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  1. #1
    RC poster
    Join Date
    Dec 2013
    Location
    Australia
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    13

    Not like the other

    I've made the switch to lipo's and have a question regarding one battery. Mine are Traxxas 7600mah 2S2P. So far I have balance charged them twice and storage charged between uses at 3.85V / cell. My charger is a multi charger and not Traxxas so let's not discuss that.

    For both charges so far, Battery 1 charges as expected and stops when 'full' @ 8.4V, each cell balanced @ 4.2V. Battery 2 also reads 8.4V, each cell @ 4.2V but does not stop charging. The first time I stopped it when battery 1 stopped, today I let it run for 20 mins and 900mah more than battery 1 before stopping the charge.

    Is this an early sign that battery 2 has a problem?
    No such thing as a dumb question? Give me time.

  2. #2
    RC Turnbuckle Jr. rag6's Avatar
    Join Date
    Mar 2008
    Location
    PM me if ya wanna bash at Greenwood Bashplex in Pittsburgh PA
    Posts
    13,129
    Really strange...

    The battery that is taking forever to finish... Are both cells in pack 2 near 4.2 during the extended balance cycle?
    Last edited by rag6; 02-08-2014 at 01:51 AM.
    Wanna bash at Greenwood Bashplex in Pittsburgh ???

  3. #3
    RC poster
    Join Date
    Dec 2013
    Location
    Australia
    Posts
    13
    Each cell did get to 4.2V at the same time but then each one would slowly cycle between 4.2V and 4.19V.

    Multimeter readings before charging -
    Batt 1 - 7.64V, C1 3.817V, C2 3.820V
    Batt 2 - 7.64V, C1 3.814V, C2 3.823V
    No such thing as a dumb question? Give me time.

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