Battery-capacity-tester

2016-01-19 10:32  
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The test circuit gives an indication of the capacity remaining in a battery. By noting the time in seconds that the LED remains on after you depress the test switch Sl. The circuit has proven reliable in testing NiCad-, carbon-, and alkaline-type batteries. Closing Sl activates the circuit by applying voltage from the battery under test.
Battery-capacity-tester

Voltage V, jumps to a value V0 ~ VRR3 /(R2 R3 ) when the switch closes and then increases with a time constant T ~ C1 (R2 R3). The divider R4/R5 fixes V2. The reference circuit IC1 sets VR to approximately 2.5 V. The op amp`s output remains high (LED on) until V, rises to the level of V,, when the LED turns off.



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