Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Senior Member coolio's Avatar
    Join Date
    Dec 2009
    Posts
    177
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Reviving a dead bionx battery pack.

    I'm having an issue with a bionx battery pack that has been unused for a while. I bought it used, so there is no warranty on it. I found a page in the nycewheels site that recommends that you suspend the bike and pedal it until it recharges it enough to get a current. I tried it for 20 mins and it didn't work.

    I want to manually charge it with this SLA charger/maintainer to see if I can bring it back:

    http://www.amazon.com/BatteryMINDer-.../dp/B000P23HZS

    Would this work?

  2. #2
    Senior Member CigTech's Avatar
    Join Date
    Feb 2006
    Location
    Ohio
    My Bikes
    Schwinn Empire XL
    Posts
    1,555
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The answer is yes, no, and mabye if you have a LIpo Battery. But the If Bionx battery is a nickel metal hydride then NO.

    First of all, we'd need more information on what's in the battery box. They have a 24v nickel metal hydride or a 36V Lithium Ion battery pack.. If you hvae the LIPO4 then only if it has a BMS in i. It you have a Lithium Ion battery then NO because most Lithium Ion battery do not have a BMS in the pack. If you have the nickel metal hydride then NO because of no BMS as well. Some have charged bms equipped lifepo4 with a BMS with sla chargers for months with no damage

    Bottom line, if your SLA charger undercharges your pack, you are likely to be ok with it. If it overcharges it, it might ruin it.

    The main difference with a lithium charger is that when done, it shuts completely off. Later, when the bms (if present) works to drain down high cells, it might be capable of turning back on again, and bringing up the lower charged cells.

    An SLA charger will go into a float charge mode. It never shuts completely off. It will provide a very small trickle of power at a constant voltage, designed to keep a lead battery topped up. Lithium batteries don't need the top up, and might be damaged by overcharging. In the case of the SLA charger I was using, it finished about 2v undercharged, so there was little chance of it overcharging my lifepo4. If it began to, the bms would start slowly draining any overcharged cells.
    Last edited by CigTech; 05-12-13 at 04:20 AM.
    May your feet keep move'n with the wind to your back.

    CigTech

  3. #3
    Senior Member
    Join Date
    Aug 2011
    Location
    Western Canada
    My Bikes
    E+ kit, Tidal Force, Merida
    Posts
    324
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    when LITHIUM BIONX battery voltage drops below 10V BIONX charger no longer can recognize it and will not start charging.
    YOU have to open battery and rise voltage manually SLOWELY but steady to at least 30V /again I talk about LithiumBIONX/
    The way to do it is to connect wall adaptor with DC output at least 40V and 0.5 Amps directly where battery connects to BMS, simply to charge outside BMS. It must be DC output adaptor /check label on it/ not AC output.
    You must monitor voltage every couple of hours not to overcharge.
    Again you want to do it slowely so no more than 500mA /0.5A/
    instead of wall adaptor you can use lab power supply with current udjusted at no more than 500mA.

    Bionx battery is 36V so I imagine 12V charger would have to be used to charge 3 section of battery seperate.

  4. #4
    Senior Member coolio's Avatar
    Join Date
    Dec 2009
    Posts
    177
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the responses. Yes, it is a 36v LiMn system. And, the bionx pack is the battery pack with the BMS built in to the unit. So, you have the battery pack and there is a circuit board within this little case where all the components are.

    I asked about the charger that I listed up there because it is one I already own. Powell, would I have to buy another special charger? Funds are kind of tight and wanted to do this with some chargers that I already have. Here's the page I referred to about boosting your pack by pedalling:

    http://www.nycewheels.com/bionx-diag...-recovery.html

    the battery pack is shrinkwrapped with some kind of plastic. I guess I have to take it all apart?
    Last edited by coolio; 05-13-13 at 09:26 AM. Reason: details about battery.

  5. #5
    Member
    Join Date
    May 2007
    Location
    Washington, DC area
    My Bikes
    Tidalforce S-750X, M-750, iO Cruiser
    Posts
    31
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by coolio View Post
    the battery pack is shrinkwrapped with some kind of plastic. I guess I have to take it all apart?
    Just make a single slit down one side. That way you can rewrap the battery with the same shrinkwrap and tape it back together much more easily with some clear wide tape.
    2x Tidalforce S-750X stock, TidalForce M-750X with A123 20Ah prismatic, Tidalforce iO cruiser stock, eBikes.ca Large Screen Cycle Analyst, GoPro HD Hero 2, Pair of DX HA III P7 headlights and a MJ-818 P7 taillight, Planet Bike Superblinky, Thudbuster LT. Topeak MTX racks and EX trunk bag.

  6. #6
    Newbie
    Join Date
    Jun 2013
    Posts
    1
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    quick ?:

    Quote Originally Posted by CigTech View Post
    The answer is yes, no, and mabye if you have a LIpo Battery. But the If Bionx battery is a nickel metal hydride then NO.

    First of all, we'd need more information on what's in the battery box. They have a 24v nickel metal hydride or a 36V Lithium Ion battery pack.. If you hvae the LIPO4 then only if it has a BMS in i. It you have a Lithium Ion battery then NO because most Lithium Ion battery do not have a BMS in the pack. If you have the nickel metal hydride then NO because of no BMS as well. Some have charged bms equipped lifepo4 with a BMS with sla chargers for months with no damage

    Bottom line, if your SLA charger undercharges your pack, you are likely to be ok with it. If it overcharges it, it might ruin it.

    The main difference with a lithium charger is that when done, it shuts completely off. Later, when the bms (if present) works to drain down high cells, it might be capable of turning back on again, and bringing up the lower charged cells.

    An SLA charger will go into a float charge mode. It never shuts completely off. It will provide a very small trickle of power at a constant voltage, designed to keep a lead battery topped up. Lithium batteries don't need the top up, and might be damaged by overcharging. In the case of the SLA charger I was using, it finished about 2v undercharged, so there was little chance of it overcharging my lifepo4. If it began to, the bms would start slowly draining any overcharged cells.

    hi, I'm trying desperately attempting to revive a dead 36 volt Bionx battery; and like the approach. Given the high cost of a replacement battery - I thought the following purchase would do the trick: http://www.amazon.com/gp/product/B00...=ATVPDKIKX0DER

    The only question I have is where to connect the leads in order to effectively bypass the BMS. Not that access is easy - but man, would a photo of which leads to connect to would be hand; or perhaps a good description with colors, et al.

    Thanks a million.

  7. #7
    Senior Member
    Join Date
    Aug 2011
    Location
    Western Canada
    My Bikes
    E+ kit, Tidal Force, Merida
    Posts
    324
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    very nice unit
    I also cannot provide photo.
    you must find beginning of string of cells , where is plus and where is minus.
    Last edited by powell; 06-15-13 at 06:34 PM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •