About chargers - Float charging
All batteries suffer from self-discharge. Owners of caravans and boats are aware of this problem, as are those who rely on vehicles or applications that are used infrequently.
Trickle charging, or float charging, means charging a battery at the same rate as its self-discharging rate, thus maintaining a full capacity battery. The difference between a float charger and a trickle charger is that the float charger has circuitry to prevent overcharging. It senses when the battery voltage is at the appropriate float level and temporarily ceases charging; it maintains the charge current at zero or a very minimal level until it senses that the battery output voltage has fallen, and then resumes charging. It is important to note that the appropriate float voltage depends on the type of battery and the ambient temperature