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Lenovo ThinkPad T420 Power Adapter
The Lenovo ThinkPad T420 AC adapter provides two functions, charging the battery while simultaneously providing power for the laptop. Upon choosing a replacement adapter, the actual Lenovo brand is the best one to choose. If your decision is to purchase a different brand charger, please check on the output of amps and voltage. Because Lenovo has been known to use a single AC adapter that is most likely used on other laptop models, be certain you select the correct one for the ThinkPad T420 model. A universal AC adapter is a possibility if yours is unavailable or backordered.
Simple indications of a weakening charger
- Battery does not charge up whatsoever
- The unit will not work using just the AC power adapter
- Most Lenovo AC adapters will get warm to the touch when plugged in for any length of time
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