Re: Battery chargers

James Rauch · Post by **James Rauch** » Fri Jan 15, 2016 3:44 am

Good evening guys, I have a self designed sound board for my robot that uses a tiny 3.7v 100ma Li-Po rechargeable battery. I need to be able to charge it (or a couple of same rated batteries at the same time) with a usb wall charger. If I get a charger rated at 5v 2.1 amp or even 1 amp will I kill the battery (s) or will the battery (s) only take what it needs from the charger? Thank youJim

Jim Easley · Post by **Jim Easley** » Fri Jan 15, 2016 4:38 am

I think Li-Po or any lithium battery requires a specific charging circuit so, no a USB wall charger by itself should not be used. You will need additional circuitry or a charger designed to for the battery. Lithium batteries have been known to catch fire and even blow up during either high discharge rates or while charging. From: B9Builders@yahoogroups.com Sent: Friday, January 15, 2016 12:44 AM To: B9Builders@yahoogroups.com Subject: [B9Builders] Battery chargers
Good evening guys, I have a self designed sound board for my robot that uses a tiny 3.7v 100ma Li-Po rechargeable battery. I need to be able to charge it (or a couple of same rated batteries at the same time) with a usb wall charger. If I get a charger rated at 5v 2.1 amp or even 1 amp will I kill the battery (s) or will the battery (s) only take what it needs from the charger? Thank you Jim

Sky Rocket Guy · Post by **Sky Rocket Guy** » Fri Jan 15, 2016 7:59 am

You will damage the batteries from overcharging them.
Jeff Lake

From: "'James rauch' faqall@sssnet.com [B9Builders]"
To: B9Builders@yahoogroups.com
Sent: Friday, January 15, 2016 3:44 AM
Subject: [B9Builders] Battery chargers

Good evening guys, I have a self designed sound board for my robot that uses a tiny 3.7v 100ma Li-Po rechargeable battery. I need to be able to charge it (or a couple of same rated batteries at the same time) with a usb wall charger. If I get a charger rated at 5v 2.1 amp or even 1 amp will I kill the battery (s) or will the battery (s) only take what it needs from the charger? 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Bob Darlington · Post by **Bob Darlington** » Fri Jan 15, 2016 11:42 am

Use something like this: https://www.sparkfun.com/products/10217
-Bob

On Fri, Jan 15, 2016 at 1:44 AM, 'James rauch' faqall@sssnet.com [B9Builders] wrote:

Good evening guys, I have a self designed sound board for my robot that uses a tiny 3.7v 100ma Li-Po rechargeable battery. I need to be able to charge it (or a couple of same rated batteries at the same time) with a usb wall charger. If I get a charger rated at 5v 2.1 amp or even 1 amp will I kill the battery (s) or will the battery (s) only take what it needs from the charger? Thank youJim

James Rauch · Post by **James Rauch** » Fri Jan 15, 2016 11:49 am

Thank you Bob, and everyone else who responded. I am glad I asked before I plugged anything in. Jim From: B9Builders@yahoogroups.com [mailto:B9Builders@yahoogroups.com]
Sent: Friday, January 15, 2016 11:42 AM
To: B9 Robots Builders Club
Subject: Re: [B9Builders] Battery chargers Use something like this: https://www.sparkfun.com/products/10217 -Bob On Fri, Jan 15, 2016 at 1:44 AM, 'James rauch' faqall@sssnet.com [B9Builders] wrote: Good evening guys, I have a self designed sound board for my robot that uses a tiny 3.7v 100ma Li-Po rechargeable battery. I need to be able to charge it (or a couple of same rated batteries at the same time) with a usb wall charger. If I get a charger rated at 5v 2.1 amp or even 1 amp will I kill the battery (s) or will the battery (s) only take what it needs from the charger? Thank youJim

basilgrant327 · Post by **basilgrant327** » Fri Jan 15, 2016 4:04 pm

Attachments : Any Lithium based batteries which are (no pun intended) potentially overcharged have the capability to rupture and start a fire, the latest teen toy craze here in Australia has been those "hoverboards" and heaps of them have started dangerous fires from poorly matched or designed power systems (battery and chargers), and although many of the members may have already used Lithium batteries, I would think twice about it...Interesting topic, probably "spark" some more comments

[img]cid:AOLP.828273[/img] Basil Grant -----Original Message-----
From: Sky Rocket Guy skyrocketguy@yahoo.com [B9Builders]
To: B9Builders
Sent: Fri, Jan 15, 2016 11:59 pm
Subject: Re: [B9Builders] Battery chargers

