How To Correctly Charge A New Replacement Laptop Battery

With a little bit of technological knowledge, both new laptop batteries and replacement laptop batteries can be manually charged with a current limiting and user-adjustable voltage power supply.

Keep in mind you must “manually” charge the batteries. Why manual? The reason is that the charging of these new and replacement laptop batteries should never be left unattended, as there is no automatic termination of the charge. Thus, you will need to watch the current and voltage behaviors to determine when to shut it off.

When the replacement laptop battery or new laptop battery is completely charged, you will need to either disconnect the charge or reduce the voltage. Due to the difficulties that come with detecting power charges in nickel-based batteries, it’s best to stick with manually charging Li-on and lead acid new and replacement batteries.

What To Do Before You Charge Your New Replacement Laptop Battery

Even before you connect the battery, you need to determine the charge voltage based on the amount of cells in the series. Once you do that, set your preferred current limit and voltage. If you’re going to be charging a 12-volt lead acid battery to a 2.40 voltage limit, you’ll need to set that voltage to 14.40. Keep in mind this is six cells at a 2.40 voltage limit.

You want to choose the charge based on the size of the battery. For lead acid new and replacement batteries, this will be between 10 and 30 percent of its rated capacity. Thus, if you have a 10Ah battery at 30 percent, it charges at approximately 3A. Starter batteries should be charged at lower currents. An 80Ah pack charging at 10 percent has a rating of 8A…although higher currents can be a possibility.

What To Do During The Charge

Regardless of what kind of battery you have – new laptop battery or replacement laptop battery – you need to watch it while it’s charging. Be sure to look at its current, voltage and battery temperature. Be sure you’re in a well-ventilated room with ambient temperatures during the charge. Once completely charged and the current drops to three percent of the Ah rating, it’s done.

Disconnect from the charge. When there is a high self-discharge, it keeps the current from going to the expected low current level when completely charged. You need to also disconnect the charge when the current bottoms out and is unable to go any lower. If you must have a float charge for working readiness, reduce the charge voltage to roughly 2.25V/cell.

The power supply may be used to equalize the lead acid new laptop battery or the replacement laptop battery by having it set to a 10 percent higher charge voltage than actually recommended. This overcharge time is important and must be watched intently.

A power supply also has the ability to reverse sulfation but the chances of success are not guaranteed. When applied to a charge, the completed sulfated lead acid is unlikely to draw lots of current initially. However, as the sulfation layer diminishes, the current will steadily increase. If you need to boost the charge voltage to more than the recommended level, have the current limiting to the lowest possible practical value and watch the voltage. If there’s no charge after 24 hours, it’s unlikely the restoration will be successful.

The lithium-ion replacement laptop battery or the new laptop battery charges in much the same way as the lead acid. There’s no issue to use the power supply but you must have additional caution. Have the voltage set at 4.20V/cell, making sure that no cells in the series goes above this voltage.

When the cells have a 4.20V/cell voltage, the current decreases to three percent within the rated current or it bottoms out and cannot decrease any further, they have a full charge. You can now disconnect the new laptop battery or the replacement laptop battery. Under no circumstances should you let a cell stay at 4.30V for more than several hours.

How To Calculate A Full Charge On A Nickel-Based Battery

It’s best to steer clear of nickel-based batteries with power supply, regardless if they are new or a replacement. After all, detecting a full charge is quite difficult to do, as the voltage signature will vary based upon the applied charge current.

If you do need to charge your new laptop battery or replacement laptop battery, be sure to use the temperature increase on the rapid charge to learn if it’s got a full charge. When the battery is charging at low current, guess what the remaining charge level is and come up with the charge time.

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