Probably just a quible but the description says it gives trickle charge not float charge.
Trickle charge is old tech where the charger gives a constant low current (easy to do even 80 to 100 years ago). This needed calibrating to the installed battery manually otherwise the battery had a shortened life (letting it go flat gave an even shorter life).
Float charge gives a temperature controlled constant voltage which is better for the lead acid battery.
NiFe (old tech), NiCad, lithium all need thier own charging system.