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I am looking for a solution to power a raspberry pi connected to a lcd screen 10 inch with three Lipo batteries 3.7V 5000mAh connected to two BMS 3S for charge and discharge. I designed the following circuit but I doubt, if it's correct. In case this is correct which is the battery life in hours?

Thanks

enter image description here

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    \$\begingroup\$ Does the BMS manual really say that you can connect them in parallel? \$\endgroup\$ – pipe Jan 30 at 13:33
  • \$\begingroup\$ hello, currently I don't found this information in the BMS data sheet. \$\endgroup\$ – A. SAAN Jan 30 at 13:58
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Without the manual for the BMS it is hard to give an authoritative response, but I really don't think that you can connect these devices in parallel.

A BMS typically want "single access" to the batteries in question to control current and/or voltage. One BMS does not know how much current to add to the flow if there is another one which it has no control over.

It could work if there was a secondary communication of some sort between the boards, but it appears to lack such a feature.

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