You will damage the batteries from overcharging them.
Jeff Lake

From: "'James rauch' faqall@sssnet.com [B9Builders]"
To: B9Buil ders@yahoogroups.com
Sent: Friday, January 15, 2016 3:44 AM
Subject: [B9Builders] Battery chargers

Good evening guys, I have a self designed sound board for my robot that uses a tiny 3.7v 100ma Li-Po rechargeable battery. I need to be able to charge it (or a couple of same rated batteries at the same time) with a usb wall charger. If I get a charger rated at 5v 2.1 amp or even 1 amp will I kill the battery (s) or will the battery (s) only take what it needs from the charger? Thank you Jim

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James Rauch · Post by **James Rauch** » Sat Jan 16, 2016 3:26 am

Attachments :Interesting, I didn t know lithium s did that, thanks for the warning.Jim From: B9Builders@yahoogroups.com [mailto:B9Builders@yahoogroups.com]
Sent: Friday, January 15, 2016 4:05 PM
To: B9Builders@yahoogroups.com
Subject: Re: [B9Builders] Battery chargers Any Lithium based batteries which are (no pun intended) potentially overcharged have the capability to rupture and start a fire,the latest teen toy craze here in Australia has been those "hoverboards" and heaps of them have started dangerous fires from poorly matched or designed power systems (battery and chargers), and although many of the members may have already usedLithium batteries, I would think twice about it...Interesting topic, probably "spark" some more comments

[img]cid:image002.png@01D1500D.A31D2C10[/img]Basil Grant -----Original Message-----
From: Sky Rocket Guy skyrocketguy@yahoo.com [B9Builders]
To: B9Builders
Sent: Fri, Jan 15, 2016 11:59 pm
Subject: Re: [B9Builders] Battery chargers You will damage the batteries from overcharging them. Jeff Lake From: "'James rauch' faqall@sssnet.com [B9Builders]"
To: B9Buil ders@yahoogroups.com
Sent: Friday, January 15, 2016 3:44 AM
Subject: [B9Builders] Battery chargers Good evening guys, I have a self designed sound board for my robot that uses a tiny 3.7v 100ma Li-Po rechargeable battery. I need to be able to charge it (or a couple of same rated batteries at the same time) with a usb wall charger. If I get a charger rated at 5v 2.1 amp or even 1 amp will I kill the battery (s) or will the battery (s) only take what it needs from the charger? Thank youJim

James Rauch · Post by **James Rauch** » Sat Jan 16, 2016 3:30 am

Attachments :A friend gave me half a dozen of these, said they were from some broken mini radio control quad copters. They should be ok, right? From: B9Builders@yahoogroups.com [mailto:B9Builders@yahoogroups.com]
Sent: Saturday, January 16, 2016 3:26 AM
To: B9Builders@yahoogroups.com
Subject: RE: [B9Builders] Battery chargers Interesting, I didn t know lithium s did that, thanks for the warning.Jim From: B9Builders@yahoogroups.com [B9Builders@yahoogroups.com]
Sent: Friday, January 15, 2016 4:05 PM
To: B9Builders@yahoogroups.com
Subject: Re: [B9Builders] Battery chargers Any Lithium based batteries which are (no pun intended) potentially overcharged have the capability to rupture and start a fire,the latest teen toy craze here in Australia has been those "hoverboards" and heaps of them have started dangerous fires from poorly matched or designed power systems (battery and chargers), and although many of the members may have already usedLithium batteries, I would think twice about it...Interesting topic, probably "spark" some more comments

[img]cid:image001.png@01D1500E.3592EA80[/img]Basil Grant  -----Original Message-----
From: Sky Rocket Guy skyrocketguy@yahoo.com [B9Builders]
To: B9Builders
Sent: Fri, Jan 15, 2016 11:59 pm
Subject: Re: [B9Builders] Battery chargers You will damage the batteries from overcharging them. Jeff Lake   From: "'James rauch' faqall@sssnet.com [B9Builders]"
To: B9Buil ders@yahoogroups.com
Sent: Friday, January 15, 2016 3:44 AM
Subject: [B9Builders] Battery chargers   Good evening guys,          I have a self designed sound board for my robot that uses a tiny 3.7v 100ma Li-Po rechargeable battery. I need to be able to charge it (or a couple of same rated batteries at the same time) with a usb wall charger. If I get a charger rated at 5v 2.1 amp or even 1 amp will I kill the battery (s) or will the battery (s) only take what it needs from the charger? Thank youJim

