Rant- No product specs

[redpoint5]

It's just weird that Ryobi uses nominal voltage with their 18v line, but fully charged no load voltage with their 40v line. There should be consistency.

They might as well call their 18v line 20v, and trick everyone into thinking it's 2v better than competitors.

...now, about zero calorie energy drinks

Originally Posted by aerohead

When mowing with a friend's 40-V Ryobi, I noticed that, when under higher load, the motor appears to literally 'power-up' as if it's transitioning from 20-VDC, to 40-VDC out of the pack.
And My 80-V Cobalt and 80-V Atlas mowers do exactly the same thing, as if under light load, their just 'loafing' on half-voltage.
A VOM shows that the pack IS 'compartmentalized', into two 40-V 'halves.'

I need to figure out how to trigger that state with a button because it's useful to have higher blade speed when picking up leaves.

[aerohead]

Originally Posted by redpoint5

I need to figure out how to trigger that state with a button because it's useful to have higher blade speed when picking up leaves.

Looking at the removed motor, there appears to be a dedicated lead entering the case, which might sense some eddy current back-EMF or something when 'loaded', signaling the inverter to transition to the higher power setting.
Mimicking that signal ought to trigger the same response.
They really 'mulch' better at the higher power, I can see how they'd do with the leaves.

[Piotrsko]

Originally Posted by redpoint5

I've got an order in for a Chinese knock-off 6Ah battery. I expect to receive a 5Ah. It'll probably take a month or two in shipping.



I don't have a charger that will go that high. I'm going off the manufacturer supplied charger, so it's reasonable to test their stated figures using the equipment they gave me.

If you're at 40.6 The charger has the extra headroom but it is regulated down otherwise it wouldn't get to 40.6. How much extra is the question. My old 18 NICAD charger goes to 24v

On a brushed motor how the fields are connected affects performance, but I was under the impression that the newer stuff was BLDC

[Autobahnschleicher]

Interesting, meanwhile Bosch prints the important specs directly onto the battery.
Although I have not verified their capacity when they where new, my old 2.0AH batteries hold up pretty well still (unless I use them in my anglegrinder, but that thing just draws wayyy too much power for such small batteries)
On their website, they also list how long what charger takes to charge them and for some tools how long they run on what battery.