Upon unboxing the Bosch Model  C3 6.3/12.6 VDC Battery Charger, it is immediately evident that  this is a high quality product characteristic of the Bosch name.  The C3 is very compact compared to the old car battery chargers of the past.  The charger is constructed of a high impact plastic and therefore not susceptible to rusting as were the old metal box chargers.  All mode and status displays are on the front of the charger, as well as the single mode select button.  The C3 is equipped with a heavy duty 120 VAC power cord as well as a durable DC charging cable.  The DC charging cable is equipped with in inline disconnect, allowing the supplied insulated alligator clips to be left connected to the battery between charges.  The DC charging cable is also equipped with an inline 10A automotive type fuse to provide short circuit protection to the C3 charger.The Bosch C3 battery charger is microprocessor controlled and hence should be considered a "smart charger".  The C3 is designed to the sense the charge state of the battery, as well as determine the appropriate charge rate.  The C3 can provide a pulsed charging current of up to 3.5 A  for deeply discharged batteries, as well as provide a low current trickle or maintenance charge.  The C3 continuously monitors the battery charge state and automatically reverts from pulse to trickle charging when the battery is fully charged.The Bosch C3 battery charger was tested on a moderately discharged Delco S2000 115 AH deep cycle battery.  As expected, the C3 immediately switched to pulse charging, remaining in the pulse mode for approximately 7 hours before reverting to a trickle charge mode.The Bosch C3 battery charger performed flawlessly.The 36 page Bosch C3 instruction manual  is very well written and printed in 3 languages, English, French and Spanish.  Bosch strongly emphasizes operating safety.  The manual clearly addresses the potential for charging wet cell batteries to "off gas", thereby creating an explosive atmosphere.  Therefore, the charger should never be connected or disconnected from the battery while the battery is charging. Bosch also cautions the user from operating the charger in wet conditions.Bosch emphasizes that this charger is only designed to charge 6.3 or 12.6 VDC wet cell or gel cell rechargeable batteries.  It is not designed to charge dry cell batteries.The Bosch C3 Automatic Battery Charger is packaged with the C3 automatic charger, a battery charging cable equipped with a disconnect and an inline 10 A automotive fuse, red and black insulated heavy duty alligator clamps, a removable hanger and an operating manual.  Bosch provides a generous 2 year limited warranty on parts and workmanship.The Bosch C3 Automatic Battery Charger is a high quality product that should provide many years of reliable service when used in accordance with the supplied operating instructions.  Although the C3 isn't designed for high current vehicle starting applications, it proves to be very versatile for many battery charging applications.The only shortcoming found with the Bosch C3 charger is that the AC line fuse is internal and not field replaceable.  Bosch might consider making the AC line fuse user replaceable in later production runs of this product.