has this ever happened to you? you need batteries but you are always one short. well no more! this instructable shows you how to use one less battery and best of all.. its so easy and basic it hardly takes a minute. please note that this will decrease the life of the batteries as they are doing more work than usual. also this does not work if the batteries line up end on end.
Step 1: What You will need.
-battery (please note that this hack works best if you use more than half the batteries required for the device)
Step 2: Step 1
disassemble the pen to fund the small metal spring inside. stretch it so that it is a quarter inch or so longer than the battery.
Step 3: Step 2
put the spring in the battery case, winding it on tho the negative terminal (if the negative terminal is a spring. make sure it connects to both terminals.
Step 4: Step 3
put the remaining batteries in and you are good to go.