On my application I have four 200 mAh LiFePo4 cells, configures as sereies of two parallels, thus achieveing a 6.4V battery.
I understand this cells in series need balancing, I would like to leave this mattar aside for now, only keeping in mind that the cells are being balanced.
I'm drawing 130mA from the batteries for 1h, recharging them afterwards with ~10mA.
At some point they get stable at 3.45V, not the 3.6V it suppose to achieve. After this, with the same load, they discharge in minutes.
Any ideas of what could be happening for the batteries not achieving maximum charge voltage and discharging with such speed afterwards?