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I've got two Hitachi BCL1415 batteries, same age. One still works just fine, one stopped working.
They are 14.4V, 1.5Ah batteries that I bought some years ago together with an Hitachi electric drill.
Once opened internal 4 x Sanyo UR18650W2 cells can be accessed. They are 3.70V, 1500mAh cells.
Charging the battery seems to work fine but, when the charger light gets steady (full charge), in contrast to the "good" one, which returns 15V, the one not working returns only 7V. As a result the electric drill won't work at all.
Once opened the plastic cover I can see a board with two K4066 components. No idea what they are for (I'm a biologist... ). A klixon ys11a80a is also visible, which should be a temperature switch designed to protect from overheating by opening the circuit above 80°C.
Voltage internally measured between positive of 1st cell (red wire) and negative of 4th and last cell (brown wire) is 4.13V. This is not what I would expect but, again, I'm not skilled in electronic.
I don't think cells' wear is the problem, as the other battery (same age, same use) still works just fine. Klixon too should be intact, or the circuit would stay opened indefinitely (I guess...). Could it be a problem regarding the electrical board ? K4066 components? What else?
Thanks in advance for any help to fix it.
They are 14.4V, 1.5Ah batteries that I bought some years ago together with an Hitachi electric drill.
Once opened internal 4 x Sanyo UR18650W2 cells can be accessed. They are 3.70V, 1500mAh cells.
Charging the battery seems to work fine but, when the charger light gets steady (full charge), in contrast to the "good" one, which returns 15V, the one not working returns only 7V. As a result the electric drill won't work at all.
Once opened the plastic cover I can see a board with two K4066 components. No idea what they are for (I'm a biologist... ). A klixon ys11a80a is also visible, which should be a temperature switch designed to protect from overheating by opening the circuit above 80°C.
Voltage internally measured between positive of 1st cell (red wire) and negative of 4th and last cell (brown wire) is 4.13V. This is not what I would expect but, again, I'm not skilled in electronic.
I don't think cells' wear is the problem, as the other battery (same age, same use) still works just fine. Klixon too should be intact, or the circuit would stay opened indefinitely (I guess...). Could it be a problem regarding the electrical board ? K4066 components? What else?
Thanks in advance for any help to fix it.
