How do I know when my 12V battery is fully charged?
Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts. If you don’t have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights.
How does battery drain when turning key to ” start “?
Instantly upon turning key to Start, fully charged battery drained to less than 4 volts – either of two batteries. Instantly! With everything off and all fuses and circuit breakers removed, get +9.5 volts between negative pole of battery and ground at alternator mounting frame. Same with either small wire disconnected from battery post on solenoid.
What should the voltage of a battery be when it is fully charged?
Cannot reach higher than 10.5 volts when being charged, then the battery has a dead cell Fully charged (according to the battery charger) but the voltage is 12.4 or less, the battery is sulfated Sulfation is the natural byproduct when the battery discharges.
How to disable battery charge while plugged in and?
When the battery reaches 100% the CPU tells the adapter it is full and not to charge the battery any more. It then bypasses the charging and switches just to the laptop. If you need further assistance please start a new post as I no longer will be a part of the HP Support Community. Solved! 11-03-2017 02:00 PM
What should voltage drop be on 12 volt battery?
12-volt system: 0.500 volts maximum voltage loss 24-volt system: 1.000 volts maximum voltage loss 2) Replace cables or repair circuits with excessive voltage loss. If the voltage drop exceeds specification, check for corrosion, frayed strands of wire, loose connections or a battery cable gauge that is too small.
What does 13 volts mean on car battery?
If the battery is fully discharged, but the car battery shows 13 volts, the first estimation for the charge time can help tell you how long it’ll take to recharge the battery to almost the max capacity.
Cannot reach higher than 10.5 volts when being charged, then the battery has a dead cell Fully charged (according to the battery charger) but the voltage is 12.4 or less, the battery is sulfated Sulfation is the natural byproduct when the battery discharges.
12-volt system: 0.500 volts maximum voltage loss 24-volt system: 1.000 volts maximum voltage loss 2) Replace cables or repair circuits with excessive voltage loss. If the voltage drop exceeds specification, check for corrosion, frayed strands of wire, loose connections or a battery cable gauge that is too small.
Why does my car battery go down to 3 volts?
You can accidentally over-discharge your car battery beyond what it is intended to withstand, causing a 12-volt battery to go down to 3 or 4 volts, or make it misread, with the car battery showing 13 volts. Many lead batteries do not respond well to being over-discharged or overcharged, but some can recover to 8 or 9 volts without recharging.