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LED emergency light charged by own lead acid battery circuit

2016-05-10 02:28  
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LED emergency light charged by own lead acid battery circuit
When the lead-acid battery voltage is 4V, the measured work current of the lights is about 60mA, bright LED current is more than 600 mA.So the big current makes lighting time after each full charge not be too long and damages the internal structure of the battery so that shorten the life,so it is necessary to string into a current-limiting resistance of small resistance with highlight LED.After numerous experiments, when selecting 1.2Ω,working current eventually drop to 320 mA, while the brightness change is not obvious,Because the lamp hasn't changed much, the circuit of after transformation is omitted.