charging

Energy One

Deathstar88

Active Member
i have the tomokio 450 ccs battery. I charge the battery on a tender before i ride. I ride all day.... towards the end of the day, battery seems week, and not as strong as it was at the beginging of the day,. ( harder to turn engine over) as the day goes by. then when i get home...i throw the bike back on the tender.....and it takes a few hours to recharge the battery again. my point is, it seems like the battery is draining itself from riding all day, and not keeping full charge. any ideas? or is that normal?
 
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Brew

Troop Supporter
Start the scoot and put a meter on the positive and negative posts while it's running. Should have near 14.0 volts DC registering on the volt meter. if it well below then you know your charging system is fouling up. I would suggest you check the regulator and stator after that.

Also you wont get much charging going on if, you're just doing bar hops or short jots ... :D
 

Deathstar88

Active Member
no, i never checked anything. the bike has not left me stranded. but i just feel that the battery is getting weaker
 

TapioK

Well-Known Member
no, i never checked anything. the bike has not left me stranded. but i just feel that the battery is getting weaker
Well, maybe it is time to check.
Never heard of that battery, sounds strange and 450 cca! that is huge number, is it a lithium battery?
If the battery is good, and if it takes full charge from the "wall charger" and voltage doesn't drop too much when starting the engine, there is something wrong with bikes charging system. Just follow the instructions on the link.
 

TapioK

Well-Known Member
Now I got it, Tomioka, OK, putting letters randomly confused me for a while! :lol: with that kind of cca I would expect the engine going over like crazy!
 

Brew

Troop Supporter
Put a meter on it with it running and see what kind of volts the charging system is sending to your battery. If the volts going to the battery are good, you might just have a bum battery!
 

Deathstar88

Active Member
ok....i put a meter on the battery. i started the bike. At idle.....i got a reading of between 12 and 13. when i reved the engine...the meter would jump to 14, and a little above.
 

TapioK

Well-Known Member
That 14+ sounds good and normal. Now you want to know if it stays like that when Voltage Regulator gets hot. can you rig the multimeter to be used while actually riding to see whether the numbers stay like that. If they do, it looks like there is something wrong with the battery.
Lazy might try to heat the regulator with hair dryer while engine is running to simulate actual riding.
 

Sven

Well-Known Member
H/L off may be higher. If this is a digital meter, read volts as 12.8 or 13.1. We have no clue what 'between 12 and 13' is? See how 12.9v could be in the middle of those 2 numbers?

If H/L on, this might draw the battery voltage down below 14.1v as an example voltage for a good idle number.

Say a battery that comes with its own pack of acid for you to pour in, there is a certain way to charge a new battery if one reads the directions. If someone at a bike shop charged the battery for you, my guess is it was not charged per instructions. That says it's going to have a short life.

As suggested, you want to somehow clip that volt meter on the battery, tap the meter to the handlebars and watch the way the bike handles charging that battery. Brake light draws a lot of current and if that brings the volts down quick say, it may point to the battery.

Say at 12.6v nothing is drawing current off the battery.
Say with key on, you hold the brake light on, note how fast the current drops from the 12.6v number. If it drops to 12.4/12.1v within a few minutes or less, that's one test. If you turn the key off, wait 10 minutes, what did the battery do as far as 'recovery?' We should be back up to 12.6v meaning.

If it hangs down at 12.1/12.3v, Huston, we have a problem.
 

Sven

Well-Known Member
i have constant running lights. there is no way to turn them off. so thats what it is
V/reg recognizes demand out of the battery, right? Say we have 3 variables to eliminate.

Stator = What is my output at max rpm? The faster I rotate, the more I upset things as in cause heat, which move molecules, meaning, that makes more voltage out the wires. What is that chart against your wires?

V/reg = I regulate what the stator puts out in excess. I'm in the middle of this. I see your headlight on at idle, that is more current out the battery the stator needs to come up with. I am constantly regulating 14v into that battery as we putt down the road. At idle with key on, front and rear lights on, I now have to kick in more than is being used out of the battery. If I am regulating, I should be showing more volts, especially if I am a computer bike that needs a constant 5v for that system.

Battery = I am a storage unit. I am feeding lights/ign/black box telemetry. If I am at 12v, do you see how I could be 4.99v from being 5v if that battery drops anymore? That is why I have to be well charged on the surface at 12.8v. If I am down to 12.1 from a well charged battery, meaning, 12.8 is now 12.1 in a day or so after a charge and it sits for days, then it's a battery that cannot hold even a surface charge.

1. Where are we in stator output? We want to see if the battery is the problem.

2. The V/reg shows it can move and control voltage when revved. So without some other bike checking it's charge and sending in a post as to what their bike idles at, it might be normal if it cuts off at 14 said volts. So no, it's not the V/reg at this time, nor say the stator. Why? Because the V/reg can cut off and sustain that 14v window, right?

3. We are down to the battery as the whole loop are these 3 components. Back to what someone said about a load test. Surface test, walk away from the battery after it's been charged. Write down the digital number, then test down the road, or help it with a bulb on for 3 minutes and no more.
 
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