As a rule of thumb your battery charger should be 10% - 20% of the Ah rating of the battery. E.g A 100Ah battery would require a 10 Amp charger as a minimum. prevent overcharging, you should keep the charger size to within 30% of the total capacity. Single-cell batteries have a lower power output and a smaller size — typically, the maximum discharge current is between 1C and 3C (e.g. 1Ah = 1A to 3A). This means that single-cell chargers are often used for smaller mobile devices, such as phones, watches, and headphones. A battery charger is a device that provides Direct Current (DC) to the battery to restore the used-up electrolyte. So ideally, when all the electrolytes of the battery are restored, it's current supply should stop. A battery charger, recharger, or simply charger, is a device that stores energy in a battery by running an electric current through it. The charging protocol (how much voltage or current for how long, and what to do when charging is complete) depends on the size and type of the battery being charged. The 12V Battery Charger – Model 5607-00 is a solid-state battery charger designed to charge your 12-volt battery and maintain and hold it to a full charge. The 12V Battery Charger will keep your battery fully charged and can be plugged in for as long as you want. So at what percentage should you charge your phone? The best practice for preserving phone battery health is to plug it in at around 20% and charge it up to 80-90%. This is especially important if you use fast charging, as charging from 0% will cause a lot of heat, and from 80% up, fast charging becomes less efficient. Constant current (CC) charging initially allows the full current of the charger during the BULK stage to flow into the battery regardless of the battery state of charge or the temperature until the battery terminal voltage reaches a pre-set steady state. They're called alternating current (AC) and direct current (DC) power. The power that comes from the grid is always AC. However, batteries, like the one in your EV, c an only store power as DC. That's why most electronic devices have a converter built into the plug.