Je Johari N. de la Cruz, Ludwig Johann B. Tirazona (March 2003)
Philippine Science High School Western Visayas Campus – Department of Science and Technology (DOST-PSHS WVC), Brgy. Bito-on, Jaro, Iloilo City 5000, Philippines
ABSTRACT
This study determined the optimum charging rate for size AA nickel-cadmium batteries at 450 mA for 1.1 hours, 500 mA for 1 hour, and 550 mA for 0.9 hours, which are 90, 100 and 110 of their total capacity rating. It is also determined the significant difference in the effects of these charging rates upon the discharge time on NiCD batteries charge at these rates. Data gathered from the study were subjected to the mean and standard deviation as descriptive statistics tools., and the One Way Analysis of Variance, set at .05 alpha level of significance, as inferential statistics tool.
Charging the NiCd batteries at 450 mA for 1.1 hours yielded the shortest discharge period; charging them at 550 mA for 0.9 hours yielded the longest period. No significant difference was observed in the discharge periods among the batteries charge at 450 mA for 1.1 hours, 500 mA for 1 hour, and 550 mA for 0.9 hours.