I have three Victron 25,6V 200A Smart Lithium batteries in parallel. BMS is a Victron Lynx smart BMS500. After having kept them at 70% SoC for about a month (long time storage) I activated charging with shore power and Multiplus-II. They all reached 100% SoC within approximately three hours.
4,5 hours after SOC 100% I checked the Victron Connect bluetooth and found that two of them was in “Balance” while the third is “Imbalance” even if the internal cell voltage on all celles in this battery are the same 3.35 V. Last time I checked, in desember 2025, all three batteries was in status “Balance” at SoC 100%
I restarted he charging after having reduced the SoC to 98% but the battery still remain “Imbalance” even after 48 hours after the SoC reached 100%.
SP-II charge mode remains in “Absorption” all the time. Why is that, and what to do to get the battery balanced..?
27.0V absorption suggests the charge parameters are not set properly. Victron recommends 28.4V for their lithium smart batteries. That would be 3.55V per cell. If i remember correctly at least 3.5V are necessary to start balancing
I have been deceived by the state: “Absorption charging” in the VRM Remote console. I should have payed attention to the Voltage instead.
When can I expect the state to be: “Float” ?
I do not think you see that if the Lynx BMS is managing the charging by DVCC, the MP has no idea if it is absorbing or floating, it receives a target voltage from the BMS, either 28.4V or 27.0V and it is either not able to achieve the target voltage and it shows bulk or it can achieve the target voltage and is limiting current to maintain this and it shows bulk.
AFAIK, for the battery to show balanced it has to be balanced at the end of absorption whilst still at 28.4V. It can be unbalanced at this point but once it gets to float and the current falls and the voltage drop away from the peak voltage it can come back into balance.
My system is located in a yacht which is lquite some distance from where I live. Is there any way to monitor the status of the battery balance remotely on VRM?
I turned off the chargig via VRM with the SoC 100%. When turned ON again after 10 mins the voltage remained at 27V. At what level of SoC should the charging voltage switch to 28,4V?
I have the Lynx NG BMS and batteries and am.less familiar with the older Smart Lithium, I do not believe you can see battery temperature and cell voltages through VRM with these.
In the Lynx BMS you have 2 settings, repeated absorption interval and SOC threshold. You will start another absorption if the times since the last one exceeds the interval, default 30 days, or the SOC falls below tje threshold, default 70%. All covered in the manual.
