Popular field-type fast battery chargers. Clockwise from top left: AstroFlight 110 Deluxe, Watt-Age PF-12 Park Flyer AC/DC Peak Charger, tiny Dymond Modelsports four- to eight-cell mini-peak charger, FMA Direct Super Nova automatic peak-detect charger. All employ peak-detect-type circuitry—as it should be!