waterproof battery pack for 2-3 Li-Ion Rechargeable 2032 Button Cells

I need help making a waterproof battery pack for 2-3 lithium ion rechargeable button cells.  I want to run a strand of 10 led chrsitmas lights on button cells rather than 2 AA batteries.  please help.
jtr10@netzero.net

Thank you for your time
Jeremy