Mathematical calculation of Trickle charge current per battery capacity

[Kiriakos GR]

I did dive in today, in to a charger datasheet of 2003, and I did discover the 1/60 rate

The "1/60" in relation to trickle charging refers to the recommended charging current rate as a fraction of the battery's capacity.
Specifically, it means the charger should provide a current equal to 1/60th (one-sixtieth) of the battery's Amp-hour (Ah) capacity.

Example Calculation
For a typical car battery with a capacity of 60 Amp-hours (Ah):
The recommended trickle charge current would be: 60 Ah * (1/60) = 1 Amp (A)

In my case, I was seeking  to discover the undocumented trickle charge current at the 9V ports of Ansmann Energy 16.
The charger underneath, it mentions maximum supported capacity per charging bay.
9V  supported capacity 100~400 mAh theoretical. 

I was not aware up to date, that Trickle charge current at chargers product design, this is calculated due the parameter of battery capacity.
So far I was speculating, that Trickle charge current, this has some sort of relation, with minimum penetration current Ni-CD theorem.

Regarding chargers product design,  the worst part this is measured accuracy specification for current output (constant current mode).
Most to all NiMH chargers, they deliver DC current at +/- 20% accuracy tolerance by design. 


The only way accuracy specification this to get more tight, this is by the use of an expensive micro controller, 10 Bit of better ADC, and lots of software code.
This requirement it might explains of why the pricing of Li-Ion fresh made chargers (product design 2022 and newer)  this is at the top dollar side. 

Ansmann Powerline Pro chargers, they have an tighten tolerance of DC current output error of +/- 10% .
And this improvement it also increases overall accuracy even at battery capacity measurements / benchmarks.