On the models I have seen you can replace the battery from the outside Edit: it seems electronic locks that come on top of the existing lock tend to have the b

On the models I have seen you can replace the battery from the outside Edit: it seems electronic locks that come on top of the existing lock tend to have the battery pack inside, while electronic only locks can have it outside. BTW the batteries are supposed to last two years in the product description (that's in line with what I had too) I was mentionning these kind of locks: http://www.kk-alpha.com/housing/ns100/images/product_01.jpg http://www.kk-alpha.com/housing/ns100/images/product_01.jpg