Thanks for the help,
I added a schema, the battery and motors links.
I didn’t find a lot of technicals information on the product page.
The battery charge normaly, it is working ok with the screen and the leds.
That means nothing, the battery can be completely ruined (unable to power motors), yet
still manage a small fraction of an amp to power screen/leds
I m not sure how to test the consumtion of the motors,
Do you have a clamp-style ammeter? That could measure high currents without disrupting the circuit.
Most multimeters only have a 10A max range - that might be worth trying though.
but when I do a test with both motor running,
I m starting with 12.6v and after 10 second running (the battery goes to 11.4), the battery then stayed at 12.6
I did this test with the robot elevated so the weel don’t touch the floor, maybe the motor need more power when they move the robot.
If the battery drops that much voltage in 10 seconds with unloaded motors, its definitely ruined. Yes, a motor under load will
need more power, a lot more power than an unloaded motor.
Did you read my post about lead acid batteries needing regular charging and to be stored fully charged?
I forgot to mention there that they will not tolerate over-discharge either, that will reduce the capacity greatly.
Never let a 12V lead-acid battery drop below 10.5V, preferrably 11V, and recharge it immediately its discharged.
These batteries are difficult to look after unless they are used regularly and recharged every time, as in a