The voltcraft p 600 offers intelligent charging for aa aaa c d and 9v batteries controlled by a built in microprocessor up to 4 batteries can be charged discharged at once either 4x aa aaa c or d simultaneously or 2x 9v and 2x aa aaa c or d simultaneously operating the voltcraft p 600 is simple and the charging process is fully automatic and each battery is charged and monitored individually once a battery is fully charged the p 600 reverts to trickle charge mode which maintain