Stop/start batteries are AGM design . So presumably if the charger is suitable for these, then hopefully there shouldn’t be an issue . There are sub £20 chargers out there that say agm compatable, but are they ?

The instructions state suitable for wet or gel lead acid and AGM batteries but not for lithium batteries.

I bench tested one of these chargers with a brand new Yuasa AGM 12 ah AGM bike battery with two multimeters hooked up to check battery voltage and charge rate and it does what it says on the tin so to speak.

The charger I am referring to is the MD 19161 made by Medion, there have been quite a few earlier models from Aldi over the years.

Instructions here in english.

https://www.manualslib.com/manual/1675853/Medion-Autoxs-Md-19161.html?page=10#manual

Edited by focussed on 21/03/2020 at 16:36