now is it possible mossad swapped the batteries for 'ones that were intentionally boobytrapped to explode'? maybe
but sending a page to a pager doesnt magically do anything special unless you backdoor the pager somehow too.
how does a pager 'work for months and months, but then ... explode'? You have to tell it to handle a specific page a different way.
so we're talking about backdoored whole pagers