hello yusuf, i don't know if the battery is interchangeable or not, but i suspect that you could. as far as the gps receiver is concerned it will be a wired one initially, as visuaide said they wont go bluetooth with the receiveruntil sometime next year. pete. ** Going on holiday and want to halt messages? Send a message to:- ** access-uk-request@xxxxxxxxxxxxx ** and in the Subject line type ** vacation ## d ** where ## is the number of days followed by d for days. ** For other things like digest mode, send a message, to ** access-uk-request@xxxxxxxxxxxxx with the Subject:- faq