Synergy Digital GPS Battery, Works with Garmin Drive Assist 50 GPS, (Li-Ion, 3.7V, 930 mAh) Ultra High Capacity, Compatible with Garmin 361-00035-01 Battery - Walmart.com
Best Buy: Garmin Refurbished nüvi 50LM 5" GPS with Lifetime Map Updates NUVI50LMREFURB