Bought a battery charger from ALDI several years ago, couldn’t find the manual but downloaded one easily. Turns out it has 6 & 12 volt charge cycles, including an extra low charge rate for lead-acid batteries between 7.3 & 10.5 volts. This charge rate is up to 800 mA then when(if) the battery reaches more than 10.5 volts it goes into a trickle charge mode.
Other cycles are for motorbike batteries & for low-temperature charging conditions.