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Unread 08-13-2019, 10:10 AM   #31
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Default Re: Allied Lithium drop in batteries

I wonder if what you are measuring is the voltage drop across the inline BMS circuit inside the batteries when under load.

Since the usable voltage range of the lithium cell is very narrow, the meter may be having problems trying to represent what is sensing.
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Unread 08-13-2019, 02:04 PM   #32
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Default Re: Allied Lithium drop in batteries

Any input to be gathered from the Lester Summit dashboard? I am just not well versed in this area. Cart runs fine and seems to do exactly what I need it to do so far.
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Unread 08-13-2019, 03:13 PM   #33
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Default Re: Allied Lithium drop in batteries

Quote:
Originally Posted by BBBHC View Post
I'm interested to see what you folks find once you try new meters.

It's my understanding that one of the benefits of lithium over FLA batteries, is they do not sag near as much as FLAs. In addition, they recover from sagging much quicker than FLAs.
Quote:
Originally Posted by Volt_Ampere View Post
I doubt that changing meters will have any influence on the voltage variation you are seeing. Meters do not tend to drift like that.
I am on the same page with y'all.....
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Unread 08-15-2019, 11:08 PM   #34
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Default Re: Allied Lithium drop in batteries

Quote:
Originally Posted by Gregt909 View Post
Here’s a picture of the brand. Lithium Charger is sold separately but they claim you can use your existing charger.
THAT is the proverbial 'NO BUENO' line.
You DEFINITELY do not want to use your lead-acid charger on pricey lithium batteries.
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Unread 08-17-2019, 02:56 PM   #35
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Default Re: Allied Lithium drop in batteries

Quote:
Originally Posted by trevinom View Post
THAT is the proverbial 'NO BUENO' line.
You DEFINITELY do not want to use your lead-acid charger on pricey lithium batteries.
Can you please tell me why? As far as i understand the built in BMS takes care of charging?

What is your concern?
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Unread 08-17-2019, 03:10 PM   #36
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Default Re: Allied Lithium drop in batteries

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Originally Posted by relcead View Post
Can you please tell me why? As far as i understand the built in BMS takes care of charging?



What is your concern?
Battery University is a great resource to educate yourself on just about anything dealing with batteries.

https://batteryuniversity.com/learn/..._ion_batteries

https://batteryuniversity.com/learn/

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Unread 08-17-2019, 03:37 PM   #37
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Default Re: Allied Lithium drop in batteries

Quote:
Originally Posted by MCJEFE View Post
Battery University is a great resource to educate yourself on just about anything dealing with batteries.

https://batteryuniversity.com/learn/..._ion_batteries

https://batteryuniversity.com/learn/

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yeah thanks. li ion is no lifepo4

do you know the answer? i am educated in bat tech. that is why i am asking.

Last updated 2018-04-24 lol
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Unread 08-19-2019, 03:12 PM   #38
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Default Re: Allied Lithium drop in batteries

Quote:
Originally Posted by relcead View Post
Can you please tell me why? As far as i understand the built in BMS takes care of charging?



What is your concern?


I have to apologize for this post. I got updated by email about this thread and when i opened it , it was sitting on the post where it said the seller was selling you batteries and that you’d be able to use use your existing charger. I assumed i was at the end of the topic but was obviously mistaken.
I agree, if you are hooking the charger to a bms, you should be OK. The BMS should take care of doling out the correct voltage/amperage.


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Unread 08-19-2019, 03:22 PM   #39
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Default Re: Allied Lithium drop in batteries

I have yet to see a BMS that would control a charger designed for FLA batteries. Yes it will shut off the charge if the cells get too high in voltage but the charger should do a contant current / contant voltage charge profile designed for the Lithium chemistry that you are using. Do NOT rely on the BMS to turn off the charge. It is a backup in case the charger fails to shut off properly or if your battery is way out of balance and some cells start to overcharge.
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Unread 08-19-2019, 09:24 PM   #40
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Default Re: Allied Lithium drop in batteries

Ok thank you. How does this work with laptops and mobiles when the cycles are interrupted and different Amp. chargers like USB, wireless charge and wall plug are applied. I agree that the best thing for 48V Lifepo4 set is a charger with CC/CV and the right charge voltage to allow the BMS to balance the cells with low current in the end. If the charger is not matching - the efficency of charging and the lifecycle of the pac may be limited. The BMS has to work hard for no reason and will waste energy from my understanding. Allied Lithium is claiming their pacs can be charged with regular chargers.

Quote:
An existing Lead Acid charger can be used for Allied Batteries, however our lithium charger is suggested. The Lithium Charger is more energy efficient and also comes with the OEM cart plug.
My question would be how big is the difference in the end. I will measure the input output my setup from an other supplier with both charger types an a PC charging setup.
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