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Well guys

Silverdodge
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Silverdodge

Silverdodge

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Well guys I did a damn fool thing I left my key on in my truck last night and it drained the battery is overnight the truck was off but I left the key on I unplugged the quadzilla this morning to jump-start it it took two cars to jump it and I let it run for 30 minutes  and drove around the city block but I had 14.2 volts before with the new batterys now it's 13.8 how long would it take to fully charge it idling it was above 25 last night 

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Tractorman

Tractorman

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I would put them on a slow charge for several hours (a 10 amp battery charger will do) .  When batteries are pulled down to nothing, it takes a long time to get a full charge.  Heavily discharged batteries have a fairly slow absorption rate, so no matter how much power you throw at them, they can only absorb so much energy in a certain amount of time.  Battery condition also plays a role.

 

- John

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IBMobile

IBMobile

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Recharging drained batteries by driving around or idling put a heavy load and strain on the charging system and should be avoided.  I don't think you could put a full charge back into the batteries and if the alternator is marginal it could be damaged.

The best way is like @Tractorman said "slow charge for several hours". 

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Mopar1973Man

Mopar1973Man

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Remember batteries discharged below 10.5 volts is considered damaged. Batteries should be recharged completely before even attempting starting and running the truck. Now, remember batteries that are damaged will typically take more current flow to keep topped off. Continued use of the damage batteries can cause alternator issues too.  I'm guilty of this as well being my batteries have been down below 10.5 volts twice and once to ZERO volts. So in my case, that cost me an alternator and PCM. When the alternator failed the field winding shorted to ground and shorted out the blue lead on the PCM burning a hole in the circuit board. It ruined the PCM and required replacement. 

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