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Thread: Battery replacement

  1. #21
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    Quote Originally Posted by sgvparel View Post
    After my clinical rotations started I havent been able to pursue this project fully. But now I might have some time and am going to buy some Li-Po 3.7v cells and connect them and see if it work. I am sure NI did these batteries to cut cost and for the design. But I think they could have gone Li-Po like ipad. Acer Iconia has a 7.4v 3000+mAh cell. Anyway I am going to order them tonight. hopefully work on the connections and charging in the next week or so. Although it worries me I seriously dont want to end up like what PsychodelEKS's project ended up with. Will post the results then.
    Any luck?

  2. #22
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    The three cells used are Sanyo 18650 (Korean regulation R1112). The specifications are:

    Part number: UR18650A
    Type: Lithium-Ion
    Nominal Capacity: 2150mAh (0.43A discharge)
    Nominal Voltage: 3.60V (0.43A discharge)
    End Voltage: 3.0V
    Charging Current (Std.): 1.505A (0~+40C)
    Charging Voltage: 4.20V (+/- 0.03V)
    Charging Time (Std.): 3 hours
    Discharging Current (Std.): 1.075A (-20~60C)
    Discharging Current (Max): 2.15A (-20~60C), 4.30A (0~40C)
    Internal Resistance: <100mOhms (AC impedance 1kHz)
    Length: 64.9mm
    Diameter: 18.3mm
    End tab diameter: 9mm

    Maximum discharge current as a single cell is as above. However after assembling to a battery pack there is the limitation of maximum discharge current because of protection circuit and protection device.

    Charge current must be below 2.50A per cell. Charging voltage must be 4.20V. In case of a battery voltage below 3.0V it should be charged with pre-charge current below 0.1A. When the voltage exceeds 3.0V the standard charging rates can be used. Do not constant (trickle) charge. Do not over-discharge below 2.0V per cell. Do not charge outside temperature range 0~40C.
    Last edited by IntuitiveNipple; 05-17-2012 at 11:48 PM.

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  4. #23
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    Quote Originally Posted by IntuitiveNipple View Post
    Do not constant (trickle) charge.
    Does this mean that we should not leave the Adam plugged in to the charger all the time?
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    Quote Originally Posted by kwilson73 View Post
    Does this mean that we should not leave the Adam plugged in to the charger all the time?
    No. That directive applies to the battery controller circuit the cells are connected to. Because Li-ion cells have such stringent requirements all battery packs have a micro-controller attached that manages the charging and discharging of the cells and monitors their temperature. The micro-controller is loaded with firmware that tells it the specifications of the cells connected to it. The micro-controller can communicate with the host usually using something like an IIC (I2C) bus. It is responsible for charging the cells regardless of an external power source being connected.
    Last edited by IntuitiveNipple; 05-17-2012 at 11:49 PM.

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  7. #25
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    Quote Originally Posted by skippyi View Post
    Battery replacement by NI is feasible. I just sent my Adam to them so that they can change battery.
    Cost? 30$ for the battery + 13$ work + shipping cost to the service center (20$n for me, I am based in Europe)
    Good to know. Mine is dying ... discharges to about 60% (or so) and then straight to zero and off. I'll either send it to India or the dustbin.
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    hi. any idea if NI has an option for a larger capacity battery?
    That said, is there any known cases of external battery successfully charging the Adam?

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    1. Please tell me who has the experience to replace the battery on Adam?
    2. If so, on what the battery replaced? What kind of battery parameters, where we bought ... a link, if there is ..

    Tell us about your experience.
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  11. #29
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    Thanks.This is great. can you please share more details?

    How many times does the battery charge the Adam to full?
    How about charging Adam with Zero Battery level Adam?
    many devices charge only from AC at zero level..for eg., psp..just would like to know the limits.

  12. #30
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    my Adam runs 5h with the. internal battery,after that I connect the external and have second 5h.No. AC plug is needed
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