Kyros MID7015 died

Discussion in 'Coby Generation 1' started by PinkiPad, Mar 10, 2012.

  1. PinkiPad

    PinkiPad Member

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    Haven't used it in about 2 months. It was dead so I thought the battery was dead. 8 hours of recharging and nothing. 4 more hours. Nothing.

    How can I reset it or diagnose why it apparently won't charge?
     
  2. Spider

    Spider Administrator Staff Member

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    It's possible the battery has been damaged by improper storage and will need to be replaced.

    Over-discharging Lithium-ion

    Li-ion should never be discharged too low, and there are several safeguards to prevent this from happening. The equipment cuts off when the battery discharges to about 3.0V/cell, stopping the current flow. If the discharge continues to about 2.70V/cell or lower, the battery’s protection circuit puts the battery into a sleep mode. This renders the pack unserviceable and a recharge with most chargers is not possible. To prevent a battery from falling asleep, apply a partial charge before a long storage period.

    Battery manufacturers ship batteries with a 40 percent charge. The low charge state reduces aging-related stress while allowing some self-discharge during storage. To minimize the current flow for the protection circuit before the battery is sold, advanced Li-ion packs feature a sleep mode that disables the protection circuit until activated by a brief charge or discharge. Once engaged, the battery remains operational and the on state can no longer be switched back to the standby mode.

    Do not recharge lithium-ion if a cell has stayed at or below 1.5V for more than a week. Copper shunts may have formed inside the cells that can lead to a partial or total electrical short. If recharged, the cells might become unstable, causing excessive heat or showing other anomalies. Li-ion packs that have been under stress are more sensitive to mechanical abuse, such as vibration, dropping and exposure to heat.

    From this article: Charging Lithium-Ion Batteries
     
  3. PinkiPad

    PinkiPad Member

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    Thanks. Odd how it just discharged like that.

    Assuming the battery needs to be replaced, what type specifically do i need? I will get it at Amazon but need specifics. I have Lithium-ION, about the size of a nickel, but they aren't close to me to check the specific siz

    And, is there a site that reminds me how to change battery? The instruction book is MIA.

    PS: Found the user guide online as well as the answer to my problem. I'm screwed.

    2450mah 3.7v. you have to desolder the red and black leads off the board.

    Guess I can try to sell it or something...


     
    Last edited: Mar 11, 2012
  4. chastings

    chastings Member

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    The one for my kyros is getting a little short-lived...
     

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