Pur•Chek™ Pro Operation and Maintenance Instruction Manual8 P/N 2100-9001 Rev 24. Operation4.1. Battery InstallationThe Pur•Chek™ Pro has an optional internal rechargeable battery. If your Pur•Chek™ Pro is equippedwith the optional rechargeable battery, you must first install and charge the battery prior to use.NOTE: The Pur•Chek™ Pro can be operated with or without the battery using the supplied ACadapter.To install the optional battery, remove the battery cover from the back of the unit by unscrewing the twoPhillips head screws as shown in Figure 4-1.Figure 4-1. Location of Battery Compartment ScrewsInside the Pur•Chek™ Pro battery compartment, locate the male plug on the left side. Slide the nylonstrap around the battery. Insert the battery module into the compartment aligning the female connector ofthe battery module with the male plug in the battery compartment. Replace the cover and snug thescrews.NOTE: Charge the battery for a minimum of 4 hours with the supplied charger prior to firstuse. The battery cannot be charged with the standard power adapter.To remove the battery, simply tug gently on the nylon strap, being sure to pull straight up, until the batteryis dislodged. The battery may be charged either inside of the unit or independent of the unit.4.2. Turning On the UnitConnect the included AC power supply to the 12 VDC power input jack on the back of the unit (refer toFigure 3-6 on page 7). Plug in the AC power supply to a 110-240 VAC outlet.NOTE: If the optional battery module is installed and charged, the AC power supply is notrequired.