Jim Easley · Post by **Jim Easley** » Sat Jan 16, 2016 4:03 am

Attachments : Jim, As long as you use the appropriate charger and the cell is not damaged. It is fine. Keep in mind almost every cell phone, electronic gadget and cordless power tool you buy these days are lithium. Many lithium batteries have built in electronics that prevent accidental shorting or complete discharge. IMHO the biggest problem with lithium cells is if you allow them to discharge below a set voltage (I think around 1.7 volts) they will not re-charge unless you use a specialty charging circuit. You can buy these (expensive) types of chargers at hobby shops that sell RC cars and/or planes... From: B9Builders@yahoogroups.com Sent: Saturday, January 16, 2016 12:30 AM To: B9Builders@yahoogroups.com Subject: RE: [B9Builders] Battery chargers
A friend gave me half a dozen of these, said they were from some broken mini radio control quad copters. They should be ok, right? From: B9Builders@yahoogroups.com [mailto:B9Builders@yahoogroups.com]
Sent: Saturday, January 16, 2016 3:26 AM
To: B9Builders@yahoogroups.com
Subject: RE: [B9Builders] Battery chargers Interesting, I didn t know lithium s did that, thanks for the warning. Jim From: B9Builders@yahoogroups.com [B9Builders@yahoogroups.com]
Sent: Friday, January 15, 2016 4:05 PM
To: B9Builders@yahoogroups.com
Subject: Re: [B9Builders] Battery chargers Any Lithium based batteries which are (no pun intended) potentially overcharged have the capability to rupture and start a fire, the latest teen toy craze here in Australia has been those "hoverboards" and heaps of them have started dangerous fires from poorly matched or designed power systems (battery and chargers), and although many of the members may have already used Lithium batteries, I would think twice about it...Interesting topic, probably "spark" some more comments

[img]cid:0E7F74E16CEB4AE383D0AEEE4615DCDF@JimsPC[/img] Basil Grant -----Original Message-----
From: Sky Rocket Guy skyrocketguy@yahoo.com [B9Builders]
To: B9Builders
Sent: Fri, Jan 15, 2016 11:59 pm
Subject: Re: [B9Builders] Battery chargers You will damage the batteries from overcharging them. Jeff Lake From: "'James rauch' faqall@sssnet.com [B9Builders]"
To: B9Buil ders@yahoogroups.com
Sent: Friday, January 15, 2016 3:44 AM
Subject: [B9Builders] Battery chargers Good evening guys, I have a self designed sound board for my robot that uses a tiny 3.7v 100ma Li-Po rechargeable battery. I need to be able to charge it (or a couple of same rated batteries at the same time) with a usb wall charger. If I get a charger rated at 5v 2.1 amp or even 1 amp will I kill the battery (s) or will the battery (s) only take what it needs from the charger? Thank you Jim

Gregorio Padin · Post by **Gregorio Padin** » Sat Jan 16, 2016 4:30 pm

From what I have read in the past, the charger needs to be designed for the battery you are using, it has to do with the temperature of the battrey while charging. As the amperage goes, I do not think more would be bad, just makes ut charge fastet (I am almost certain).
If the usb charger is dor lipo or one made for two like lipo and cad then you should be fine. If it is a slow charger line feom a laptop you might want to check more to see if it would work
Hooe this hells a bit.

On Fri, Jan 15, 2016 at 5:38 AM, 'Jim Easley' jimeasley.tech@gmail.com [B9Builders] wrote:
I think Li-Po or any lithium battery requires a specific charging circuit so, no a USB wall charger by itself should not be used. You will need additional circuitry or a charger designed to for the battery. Lithium batteries have been known to catch fire and even blow up during either high discharge rates or while charging. From: mailto:B9Builders@yahoogroups.com Sent: Friday, January 15, 2016 12:44 AM To: B9Builders@yahoogroups.com Subject: [B9Builders] Battery chargers
Good evening guys, I have a self designed sound board for my robot that uses a tiny 3.7v 100ma Li-Po rechargeable battery. I need to be able to charge it (or a couple of same rated batteries at the same time) with a usb wall charger. If I get a charger rated at 5v 2.1 amp or even 1 amp will I kill the battery (s) or will the battery (s) only take what it needs from the charger? Thank you Jim

Wilsons Sandbox