If you need to install new rechargable batteries there are a # of venues on the web to purchase batteries...I replaced a worn out battery pack in my meter (Sadelco) with some...soldered the tabs (+ to - and - to positive) to run in series and I spent $17.00 shipped over the $60+ Sadelco wanted + installation...Took about 90 minutes to complete and a couple days for the batteries...to get here...