Amazon.com : https://www.amazon.com/gp/product/B0088NUWA4?tag=eatingwelldia-20

Gomadic Portable AA Battery Pack designed for the Garmin Nuvi 50 50LM Powered by 4 X AA

Product Description :
Integrated circuitry regulates output voltage specific to the Garmin Nuvi 50 50LM Advanced logic maximizes overall charger efficiency
Built using the unique Gomadic TipExchange Technology that protects your investment by providing the ability to upgrade charging ports by simply swapping physical connectors
Specification Input Voltage 4 X AA Batteries Cable length 6 inches Dimensions 50 X 15 X 075 inches Circuit Design Garmin Nuvi 50 50LM specific TipExchange enabled Yes
Safely engineered with reverse polarity protection in the event batteries are accidentally put in incorrectly
This Gomadic Battery Pack is uniquely designed to work with both standard eg alkaline andor rechargeable AA batteries