First, the lack of agreement with dell u4873 li-ion rechargeable battery, repair of batteries based on past experience, the fact that the battery can not be completely damaged, can be activated through a variety of methods, including performance of state for the short-circuit the battery. The battery voltage to 0 with one end connected to the circuit board offline to avoid damage to circuit boards in operation. open circuit voltage of the battery after the re-survey, remains 0V, ruled out the possibility that short-circuit boards.
By shorting the battery failure, the method is more effective method of high voltage current time, using the old IBM power supply (my backup power), max 16V 3A output string on the meter ( a tributary of the current file 20A), the first negative power delivery even with the battery anode and a cathode power meter then feather table red table with a touch of black feathers cathode Meter Battery, speed, faster as far as possible, the first two degrees to see the meter has reached nearly to the 2A (moment) and the third in only 0.4 A for an immediate end to measure the voltage the battery has been restored to about 3 V, the internal battery short circuit that has been boiling instant high current (If you do not damage the battery to stop immediately, even if so, the battery life and have capacity ifdo the impact, if conditional, or recommend replacement, but if the replacement, then try to replace the entire battery.) However, the batteries should be a separate charge (if the battery charge of the whole group, this will result in the other two groups had mesenchymal cells), connect the charger to start charging ammeter to monitor during the current load of 500 mA or so, 3.6AH battery current is small, but the charger is the charging current is limited and a small current to the dell xps m1330 battery is good for the resumption. After about six hours, the charger showed the battery is full, continue to the new position for about two hours, remove the battery, the voltage of 4. 2V far been achieved, with bright halogen bulb in the lantern (3V, 500 mA) to meet her, the focus of strong discharge current of 700 mA, the battery pack has been basically restored, continue to play until the battery voltage to 3.8 V, with the purpose of the two groups with the same battery voltage, charging time together in order not to overload the back to solder the battery pack any battery circuit.
Since the battery voltage Dell Inspiron 6400, while the circuit board there is no exit, then surely have damaged circuit boards, after observation, negative input circuit board (making battery) output ( at the time output contact) is directly connected, and the positive input and output control of high power thyristors, the thyristor remains in state court, ie, the control circuit is not output signals to control SCR control terminal, or simply, the SCR has been destroyed. (Measured after the control signals that I did not) because they have the ability to repair single-chip microcomputers. DELL to take into account the protection of the most perfect BB, is about to run out of battery power will turn off automatically when the battery is intended to be used for entertainment, therefore, need not worry too much about, so I decided to shake the battery circuit protection CV, depend directly on BB protection circuit. SCR is the input pin and output (ie, the cathode circuit board input and output pin) between the solder in a fuse of 2 small, 2A fuses select the reason is based on actual usage, the most large power consumption of computers, the current does not exceed 1.9 A, 2A capacity sufficient unusual circumstances (eg accident short circuit), but also to ensure that the fuse of the time, but also play a role in protection.
