Leith's Python test code for these measurements (requires pySerial and win32 extensions on Windows):

import serial
import time
 
print "begin WiTiltStressTest"
 
ser 	        = serial.Serial(15, 57600, timeout=5, parity="N", bytesize=8)
curTime 	= time.time()   
nowTime         = time.time()
 
print "++++++++++++++++++++++++++++++++++++++"
print "opened Bluetooth COMPort"
print "please reset WiTilt to change modes"
print "++++++++++++++++++++++++++++++++++++++"
 
for i in range(13):
	print ser.readline()
 
ser.write("1")
 
print "++++++++++++++++++++++++++++++++++++++"
print "turning on WiTilt Readings"
print "++++++++++++++++++++++++++++++++++++++"
 
line = ser.readline()
 
while len(line):
	#print line
	line = ser.readline()
	ser.flushInput()
	
 
nowTime = time.time()
ser.close()
 
print "++++++++++++++++++++++++++++++++++++++"
print "battery has lasted " + str(round(nowTime - curTime - 5, 3)) + " seconds"