Do I have to pay a deposit amount for the rented gear?

Yes. You will have to pay a deposit amount at the base camp. This amount is to be paid to our store manager.
The deposit amount has to be paid for each item you are renting. The price differs from product to product. Here is a list of the deposit amounts for each item.

The deposit amount has to be paid in cash. So make sure you carry the right amount. Getting change at such remote locations gets difficult.