I have an Acer Aspire 5749 with every thing Genuine, UN-touched regarding repairing or replacement. The battery of laptop is Lithium-ion based of 66 Watts and i bought this laptop new from market in Jan 2012. From last 2 months, battery was not charged, when ever notebook starts, the charger was pluged-in so about 3 days back, when i use laptop till 15% battery remaining i find out that battery charge rate is too slow @ 2.6 Watts/hour whereas 2 months back when i ever charge the battery, it charge @ 17 watts/hour as shown by Windows 7 battery meter.
The funny thing is battery charged @ 2.6 Wh till 75% and from 75% to 100%, the battery charge rate is @ 17 W/h as it happen in past.
Note: i mostly used my notebook with AC plug-in from 1st day of purchase of laptop and i was using my notebook on battery till 40% or 35% once in month as i heard from some one that its good to discharge & charge battery once a month for battery health. From last 2 months i rarely use this notebook.
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Check ScreenShot of battery meter:
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The Battery meter had shows 17 W/h charge rate when ever i charge my battery usually from 30% ( before 2 months ) but i do not use laptop on battery in last 2 months So charge rate decreased to 2.5 Wh.
My problems are
Why charge slow @2.6 W/h till 75% and why it charge usually (Faster) after 75% charging !
Should i discharge (till 10%) and than charge the battery and repeat this 4 or 5 times !
