BMS + Balance Lead ?

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UncleZeb

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Nov 10, 2020
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Simple question for the doyens. When connecting a separate, external balance lead, to an existing battery pack with BMS, is it just a matter of soldering the corresponding cable leads to the balance points on the BMS or parallel packs, in order to charge the pack using the external balance lead ? The original battery pack charger, with XT60 female connector ONLY, has packed up, and the new charger has a balance port for the balance lead.
 

floydR

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Aug 23, 2017
Messages
1,326
Solder external balance leads to the corresponding balance points on the pack, make sure you have a charging port on the pack that matches the new charger. You don't charge a pack with the balance leads
later floyd
That is if I understood your question correctly
 

UncleZeb

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Nov 10, 2020
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25
Cheers floydR 🍻 Balance leads just for individual pack monitoring ;) Okay to connect an extra xt60 lead directly to B+/B- off the battery pack, to discharge bypassing the BMS ? (y)(n)
 
Last edited:

floydR

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Aug 23, 2017
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1,326
Not ideal but for some purposes it is done. RC batteries often are this way I believe, Charged with a balance charger. which you have. What is the battery for?
If the battery has a BMS and you bypass it, You remove the safeties that the bms provides: overcurrent, undervolt, overvolt etc.
Later floyd
 

floydR

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Joined
Aug 23, 2017
Messages
1,326
Ok then is the bms amp rating large enough for your boats, if so there is no reason to bypass the BMS. the usual reason to charge with balance charger and discharge from The battery terminals is weight/size limits in RC cars/ RC planes maybe even RC boats. Hopefully someone with more knowledge on the subject will respond.
later floyd
 
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