Checking operational charging

To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer.

Perform operational charging. If the battery status indicator or icon does not turn on, remove the battery pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon still does not turn on, replace the battery pack.

If the charge indicator still does not turn on, replace the system board. Then reinstall the battery pack. If it is still not charged, go to the next section.

Checking the battery pack

Battery charging does not start until the Power Meter shows that less than 95% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life.

To check your battery, move your cursor to the Power Meter icon in the icon tray of the Windows® taskbar and wait for a moment (but do not click), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the Power Meter icon.

Note: If the battery pack becomes hot, it may not be able to charge. Remove it from the computer and leave it at room temperature for a while. After it cools down, reinstall and recharge it.

To check the battery pack, do the following:

1.Power off the computer.

2.Remove the battery pack and measure the voltage between battery terminals 1

(+) and 7 (-). See the following figure:

3 4 5

2(+)

1(+)

6(-)

7(-)

Terminal

Voltage (V dc)

1+ 0 to + 12.6

7Ground (-)

3.If the voltage is less than +11.0 V dc, the battery pack has been discharged.

Note: Recharging will take at least 3 hours, even if the indicator does not turn on.

If the voltage is still less than +11.0 V dc after recharging, replace the battery.

4.If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7. The resistance must be 4 to 30 K .

If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board.

30ThinkPad SL400, SL400c, SL500, and SL500c Hardware Maintenance Manual

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Lenovo SL500c, SL400c manual Checking operational charging, Checking the battery pack, Terminal Voltage V dc
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SL400c, SL500c specifications

The Lenovo SL500c and SL400c are part of Lenovo’s ThinkPad series, designed to cater to professionals and users who require reliable performance in a business-oriented laptop. These models are recognized for their blend of practicality, usability, and robust functionality, suitable for both business environments and everyday tasks.

Starting with the SL500c, this model features a 15.4-inch display, which provides ample screen real estate for multitasking and productivity. It is equipped with Intel's Core 2 Duo processors, ensuring efficient performance and responsiveness, making it ideal for robust applications and multitasking scenarios. The SL500c supports a range of RAM configurations, allowing users to choose up to 8GB to fit their specific needs. Additionally, it offers various storage options, including traditional hard drives and solid-state drives, to optimize speed and data retrieval efficiency.

The SL400c, on the other hand, sports a more compact 14.1-inch display, balancing portability with performance. Similar to its sibling, the SL400c is powered by Intel's Core 2 Duo processors, providing the necessary computing power for daily tasks and business applications. The laptop supports up to 4GB of RAM, catering to users who focus on efficiency rather than high-end gaming or graphic-intensive workloads.

Both models embrace Lenovo's reputation for durability, featuring a spill-resistant keyboard and robust chassis design to withstand the rigors of frequent travel. The ThinkPad keyboard is renowned for its tactile feedback, providing an enjoyable typing experience that enhances productivity. Additionally, these laptops incorporate ThinkVantage technologies, including security features like fingerprint readers, and hardware-based encryption to safeguard sensitive data effectively.

Another notable characteristic of the SL500c and SL400c is their extended battery life, providing users with the ability to work on the go without the constant need for charging. Integrated wireless capabilities, such as Wi-Fi and optional 3G/4G connectivity, ensure that users remain connected, whether in the office or on a business trip.

In summary, the Lenovo SL500c and SL400c exemplify a commitment to quality and performance. With their durable designs, effective processing power, and thoughtful business-oriented features, they remain valuable options for professionals seeking reliable computing solutions. These laptops truly represent Lenovo’s dedication to providing technology that meets the demanding requirements of the modern workplace.
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