Dewalt 18 volt battery mod series#

An interesting note, here, is that I measured no current across any pins except the TH pin.Ĭhart (noisy because of cheap equipment):

At that second milestone, it maintains a voltage of ~19.6V and notifies the user that charging is complete by triggering the 'TH' pin. What I learned, in broad strokes, is that the Dewalt charger applies a constant current of 4A until the output reaches around 19V, then it switches to a constant current of 2A until the output must be around 19.8V. Here's a rudimentary diagram of my setup: This gave me access to measure each cell in the battery as well as some control signal inputs. I don't have access to any more sophisticated equipment than a basic multimeter, so I bought some ACS712 chips off amazon, ran wires from the charger to each of the pins on the battery, individually. To understand what it takes to charge a DeWalt battery, I built a test rig, depleted a battery, and sampled the current and voltage during the charging with 1 battery and 1 stock charger. I'm getting a little out of my depth, so I thought I'd see if anyone has any ideas. I could use help designing the circuit to control the charging. Part of this project will be making a circuit that can charge all 9 of these at once, without removing them to put them on a separate charger.

Dewalt 18 volt battery mod series#

I'd like to use DeWalt 20V 5Ah batteries to supply this power, 3 in series x 3 in parallel (9 total). I'm working on a project that will require a 60V DC (mobile) power source.