Can everyone tell us what is the FULLY CHARGED Voltage with your stock charger of your 36V/48V/52V battery & how many miles you have on it??

[AZOldTech]

I'll start: LG cells 48V 10.4Ahr, stock 54.6V charger, FULLY CHARGED VOLTAGE = 54.2V, 134 miles

The reason I'm doing this is to see how close to full charge of 4.2V per cell, your batteries get, and if the type of cell has anything to do with it. Mine only gets to 54.2/13 = 4.17V.
Thank you.

 

[harryS]

Can you trust your voltmeter? If they are accurate to 1%, that's still 0.5Volts when checking 55 volts.

Well, assuming a very good meter, when you read something like 54.2 volts instead of the full 54.6V, it's more likely a few cell groups are sitting at 4.1 and 4.2 volts, as opposed to all of them at 4,17V. Often, those are the cell groups that power the BMS, and the battery may have sat a long time which runs them down. You would have to open your battery and walk a voltage probe down the series ladder to see if they're unbalanced,

First, try letting the battery charge a long time and see if it rebalances.

 

[SirJonathan]

From Juiced's website:

"The 52V pack when fully charged is 58.8V"

This is for the 19.2ah battery. My CCX charges fully to around 58v using the controller's voltage readout.

 

[AZOldTech]

From Juiced's website:

"The 52V pack when fully charged is 58.8V"

This is for the 19.2ah battery. My CCX charges fully to around 58v using the controller's voltage readout.

Correct. 36V batteries 10 cell, 48V 13cell, 52V 14cell. But they all should fully charge to 4.2V per cell
So you have 10x4.2=42V for 36V battery fully charged, 13x4.2=54.6V for 48V battery fully charged and 14x4.2=58.8V for 52V battery fully charged.

So to get the cell voltage you divide the fully charged output voltage with 10 (for 36V battery), with 13 (for 48V battery), and with 14 (for 52V battery).

When you say "around 58V" from your LCD display, do you mean 58.0 or 58.1 or 57.9? In any case 58V means 58/14 = 4.143V which fully charged is less than 4.2V

 

[AZOldTech]

Can you trust your voltmeter? If they are accurate to 1%, that's still 0.5Volts when checking 55 volts.

Well, assuming a very good meter, when you read something like 54.2 volts instead of the full 54.6V, it's more likely a few cell groups are sitting at 4.1 and 4.2 volts, as opposed to all of them at 4,17V. Often, those are the cell groups that power the BMS, and the battery may have sat a long time which runs them down. You would have to open your battery and walk a voltage probe down the series ladder to see if they're unbalanced,

First, try letting the battery charge a long time and see if it rebalances.

I hear you... but I've seen others quote, in different ebike boards, fully charged output voltage less than 4.2V per cell. I never seen anyone quote same as or more than 4.2V per cell. So even if it's the 1% accuracy of the voltmeter, I would expect not everyone to be below 4.2V. And that is why I asked the question.

BTW, I use a Fluke 87V multimeter with DC accuracy +/- 0.05% so accuracy isn't the problem.

 

[JRA]

My 14s3p battery of unknown cells and 1000+ miles charges @ 4A to 58.8v on my Satiator but will sag to 58.6-4v by the time I go to use it via my CA3 display. Both units of measure are fairly accurate. I do full charge cycles only.

It really doesn't matter all that much if you don't get to 4.2v per cell as long as all the cells are the same v which is why there is a balancing function during a full charge cycle via the BMS. It is a known quantity that over time and extended charge cycles that the cell v will degrade.

 

[SirJonathan]

"When you say "around 58V" from your LCD display, do you mean 58.0 or 58.1 or 57.9? In any case 58V means 58/14 = 4.143V which fully charged is less than 4.2V"

Ahh...because I can't recall the exact voltage. I've only charged it to full twice - and only the first time did I look at the voltage and recalled thinking it was around 58 which was odd because it's a 52V battery. I'll fully charge it tonight for a long ride tomorrow and note the voltage. I believe somewhere in the Juiced forum here just this week a user posted that his full charge was 57.8V according to the controller.

 

[harryS]

Check your charger too. The battery cannot go any higher than what it puts out.

 

[Feliz]

Check your charger too. The battery cannot go any higher than what it puts out.

Right, the battery can only charge to the charger voltage, I've accumulated a pile of chargers and no two are the same so for simplicity I always use the same charger which according to my meter is spot on. All my batteries are 48 volts. I don't think undercharging does any harm but overcharging is a no no.

 

[SirJonathan]

Measured today from CCX controller readout: Fully charged my 52V 19.2ah battery is 57.8 volts.

 

[KLee]

Fresh off the charger the CCX LCD display read 57.9 volts. battery is the Juiced Bike 52V 19.2 AH battery

 

[JRA]

Fresh off the charger the CCX LCD display read 57.9 volts. battery is the Juiced Bike 52V 19.2 AH battery

You should also check your voltage with a multi meter as that and the other same battery mentioned sounds low. If reading is more your display is off, if the same your charger is shorting you a volt.

Just curious....

 

[KLee]

You should also check your voltage with a multi meter as that and the other same battery mentioned sounds low. If reading is more your display is off, if the same your charger is shorting you a volt.

Just curious....

From what I’ve read in the Juiced Forum the stock charger only charges to 95%. To get a full 100% charge I would have to buy another charger.

 

[AZOldTech]

Check your charger too. The battery cannot go any higher than what it puts out.

I agree. I think it is time for me to invest on a Cycle Satiator. I've been trying to avoid that due to the price tag but I think it is time to take the plunge. Anyone has a used Satiator they want to part with?

 

[Alex M]

1% accuracy would be a terrible voltmeter.

Half-decent handheld multimeter that costs $20-30, not a high-end model like Fluke, will read 0.5% accuracy in 50V range. This is 0.3V.

Built-in panel DC meter like DROK will read at least 0.5% accuracy, often better than 0.5%. I doubt that meters in stock chargers are that accurate. Likely a cheap meter that "might" read 0.5% but often doesn't, quality control of low-cost off-brand Chinese suppliers, - you know... Check it with a reliable handheld meter a few times.

 

[JRA]

AZOT, key word being invest....the Satiator is well worth the investment.

Although Grin's price is not what standard chargers cost their investment in time and manufacturing costs in bringing the best charger available to the market and figuring in the margin of profit that helps to keep their shop afloat is just what it is. These young folks are not driving Maserati's to work, unlike a lot of young folks I have observed in Vancouver.....They ride eBikes and have done as much as they can for years to help as much as they can to provide concise, accurate information and quality products. It is a lifetime tool and will keep your batteries, no matter the chemistry, voltage, % of charge desired, fat and happy for years to come.