The part in detail:

Part B67542027 , Battery charger with trickle charge function, 25A

Type:Battery charger with trickle charge function, 25A

The powerful changer is specially tailored to Mercedes-Benz requirements. State-of-the-art: revives, recharges, checks and maintains the charge. Charges with correct voltage and correct charging current. Fully automatic, 8-stage charging. Temperature equalisation for optimum charging voltage. Pulsed trickle charge function. "MODE" button allows selection of different charging modes: "Supply" mode (trickle charge function or as voltage supply unit); "Recond" mode (charges or reactivates very depleted batteries). For longest possible battery life. Capable of charging totally flat batteries. No damage to electronics connected to battery. Protected against sparks, short-circuit and reverse polarity. Also hose-proof and dustproof (IP65). Cooled by power-controlled fan. Insulated clamps spaced 50 cm apart. For 12V lead/acid batteries up to max. 500 Ah. Simple to use. Ideal for seasonal or showroom vehicles. Supplied with bag for easy transport and safe stowage. >>

W 164 ((USA 04/05) 07/05-07/08)
Kit consists of following parts: battery charger with trickle charge function and insulated clamps, black bag and instructions

Price: £343.20