I looked at the Soneil chargers, but went with a Granite Digital Save-A-Battery. Packs have been in use on the ebike for 4 years now. Batteries in the packs were used to begin with, so they are something like 6-7 years old now. Still runs great and no current issues. I ride 11 miles each direction every day. and carry the charger to work to charge there. Two other owners on the forum I moderate have also purchased the SAB units and have seen a return to full capacity on their SLA packs.

What model Soneil did you buy? I was looking at the SRF ( If I remember correctly) series first because they had a full conditioning cycle like the SAB's.

I have checked my cells individually after charging with the SAB and found them all to be at same float charge and, after running them a short distance, still equal voltage levels. I have don this with several dozen recycled SLA cells at varying states of discharge.

The SAB is a bit cheaper than the Soneil as well, so I went with them. They are also very light and easy to carry on the bike. I have my packs in the garage on the bench for the winter now and continuously hooked up to the SAB for the duration.

-DS