Gomadic Intelligent Compact Car / Auto DC Charger suitable for the Garmin Nuvi 40 40LM - 2A / 10W power at half the size. Uses Gomadic TipExchange Tec - Walmart.com
Garmin Nuvi 40 GPS Navigator | eBay
Portable Emergency AA Battery Charger Extender suitable for the Garmin Nuvi 40 40LM - with Gomadic Brand TipExchange Technology - Walmart.com