PP (Power Pack) battery family from left to right: PP1, PP3, PP4, PP6, PP7, PP8, PP9, PP10, PP11 ĩ-volt batteries accounted for 4% of alkaline primary battery sales in the United States in 2007, and 2% of primary battery sales and 2% of secondary (rechargeable) battery sales in Switzerland in 2008. Primary lithium types are made with three cells in series. Carbon-zinc types are made with six flat cells in a stack, enclosed in a moisture-resistant wrapper to prevent drying. These cells are slightly smaller than LR8D425 AAAA cells and can be used in their place for some devices, even though they are 3.5 mm shorter. Most PP3-size alkaline batteries are constructed of six individual cylindrical 1.5 V LR61 cells enclosed in a wrapper. A few other 9-volt battery sizes are available: A10 and A29. A range of PP batteries was produced in the past, with voltages of 4.5, 6, and 9 volts and different capacities the larger 9-volt PP6, PP7, and PP9 are still available. The size, regardless of chemistry, is commonly designated PP3-a designation originally reserved solely for carbon-zinc, or in some countries, E or E-block. Designations for this format include NEDA 1604 and IEC 6F22 (for zinc-carbon) or MN1604 6LR61 (for alkaline).

Mercury batteries of this format, once common, have been banned in many countries due to their toxicity.

The nine-volt PP3-size battery is commonly available in primary zinc-carbon and alkaline chemistry, in primary lithium iron disulfide and lithium manganese dioxide (sometimes designated CRV9 ), and in rechargeable form in nickel-cadmium (Ni–Cd), nickel-metal hydride (Ni–MH) and lithium-ion. This type is commonly used for many applications including household uses such as smoke and gas detectors, clocks, and toys.

The PP3 has a rectangular prism shape with rounded edges and two polarized snap connectors on the top. Batteries of various sizes and capacities are manufactured a very common size is known as PP3, introduced for early transistor radios. Actual voltage measures 7.2 to 9.6 volts, depending on battery chemistry. The nine-volt battery, or 9-volt battery, is an electric battery that supplies a nominal voltage of 9 volts. You could also try making your own solar panel, its really easy and cheap to build.Size comparison of batteries: D, C, AA, AAA, AAAA, PP3 (9-volt) Simply solder the positive and negative leads from the panel in place of the battery clip and you're ready to start solar charging.

You can easily turn this charger into a solar charger by replacing the 9V battery with a small solar panel such as this one. This makes the chargers output a bit more reliable and protects your connected devices. Simply connect the GND to your black 0V wire and the +5V to the output of your regulator.Īdd a 100uF capacitor across the input and a 10uF capacitor across the output of the voltage regulator to smooth out any voltage spikes or dips. You'll need to add the circuit in the attached image onto the centre two pins in order to 'fool' the iPhone into thinking that it is connected to a proper charger. If you'd like to improve on the USB charger and make it slightly more functional, here are a couple of modifications you can make to it.Īn iPhone won't charge on this charger with the centre two pins of the USB socket left open circuit.

9v battery clip