The following is a list of tests that BSB products go through to ensure quality.
Batteries are discharged at the 0.3C rate. After 150 minutes of continuous discharge the battery voltage under load must be 1.75 volt/cell to pass.
HIGH LOAD TEST
A load of 2 C amps is applied for 5 minutes while the terminal voltage is monitored. To pass, the voltage must be >11.88 volt/ per battery.
Batteries are inspected for proper appearance of battery case, terminals, seals, markings, and the absence of electrolyte leakage. Several samples each day are checked for compliance with specified dimensions and tolerances.
CAPACITY TEST - MEDIUM LOAD
Samples are fully charged, then discharged at ambient temperature at the 0.2C rate to a final voltage of 1.7 volt/cell. The discharge time must be no less then 4 hours.
CAPACITY TEST - HIGH LOAD
Fully charged batteries are discharged at 77°F and 25°C at the 2C rate to an end voltage of 1.35V/cell. The expected discharge time is >15 minutes.
SHELF LIFE TEST
Fully charged batteries are stored for 2 1/2 weeks at 131°F (55°C). A discharge test performed at ambient temperature applying a load of 0.2C rate to 1.7V/cell must yield a run time of at least 3 hours, i.e. the capacity loss resulting from self-discharge must not exceed 50%.
Sample batteries are subjected to vibration is any direction at the rate of 2000 cycles per minute and amplitude of 0.1 inch (2.5mm) for 2 hours. No signs of damage, leakage, or change in electrical characteristics are expected.
Fully charged batteries are overcharged at the rate of 0.1C amps for 48 hours and then is expected to produce a run time of 8.5 hours, or at least 95% of initial capacity, and an absence of problem signs.
RELIEF VALVE TEST (UL924)
A fully charged battery is submerged in a tank filled with mineral oil and charged at 0.4C amps. This overcharge is to demonstrate the proper functioning of the safety relief valve. The release of excess gasses through the vent is demonstrated by bubbles rising from the battery.
CYCLE LIFE TEST
At an ambient temperature of 77°F and 25°C sample batteries are discharged at the 0.2C rate to 1.7V/cell and recharged at the 0.25 rates up to 2.5V/cell until charge current drops 0.01C amps. At least 200 cycles must be obtained before the capacity drops below 60% of initial capacity.