Charging voltage for stock battery - Toyota Yaris Forums

Vinceb · 02-11-2011, 06:02 PM

So I was smart enough to leave the lights on the other day, drained the battery to nothing. Attempted to start the car, not even a click for the starter, no power for anything.
Took the battery to Canadian Tire, put it on their battery tester, 30 min later the guy tells me it's no good. He said it has a bad cell and won't take any kind of a charge and that I need to buy a new one

.

Decided to get cables from a friend of mine, took it home, re-installed the dead battery and jumped it. let the car run for 20 min with nothing turned on.

Took the car for a drive for 15 - 20 min came home and checked the battery, this is what I got:

13.90 volts - Charging with everything turned on, fan, lights, rear defrost, head lights.
13.06 volts - Car turned off for 5 min
12.82 volts - 3 hours later, car not running in between

13.95 volts - 2 days later fan and day time running lights on.

Does this seem normal? should it be charging at 14.2 - 14.5 ??

Toyota wants to charge me to test it and then they will give me a pro-rated price on a new one if it's bad. the car has been idling a little low, kinda rough since this happened (450 - 500 RPM). I've already driven 150km made up of several trips so the computer should have reset by now.

Canadian Tire Eliminator battery: $95
Toyota Stock battery: $135 (+ testing of $25)

130,000 km on the car, 2.5 years old

severous01 · 02-11-2011, 08:26 PM

you're fine. anything over 12.6v is considered 'charging'...but, 13.9 is a little on the low side but you're fine. you dont want too much either...that's just as bad.

and as long as you dont go below 12.0v you're fine. that's considered a dead battery.

starting voltage should be in the 10.5v range and then immediately come back up when the alternator kicks in.

CTScott · 02-11-2011, 09:06 PM

Smart chargers are idiot proof - They won't attempt to charge the battery if it is below a certain threshold to prevent things like accidentally charging a 6 volt battery with a 12 volt charger. If my smart Sears charger refuses to charge a battery I have to dig out my 1950's Marquette charger (that I inherited from my grandfather), since it has no safety features.

gonzo452001 · 02-12-2011, 12:10 AM

14.1 volts is as high as my goes using my scan gaugeII

02-11-2011, 06:02 PM	#1
Vinceb Drives: 2008 5 Speed Sedan Join Date: Jan 2011 Location: Nova Scotia, Canada Posts: 77	Charging voltage for stock battery So I was smart enough to leave the lights on the other day, drained the battery to nothing. Attempted to start the car, not even a click for the starter, no power for anything. Took the battery to Canadian Tire, put it on their battery tester, 30 min later the guy tells me it's no good. He said it has a bad cell and won't take any kind of a charge and that I need to buy a new one. Decided to get cables from a friend of mine, took it home, re-installed the dead battery and jumped it. let the car run for 20 min with nothing turned on. Took the car for a drive for 15 - 20 min came home and checked the battery, this is what I got: 13.90 volts - Charging with everything turned on, fan, lights, rear defrost, head lights. 13.06 volts - Car turned off for 5 min 12.82 volts - 3 hours later, car not running in between 13.95 volts - 2 days later fan and day time running lights on. Does this seem normal? should it be charging at 14.2 - 14.5 ?? Toyota wants to charge me to test it and then they will give me a pro-rated price on a new one if it's bad. the car has been idling a little low, kinda rough since this happened (450 - 500 RPM). I've already driven 150km made up of several trips so the computer should have reset by now. Canadian Tire Eliminator battery: $95 Toyota Stock battery: $135 (+ testing of $25) 130,000 km on the car, 2.5 years old

02-11-2011, 09:06 PM	#3
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	Smart chargers are idiot proof - They won't attempt to charge the battery if it is below a certain threshold to prevent things like accidentally charging a 6 volt battery with a 12 volt charger. If my smart Sears charger refuses to charge a battery I have to dig out my 1950's Marquette charger (that I inherited from my grandfather), since it has no safety features. __________________

02-12-2011, 12:10 AM	#4
gonzo452001 Drives: 3-door liftback blazing blue Join Date: Oct 2006 Location: French Lick,IN Posts: 185	14.1 volts is as high as my goes using my scan gaugeII __________________ 07 yaris LB 5-speed blazing Blue 07 yaris LB Auto Bayou Blue rostra cruise control oem style foglights 96tacoma 4x4 xcab I4auto Weathertech vent visors Scan GaugeII

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02-11-2011, 08:26 PM	#2
severous01 Drives: 2008 yaris, stripped, red Join Date: Jan 2009 Location: SE Texas Posts: 977	you're fine. anything over 12.6v is considered 'charging'...but, 13.9 is a little on the low side but you're fine. you dont want too much either...that's just as bad. and as long as you dont go below 12.0v you're fine. that's considered a dead battery. starting voltage should be in the 10.5v range and then immediately come back up when the alternator kicks in.