This compact user-friendly tester indicates the energy content of most common rechargeable batteries and batteries within a very short time. The actual energy content of the cell in the increments of 10% is displayed within 2-3 seconds from connecting the battery to be checked. The cell voltage in Volt (V) is additionally displayed for indicating the percentage capacity.The following cells can be checked reliably in the test device within seconds:LITHIUM BUTTON CELLS CR1025 / CR1216 / CR1220 / CR1616 / CR1620 / CR1632 / CR2016 / CR2025 / CR2032 / CR2320 / CR2330 / CR2354 / CR2430 / CR2450 / CR2477 / CR30323V Lithium photo batteries CR2 / CR123(A)1.5V ALKALINE BUTTON CELLS LR41 / LR43 / LR44 / LR44 / LR45 / LR48 / LR50 / LR52 / LR53 / LR54 / LR55 / LR57 / LR58 / LR59 / LR60 / LR63 / LR66 / LR691,44V Zinc-air button cells: 10 / 13 / 675 / 31212V Alkaline-Batteries A23 / A271.5V alkaline batteries AAA (micro) / AA (mignon) / C (baby) / D (mono)9V Block battery (E)1.2V NiMH/NiCd batteries: