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Generator gard electric cu baterie de unica folosinta?

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Am un produs similar cu cel din link 


Acumulatorul are 9V la 120 Ah si circa, atentie, trei kg deci foarte usor. Dimensiuni 22x16x20cm. Al meu mai are vreo 6,5V acum. Cei din link au spus ca nu se poate incarca. Ca-i de unica folosinta. O fi cu litiu, cu alta tehnologie?

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Acum am alta problema. Am conectat aparatul cu baterie noua, se aprinde ledul verde dar nu am impulsuri. Am verficat si impamantarea si continuitatea gardului. Totul OK. Omul zice ca a legat aparatul cand avea bateria moarta cu un alt gard cu generator functional. Sa fi dat coltul ceva din el? L-am demontat si am gasit doua piese smd negre cu dunga argintie, gen diode, in scurt. Plus un tiristor pe care scrie 151SB (cred ca-i un BT151 de 800V). Nu stiu ce sunt diodele alea. Va trimit o poza cu zona afectata si una de ansamblu.




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