Quality Control of Lead-Acid Battery according to Its Condition Test for UPS Supplier and Manufacturers

Table 4

Service time and internal resistance of regression analysis.

Variable	Coefficient estimates	Standard deviation	-value	value	Significant	-square
Constant	3.2847	0.2354	13.96	<0.0001	1%	0.6538
Time	0.0358	0.0033	10.87	<0.0001	1%