LogTag TRIX-8 units are sealed at the factory so it is not easy to replace low batteries. That is now changed - you can get yours rebuilt with a brand new and RECHARGEABLE battery for just $45. Just send in your old one. This work is guaranteed for 6 years - 2 X the time of a new LogTag. On top of that, if you can send in 2 units and just want one back the charge is just $30. Send units to Kurt Shafer, 31130 S Genl Kearny Rd %2331, Temecula CA 92591. Place your order here for one and if you send two I will refund $15.