Not a cheap solution, but it is a good one, especially with the ability to monitor via Bluetooth.
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For longer term use, two smart chargers are a far better idea than switches or splitters. Smart chargers monitor the state of the battery, so switching makes them start again, splitting confuses them.
When first connected, a smart charger cannot tell the state of charge, only the voltage. They have to run through the phases to get to the maintenance phase.
Far better to have a separate smart charger for each battery (or a single, multichannel one if you like your eggs in one basket).
The engine battery charger can be a low output one, not costing much.
As for chargers going through the stages mine takes about 30sec to sort itself out before settling down,but yes two are better esp for long storage over winter,
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