I have the following battery, but not its original charger:
- 12 V, 4.0 Ah
- Cell Balancing Longer Battery Life Increased Battery Lifespan. Higher Battery Resources Due To Evenly Used Cells.
BTW internally it has 6 cells, so 2 packs in parallel
I will charge with a generic charger Imax B6 that has a display to monitor the voltage.
By default the closest to 12 V option offered by the charger is a predefined 11.1 V / 0.5 A
I am aware that c1 (4 A) is recommended and not bad for life span, but as I am not in a hurry I can charge at any rate as far as it increases the life span.
So 0.5 A is C/8, seems too small a rate and slow. Can 0.5 A be bad or worse than a 1 A (C/4) or 2 A (C/2)?