NiCd batteries are one of the most proven and historically most widely used rechargeable batteries. They are very dependable and robust. But they have relatively low capacity when compared to other rechargeable batteries. These batteries are not environmentally friendlier since they contain cadmium. You can improve the life of your NiCd rechargeable battery by removing any static charge that may have built up during shipping by turning on the phone and let the battery drain for about 12 hours. Then be sure to charge the phone for at least 8 hours. For long-term performance, completely drain the battery and recharge it once in every three months.
Ni-Cd batteries are rechargeable batteries, also known as secondary batteries that can be deeply discharged and have a high cycle life expectancy. Typically, Ni-Cd batteries are used when large capacities and high discharge rates are required.
Apart from the usually higher cost of 18650 batteries, compared to lead acid batteries, the biggest disadvantages of Ni-Cd batteries is their chemical components, nickel oxide hydroxide and metallic cadmium. Nickel Cadmium batteries were invented in the 19th century when environmental concerns simply did not exist. Cadmium is a highly toxic heavy metal and can cause substantial pollution when landfilled or incinerated. While recycling of Ni-Cd is possible it does not exist in Australia, all dumped Ni-Cd batteries are sent overseas for processing which ironically means that the carbon footprint is increased through recycling!
Other countries have long regulated the use and disposal of Ni-Cd batteries. In the USA, part of the battery price is a fee for its proper disposal at the end of its service lifetime. In the EU, they can only be used for a few predefined purposes.
Ni-Cd batteries require a charger with a higher voltage, compared to a lead acid battery charger. While these chargers exist, they are more costly again. A fully charged 12V battery bank can also go as high as 17V, which could cause inverters to shut down or worse, DC bulbs to blow.
In addition, the charging efficiency of lifepo4 batteries is generally rather low, which means of the electricity you put in only 70-75% can be retrieved. In comparison, lead acid batteries convert about 85% and sealed lead acid batteries are even better.