U can add a LED or globe for an indicator. But i don’t really think u need it unless u add a timer with the charger.
And i’ve use custom Power Adaptor chargers since i got my first Dual Cell. I used outputs range from 300mA to 1A. And from 3V-6V. The chargers are definitaly good when u r at home and u want a quick charge on a multi cell car. And it saves u a lota money from buying batteries.
