# Voltage mismatch from parallel connected Lithium Smart batteries

**URL:** <https://community.victronenergy.com/t/voltage-mismatch-from-parallel-connected-lithium-smart-batteries/39846>\
**Category:** DIY\
**Tags:** domestic, parallel, lithium\_battery, victronconnect\
**Created:** [17 July 2025 17:39 UTC](https://community.victronenergy.com/t/voltage-mismatch-from-parallel-connected-lithium-smart-batteries/39846 "2025-07-17T17:39:31Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Steve85737](https://avatars.discourse-cdn.com/v4/letter/s/54ee81/32.png) [@Steve85737](https://community.victronenergy.com/u/Steve85737)\
**Post date:** [17 July 2025 17:39 UTC](https://community.victronenergy.com/t/voltage-mismatch-from-parallel-connected-lithium-smart-batteries/39846/1 "2025-07-17T17:39:31Z")

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I’ve got 2x 25.6V 200Ah Victron Lithium Smart batteries connected in series, with another identical pair connected in parallel with them (i.e. 2S2P arrangement). They are connected to a thick copper busbar. The Victron Connect app reports the voltages of one series-connected pair as 52.04V (26.00 + 26.04) and the other pair as 52.34V (26.17 + 26.17). I’ve measured the voltage at the terminals with a multimeter and they both read 52.3V. It seems like the voltage reported by the BTV module in one pair of batteries is not quite accurate. Is there a way to recalibrate this?