Bluetooth feature on a battery used 6 times now fails to function -

• DW

  David Webb

  1/20/25, 11:43 PM

  I ourchased two batteries in Novermber 2023 -  They were handled with care, never exposed to water as they were inside a protective case, the amperage draw on them was minimal in each use case and they were never really taken below 90 % unless taken to a storage level by a sow draw from an inverter attached to a fan and USB light to take them to 60-75% discharge for storage purposes. 
  
  Yesterday, in checking one of them that was left at 68% 3 weeks ago I noticed it would not be detected by the app. I followed all App guidelines, reinstalled the app, wiped out the app cache and then reversed that order - wiped out the app chache, runinstalled the app, rebooted the phone and re installed the app. Then I checked that the same scenario was replicated on a differnt phone with a different opperating system. 
  
  The batteries eletrical paramters seem to be functional - in 2 hours it went to 13.3 V where I stopped charging for fear of a BMS failure and possible over charge scenario until I can sort out the BMS/BT problem. 
  
  I looked inside the at the top of the battery and there are no indications of water in the battery. I suspect that the BT capability of the BMS has died - a 50% failure rate :)  
  
  Is there anything else that can be suggested to resolve this aside from risking using this battery inblind faith, which is getting thin to be honest as this could result in a marine scenario fire on a personal water craft? 
  
  Can anyone show me where the BMS and or blue tooth radio are located ? Has anyone replaced this component before ? 

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• RS

  Russell Smith

  1/22/25, 6:07 AM

  Hi David,
  
  I'm only here because I/we have the same issue.
  Bought 4 a few months ago, and now two don't connect via bluetooth.
  
  Do yours show up in the list to connect to?
  Ours do, but then time out when trying to connect.
  
  I've not had the batteries apart yet though as all 4 are connected together, in a tight space under the deck on a narrow boat (off grid)
  
  If it helps, they use a JBD BMS, and it'll look something like this...
  
  IF you are feeling technical, and you can get to the BMS,

  I'd look at disconnecting the power to the BMS and seeing if a 'restart' helps
  
  

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