User manual CAD AUDIO EQUITEK BATTERY REPLACEMENT INSTRUCTIONS

[. . . ] CAD Professional Microphones Battery replacement instructions for the Equitek Series What you should know about CAD microphone batteries: Most of the E series microphones use dual 9-volt rechargeable batteries. These batteries provide the reserve power that the mic needs to operate correctly. [. . . ] You can charge it faster if you leave the mic off while it's charging; allow approximately 12 to 24 hrs to fully charge the batteries. You may be able to use the mic while it is charging, it depends on how drained the batteries are. Nickel Cadmium batteries can develop a memory effect if the batteries are repeatedly charged but not completely drained before being re-charged. If this happens the batteries can be reconditioned by letting the batteries drain completely before you charge the batteries, this cycle may have to be repeated several times to restore the capacity to the batteries. Nickel Metal Hydride batteries do not suffer the memory effect as badly as Nickel Cadmium batteries; these are a better choice if you are replacing batteries. Rechargeable 9-volt batteries are not really 9 volts. The carbon zinc/alkaline battery chemistry produces 1. 5 volts per cell, six cells add up to 9 volts. The chemistry in the nickel cadmium and nickel metal hydride battery produces only 1. 2 volts per cell, consequently it take seven 1. 2 volt cells to produce 8. 4 volts, but this is close enough to the desired 9 volts that most equipment needs to operate. A fully charged battery may measure more than 10 volts without a load, this is known as a surface charge and is normal. When the battery has a load on it (the mic is turned on) this surface charge will dissipate and settle down to the true state of charge of the battery. Because of this surface charge condition it is always a good idea to measure the battery voltage with a load on it. If you have a meter, measure the DC voltage across each battery with the mic unplugged and turned on, a charged battery should measure 8 to 10 volts. [. . . ] Either setting of the configuration jumper will still allow the mic to charge when connected to a 24 or 48-volt phantom power supply. If the mic doesn't work, check to see what position the jumper is in, trying to use the mic with the Auto Shut-Off jumper set to "A" and phantom power off will keep the mic from turning on. [. . . ]