All you need to do is change the screen name @PhOnXe (this is my phones twitter accout) and your onxToken which you can get at  tweetonX. You also want to change your tweet that is posted. With this script I am not forsure on the exact percent that battery is low but my guess is 10-15%. I have verified that this does work. Check is out @PhOnXe.

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To use this on{X} Recipe, simply copy the code below and modify if needed.

 // Triggers the function when the screen unlocks
        device.battery.on('low', function (signal){

 
 // Initializing variables
        var twitter = { screenName : "PhOnXe",onxToken : "XXXXXX" } ;
        var tweet = encodeURI('My battery is below 10%, I will die soon. -PhOnXe');
    

        // Sends tweet using TweetOn{X}
        device.ajax(
            {
                url: 'http://tweetonx.com/api/tweet/'+twitter.screenName+'/'+twitter.onxToken+'/?t='+tweet,
                type: 'GET',
                headers: { 'Content-Type': 'application/xml' }
            },
             function onSuccess(body, textStatus, response){
                var parsedBody;
                if(!body){
                    var error = {};
                    error.message = 'invalid body format';
                    error.content = body;
                    console.error('error: ',error);
                }
                console.info('Status: ' + body);
            },
            function onError(textStatus, response){
                var error = {};
                error.message = textStatus;
                error.statusCode = response.status;
                console.error('error: ',error);
            }
        );
        
        });