There isn't any LED indicator on the Mojo Power Card Wallet, how do I know if there are remaining charge in the battery module?
Due to the slim profile of our charger, we are unable to incorporate any LED indicator. However, you may simply plug in a Micro-USB cable from a USB port or AC outlet and observe the color of the lit LED found next to the Micro-USB port. Red will indicate the battery is low while green indicates it's fully charged.

There isn't any on/off switch found on the Mojo Power Card Wallet, how can I switch on or off the device.
There is no need to. You simply just plug in or out the Micro-USB cable to charge or stop the charge.

Since there is no on/off switch, will the battery module depletes it's charge over time if it's left in the charger?
The battery module will lose its charge over time no matter where it is stored. Since there is no on/off switch and if the battery is left in the charger, the depletion time will accelerate compared to not stored away from the charger.

Are there any ways to decrease the battery depletion time?
Yes. If you do not plan to use the fully charged battery module immediately, please remove it from the charger and store the battery module in a cool, dry place.

It is always recommended to charge all your battery modules before you use it. This is the characteristics of the battery technology currently adopted by the industry regardless of battery types.