I think it’s really stupid and potentially dangerous that the concept of an absorption period of charging a lead acid battery has been transferred across to charging of lithium batteries.
Lithium batteries don’t need an absorption period, and in fact the absorption period, with its raised voltage, is likely to overfill the negative electrode with lithium ions. This overfilling can create cracks in the crystal structure of the electrode which will decrease the battery’s lifespan.
On top of that, in extreme circumstances the absorption period can risk the formation of dendrites that can cause a short circuit. Fortunately, lithium iron phosphate batteries have a significantly higher ignition temperature than other lithium-ion batteries. That’s probably why we haven’t been having too many problems.
In my opinion the absorption voltage provided by charge controllers should be reset at the same voltage as the resting voltage (54.4V for a 16 cell LiFePO4 ‘48V’ battery; 13.6V for ‘12V’; 27.2V for ‘24V’.)
It’s just teething problems for new energy.
For four decades The Echo has printed the stories some people loved, some people hated, and some pretended not to read. If you want us to keep telling the truth, the real truth, not the sugar-coated version. We’ll need your support to keep the presses rolling. 
