the battery starts charging when the charge remaining in the battery drops below 95%.This prevents the battery from charging frequently; Miniminzing the recharge cycles helps prolong battery life

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Why does my notebook battery with charge above 95% show it is not charging in Windows even though the AC adapter is connected?

According to the G750JZ user manual it is normal as in the screenshot below.

For these newer models once the battery charge reaches 100%, the battery will drain below 95% before it starts charging again even while plugged into the AC adapter.

Older notebook models may not follow this behavior and keep the battery charge at 100% while plugged in.