You are asking a lot of something that is mass-produced and lands on your doormat for only £50. It has managed to balance your cells to within 0.24% and to reach the voltage limit within 1.5% when the measurement device only has an accuracy of 0.8%.
With all of that, you will also be within 0.5% of the voltage of every other competitor, and have well looked after cells able to last a full season. And when we had NiMh cells...
I have one of these chargers. It is very reassuring to know that it is roughly right, and not precisely wrong.
If you want a Bantam for half price, I have one that will be going on the For Sale board soon. Excellent condition, with leads, in box. The Core UAC-50 that replaced it (needed the higher charging rate, nothing wrong with the Bantam) seems to me to be identical in performance, but way less robust in its plastic case - the Bantam is metal. HTH
