I'm about to start my conversion this week(end)...Update - I charged each battery up separately and reached full charge voltage. I then got a simple battery load tester and currently testing draining each battery separately to validate their charge capacity. So far the "weak" battery in the series string that had much lower voltage than the other three that were basically the same reported tested to have 105Ah capacity for the vs the listed 100Ah. The results showed 1311Wh vs the listed 1280Wh. So based on those results the 12v battery actually had more usuable capacity than listed. Currently testing the other three batteries.
The additional parts for testing are also showing up. I'm not looking to invest the money in a drop-in 48v pack so looking to do the least invasive yet most easily supported model to keeping these four 12v batteries balanced without having to open up the mower and pull the battery tray out to access the terminals. My leading idea is to:
1. Connect the four 12v batteries in series using the original wiring.
2. Install a 12v voltmeter directly to each battery with an included switch in case I wanted to turn off the always-on voltmeter display. This way I can open up the top access cover under the seat and see the state of each battery.
3. Install an Anderson SB50 adapter to each 12v battery so that I can open up the top access cover and top off each battery with a single 12v charger without needing to open up the mower.
Here is the picture install approach I'm looking to do. Any concerns or changes I should be making?
View attachment 141031
I've replaced my SLA's twice and agree it's a PITA getting the batteries loaded/unloaded. I'd like to have a similar setup as yours. Do you have a link to the volt meter display and the anderson connectors? What guage wiring and ring terminals are you going to use?