Nickel Metal Hydride Battery Charger Circuit

If you re like me and you like to spend a lot of time in the backcountry this means you don t have any way to charge you devices.

Nickel metal hydride battery charger circuit.

You could go look at a commercial solar battery charger but for popular brands these can easily cost 100 or more. It is a type of rechargeable battery. A nickel metal hydride battery also known as nimh is a secondary cell. So a 100 mah battery would be charged at 10 ma for 15 hours.

We know nickel metal hydride batteries are called as nimh battery this types of batteries are don t self discharge quickly and provides maximum voltage and current in minimal size hence used in most hand held electronics device. In this table c is the nominal capacity of the battery in ah. The cheapest way to charge a nickel metal hydride battery is to charge at c 10 or below 10 of the rated capacity per hour. Pin compatible ics type max712 and max 713 from maxim are intended for fast charging of nickel metal hydride nimh batteries.

The nimh cells like nicds require charging using a constant current. My questions is as follows. At some point in time i find the radios powered on in the charger. 60 hand held radios that have a nickel metal hydride battery.

It has to be charged by a usb only. The max713 may also be used in nickel cadmium nicd battery chargers see table 1. Unfortunately charging nimh nickel metal hydride batteries is not as easy to achieve compared to other types of cell or battery. The rate of charge is normally specified on the case of the cell and this rate should not be exceeded.

At the time of writing the latest aa nimh nickel metal hydride batteries have a capacity of up to 2900 mah. High quality ultra high capacity aa size rechargeable nickel metal hydride nimh battery new products. This method does not require an end of charge sensor and ensures a full charge. Using an original type conventional battery charger supplying 125 ma the charging time will be extremely long.

Because it is cheap and very common for aa cell in many capacity as required. They are used extensively in cameras and other electronic devices. I work for a department that runs approx. However the negative electrodes use a hydrogen absorbing alloy instead of cadmium a nimh battery can have two to three times the capacity of an.

As a school project we have to design the circuit of a charger of a nimh 3 6v battery. You could buy a solar powered battery charger but it s cheaper and more fun to make one yourself. This is nimh battery charger circuit with auto cutoff.