Battery Bank

An extra bill of higher denomination set aside for emergency funds. usually stored under the battery of a cellular phone.

I was running low on cash and had to float on my battery bank until payday.

by Dr,Watson August 14, 2010

Double Battery Bank

Most commonly used in combination with the Battery Bank. However the Double Battery Bank includes an extra bill of higher denomination set aside for emergency funds that is stored between the phone and its cover.

Friend 1: "Damn, I only put $10 in my Battery Bank. I don't have enough cash to go with you guys."

Friend 2: "Don't forget about your Double Battery Bank! I just saw you put $20 behind your phone case yesterday!"

by ssimyllom August 31, 2010