Schumacher SC-8000A Speedcharge Charger/Maintainer

• 30-amp rapid charge and 12-amp fast charge features self adjustment and adjusts charge rate to prevent battery damage
• Compatible with virtually every type of automotive or light marine battery
• 80-amp engine start provides quick power to crank the engine
• 2-amp slow charge for small batteries and large battery maintenance
• 100-amp clamps for top and side-mounted battery posts

The meter accuracy on the SC-800A was within 0.05 volts, and the charging algorithms appear to work well, although they are not described in the instructions.

I observed that the voltage was generally limited to 15.5 for regular, 16.0 for deep cycle, and 14.7 for AGM batteries. The 30 amp capability is in the form of a long timed pulse of about 2 minutes followed by 12 amps for a similar time period, then repeating until the voltage has risen enough that it isn't required. The amperage isn't constant, it tapers down to limit the voltage in typical CC/CV fashion, although the algorithm appears to actually be more complex. For instance, on a particular AGM battery it went to 15.5 volts near the end of the charge (95%) with current at about 1.5 amps for about 30 minutes and then stopped (completed). I suspect that this was an automatic attempt to condition the battery. A DieHard 71227 charger (Schumacher makes the DieHard 71227 charger) did the same thing. After three discharge cycles, it stoped doing the "high-voltage treatment". Also, in AGM mode it went to 15.5 volts briefly during one of the 40 amp cycles. Although the instructions for DieHard Platinum and Odyssey batteries say to choose a charger with

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