Battery for TPS1000 and TPS2000 Series Instruments, 12V/1.8Ah. At first glance, chargers and batteries do not seem like especially important accessories, nor ones where it is essential that the user pay attention to quality or origin. Experience shows the opposite. Instruments and their electronics react sensitively and need a reliable power supply in all environmental conditions. Under these conditions, some batteries and chargers may function, some only for so long and some not at all. That is why the quality and efficiency of originals always counts.