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As long as you don't have thousands of cycles on the existing batteries go ahead and add the two additional BB's. They are self contained batteries so if something goes wrong with one or more the internal BMS is designed to disconnect the battery from the electrical circuit.
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SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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