Got one for my birthday 🙂

Looks neat, but haven’t used it properly yet.
Does anyone know if the spare batteries can be sourced from far-east based ebay shops, rather than getting the genuine mem-map ones?

Don’t know, but mine lasts about 6 hours constantly on, depending on screen brightness.
You can extend that by sleeping it for the bits where you know where you are, but it doesn’t track while in sleep mode.