Rechargable battery

The standard power supply of the A/D interface and the active electrodes utilizes a high-capacity battery.  The battery power supply contains a lead-acid battery and a shutdown circuit to prevent the battery from deep discharge.  The combination of a high-capacity battery and very low power consumption of the A/D interface and active electrodes makes the ActiveTwo the only truly battery powered, high-resolution EEG / ERP system.  In the 256 channel version, battery life is at least 5 hours.  Fewer channels offer extended battery life -- up to 3 days for a 16 channel version.  Given the charge time of less than 4 hours, continuous measurements are possible with the 2 standard batteries provided with the system.  The battery can be changed in less than 10 seconds without interrupting system operation.

A sophisticated charger is supplied with the system to allow quick charging of the battery when used in cyclic applications. The special sealed lead-acid batteries that are used in the battery-box can be charged very quickly with the specially designed charging circuit -- full charging of an empty battery takes about 3½ hours. The charger automatically switches to a float state when the battery is fully charged, and the battery can be left on the charger for unlimited time without any reduction of the operation life. A battery life of approximately 1000 recharge cycles can be expected. The charger comes complete with an "all-world" mains adapter with replaceable AC adapter plug to adapt to the different AC voltages and outlets in Europe, USA, UK and Asia

Here are a few benefits of the unique battery power supply design:

• Large capacitance, compact battery.
• No memory effect; batteries can be recharged in any state of charge.
• More than 10 hours continuous operation time for 128 channel system (battery life scales with number of installed channels).
• Shelf life of charged batteries is at least 6 months.
• Battery power supply can be quickly replaced during operation.
• Long life, at least 1000 charge/discharge cycles.
• Automatic shutdown when battery is near empty to prolong battery life.

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