Refurbished is a little bit different from home-made.
Refurbished means just replacing dead cells with new cells.
And for the 1kWh battery, I still use the Bosch BMS. Doing this for 4 years now and haven't killed any of my refurbished batteries yet.
And the 1kWh battery totally messed with the Bosch capacity tester, it is funny how it shows 2 minutes left until finished and goes on for a few more hours
. It definitely does not show over 100% capacity.
And BTW, I do also charge them with up to 6A even though there is no 6A charger for 115V.
But I have my little home-made solar charging station for the Bosch batteries. Just for the heck of it because we have a lot of sun and I have some future plans for that.