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  1. #1
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    Default Why doesn't my laptop battery recharge back to 100%

    Hi,

    A few weeks ago, I bought a brand new laptop battery. After my first charge, the battery indicator on my machine went to 100%. I have charged it 7 times. Sometimes partial, other times when the batter is low. If the battery is low, I would start it from 25% and it would go as far as 96%. I have charged it at 7% and have left it overnight with it not going as higher than 94% at the most, the last time I remember.

    Now after a number of discharge cycles, my battery reading will not progress higher than 86% even leaving the laptop over night still charging. It seems though, the more I leave the laptop on charging, the figure keeps going down and will not go higher or even back to 100%

    Can anyone explain why this happens and what I should do to rectify this problem.

    Thanks.

  2. #2
    Mostly harmless member kingdragonfly's Avatar
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    Default Re: Why doesn't my laptop battery recharge back to 100%

    what's the laptop model, and what O/S is installed?

  3. #3
    Computer Tech
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    Default Re: Why doesn't my laptop battery recharge back to 100%

    Is the new battery a 3rd party one or a genuine one made by the same company as the laptop?

  4. #4
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    Default Re: Why doesn't my laptop battery recharge back to 100%

    either that battery is faulty or the laptops charging system is faulty
    I'd bet the batt is faulty. Try & get a warranty replacement batt.

  5. #5
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    Default Re: Why doesn't my laptop battery recharge back to 100%

    Quote Originally Posted by kingdragonfly View Post
    what's the laptop model, and what O/S is installed?
    Hi.
    My Laptop is a Toshiba Satellite L10 with Windows 7 as my OS.

  6. #6
    amateur expert dugimodo's Avatar
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    Default Re: Why doesn't my laptop battery recharge back to 100%

    What was the problem with the old battery and what's the run time on the new battery like? Maybe it has a dodgy cell, if you are competent with a voltmeter check the voltage after a long charge. With no load it should be higher than the rated voltage of the battery. I'm not familar with the charged voltage of lithium batteries as normally used in laptops but a 12V lead acid for example will charge to around 15V and a 1.2V NiCad or NiMH will charge to 1.5V

    Contact whoever you purchased it from and describe the problem. It's always best when new stuff appears to be faulty or not functioning right to go straight back to the supplier. It should be under warranty.
    The ITX game machine; Bitfenix prodigy, 550W PSU, i7 3770, 8Gb RAM, 256Gb SSD, R9 290

  7. #7
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    Default Re: Why doesn't my laptop battery recharge back to 100%

    Quote Originally Posted by CYaBro View Post
    Is the new battery a 3rd party one or a genuine one made by the same company as the laptop?
    The battery I got was PA3420U from Trademe on the 27 September. I selected this one because it was also the same model as the original Toshiba brand. Although it is not a Toshiba brand, the auction did state it was a replacement and has RoHS as the brand. Unfortunately, I went for the one I could afford at the time. It costed me $71.99 and I did not take brand into consideration. Now thinking on that note, the orginal was Toshiba, but did not last very long; roughly speaking an hour. This battery does last longer and charges quickly, but does not allow me to recharge back to 100%.

    Thanks

    Product_Description:
    Cell Type: Li-ion
    Voltage: 14.8V
    Capacity: 5200mAh
    Color: Black


    Compatible Part Numbers:
    PA3420U-1BAC
    PA3420U-1BAS
    PA3420U-1BRS
    PA3450U
    PA3450U-1BAS
    PA3450U-1BRS
    PA3506U-1BAS
    PA3506U-1BRS
    PABAS059


    Fit Toshiba Laptop Models:

    Toshiba Equium L20-197 L20-198 L20-264

    Toshiba Satellite Pro L10
    Pro L10-113 L10-233 L10-271

    Toshiba Satellite Pro L100
    Pro L100-102 L100-106 L100-107 L100-123 L100-124 L100-125 L100-132 L100-134 L100-135
    L100-136 L100-137 L100-138 L100-142 L100-154 L100-156 L100-157 L100-158
    L100-160 L100-176 L100-195 L100-196

    Toshiba Satellite Pro L20
    Pro L20-102 L20-103 Pro L20-137 L20-174 L20-211 L20-258 L20-259

    Toshiba Satellite L10
    L10-100 L10-101 L10-103 L10-104 L10-105 L10-108
    L10-130 L10-144
    L10-151 L10-154
    L10-190 L10-193 L10-194
    L10-226 L10-269 L10-270 L10-272 L10-281

    Toshiba Satellite L100
    L100-103 L100-104 L100-105 L100-111 L100-112 L100-113 L100-119
    L100-120 L100-121 L100-129 L100-130 L100-133 L100-134 L100-140
    L100-141 L100-165 L100-170 L100-171 L100-173 L100-175 L100-179
    L100-185 L100-189 L100-194

    Toshiba Satellite L15 L25

    Toshiba Satellite L20
    L20-101 L20-112 L20-120 L20-121 L20-153 L20-155 L20-157 L20-159
    L20-173 L20-188 L20-196 L20-217 L20-257 L20-260 L20-267 L20-268
    L20-S310TD

    Toshiba Satellite L30
    L30-101 L30-105 L30-10P L30-10S L30-10V L30-10X
    L30-113 L30-114 L30-115 L30-11D L30-11E L30-11G
    L30-134 L30-135 L30-140 L30-142

    Toshiba Satellite L35
    L35-S1054 L35-S2151 L35-S2161 L35-S2171 L35-S2174 L35-S2316 L35-S2366 L35-SP1011 L35-SP2011

    Toshiba Tecra L2

  8. #8
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    Default Re: Why doesn't my laptop battery recharge back to 100%

    Quote Originally Posted by dugimodo View Post
    What was the problem with the old battery and what's the run time on the new battery like? Maybe it has a dodgy cell, if you are competent with a voltmeter check the voltage after a long charge. With no load it should be higher than the rated voltage of the battery. I'm not familar with the charged voltage of lithium batteries as normally used in laptops but a 12V lead acid for example will charge to around 15V and a 1.2V NiCad or NiMH will charge to 1.5V

    Contact whoever you purchased it from and describe the problem. It's always best when new stuff appears to be faulty or not functioning right to go straight back to the supplier. It should be under warranty.
    Yes most definetly I will consider contact that person. The old problem according to Windows 7 (kept popping up with a message telling me to replace it), so since this is my first laptop, I took this as a warning sign to buy a brand new one instead. I am not comfortable working with electronic equipment unfortunately, though I will take your advice about making contact. I took it on upon myself to ask expert advice first here before making a final decision. You just never know, it could be something simple, and I am no expert with laptops.
    Cheers.

  9. #9

    Default Re: Why doesn't my laptop battery recharge back to 100%

    You could download this battery monitoring program: BatteryMon. If when you run it (both charging and discharging the battery), you should see smooth steps in the charge level. If the charge level plot has sudden jumps in it, you have bad cell in the battery.
    Nothing happens until something happens

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