Nickel Metal Hydride Battery Charger Circuit

60 hand held radios that have a nickel metal hydride battery.

Nickel metal hydride battery charger circuit.

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. At some point in time i find the radios powered on in the charger. 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. At the time of writing the latest aa nimh nickel metal hydride batteries have a capacity of up to 2900 mah.

The rate of charge is normally specified on the case of the cell and this rate should not be exceeded. My questions is as follows. A nickel metal hydride battery abbreviated nimh or ni mh is a type of rechargeable battery the chemical reaction at the positive electrode is similar to that of the nickel cadmium cell nicd with both using nickel oxide hydroxide niooh. Unfortunately charging nimh nickel metal hydride batteries is not as easy to achieve compared to other types of cell or battery.

So a 100 mah battery would be charged at 10 ma for 15 hours. Simple nimh battery charger circuit designed with few easily available components and it can provide constant voltage and current to the target 9 volt nimh battery. Because it is cheap and very common for aa cell in many capacity as required. 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.

High quality ultra high capacity aa size rechargeable nickel metal hydride nimh battery new products. You could go look at a commercial solar battery charger but for popular brands these can easily cost 100 or more. In this table c is the nominal capacity of the battery in ah. 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.

The max713 may also be used in nickel cadmium nicd battery chargers see table 1. Exact replacement for standard aa size battery in all the devices provides ultra long use time per charge with this ultra high 2600 mah capacity. As a school project we have to design the circuit of a charger of a nimh 3 6v battery. The nimh cells like nicds require charging using a constant current.

A nickel metal hydride battery also known as nimh is a secondary cell. It is a type of rechargeable battery. This method does not require an end of charge sensor and ensures a full charge. You could buy a solar powered battery charger but it s cheaper and more fun to make one yourself.

It has to be charged by a usb only. Pin compatible ics type max712 and max 713 from maxim are intended for fast charging of nickel metal hydride nimh batteries. Using an original type conventional battery charger supplying 125 ma the charging time will be extremely long.