Toshiba Laptop Battery Shop

How to repair a laptop battery

The typical SMBus battery has five or more battery connections consisting of positive and negative battery terminals, thermistor, clock and data. The connections are often unmarked; however, the positive and negative are commonly located at the outer edges of the connector and the inner contacts accommodate the clock and data. (The one-wire system combines clock and data.) For safety reasons, a separate thermistor wire is brought to the outside.

Figure 1: Terminal connection of a typical laptop battery
The positive and negative terminals are usually placed on the outside; no norm exists on the arrangement of the other contacts.
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Simple Guidelines when Repairing Battery Packs
1.Only connect cells that are matched and have the identical state-of-charge. Do not connect cells of different chemistry, age or capacity.

2.Never charge or discharge Li-ion batteries without a working protection circuit unattended. Each cell must be monitored individually.

3.Include a temperature sensor that disrupts the current on high heat.

4.Pay special attention when using an unknown brand of cells. Some may not contain a high level of intrinsic safety features.

5.Li-ion is sensitive to reverse polarization. Observe correct polarity.

6.Do not charge a Li-ion battery that exhibits physical damage or has dwelled at a voltage of less than 1.5V/cell.

7.When repairing Li-ion, assure that each cell is connected to a protection circuit.