24 Volt Lawn Mower Battery Charger for CMM1200 control terminal function

Dodgydave

Joined Jun 22, 2012
10,050
Two will be the 30V output, the 3rd Terminal is for Temperature control.

Edit...the charger could be designed to charge 2 X 12V Sla batteries together...
 
Last edited:

bassbindevil

Joined Jan 23, 2014
171
Or it could be a tap for balanced charging (a good feature, but unlikely), unused, safety ground, or a second negative terminal. I haven't come across SLA chargers that cared about temperature, although AFAIK automotive voltage regulators vary the output according to underhood temperature.

www.lawnmowerforum.com may be a good place to search further.

Personally, I'd prefer to charge the two 12V batteries separately, or add a balancer board, assuming the B&D charger doesn't do balanced charging.
 

Thread Starter

LAOADAM

Joined Nov 21, 2018
630
Or it could be a tap for balanced charging (a good feature, but unlikely), unused, safety ground, or a second negative terminal. I haven't come across SLA chargers that cared about temperature, although AFAIK automotive voltage regulators vary the output according to underhood temperature.

www.lawnmowerforum.com may be a good place to search further.

Personally, I'd prefer to charge the two 12V batteries separately, or add a balancer board, assuming the B&D charger doesn't do balanced charging.
Thanks,
Checked the three pins, the controller pin output 0, same as GND, shorten it to GND, no output, but the charger function good when plug into the mower. and even no short, there is no normal output, I mean some the red light on, some time not.

attached the inside:

POST-50.JPG POST-51.JPG
 

Dodgydave

Joined Jun 22, 2012
10,050
Ok how is the charget connected inside the mower to the batteries?

That way we can see what the third wire is for, it could be for temprature, as a temporary measure what voltage or resistance do you get from the mower on the Third wire to the others?
 
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