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Unread 02-28-2017, 10:16 AM
meurich10 meurich10 is offline
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Batter Charger Question

I read many of the batter charger posts and I didn't see this question. Maybe someone knows. I was wondering if the standard KOP chargers are acceptable to use as a trickle charger?

It is the cheap FY1205000. I have two of them but I can't find any info on them. I would do this to keep the good chargers free during a competition and I'd just use these to keep the charge.
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Unread 02-28-2017, 10:49 AM
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Re: Batter Charger Question

If you can't find something on the label or documentation that indicates that the charger switches to a "float" mode, best to assume it doesn't.

During the time span of a competition, the use of float charging is not terribly important; unless you have close to a dozen batteries, you will likely cycle each battery each day. Float chargers are essential for the off-season, particularly if you take any breaks of longer than a week or so (and most teams do). Apart from abuse or very frequent use, storing a battery in a discharged state is the easiest way to shorten battery life.

Harbor Freight has rather inexpensive float chargers ($9) if you have a tight budget.

Edit:

After skimming the manual, this definitely does not look like the right tool to maintain batteries in off season. Thanks for the heads up, Ether!
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Last edited by GeeTwo : 02-28-2017 at 11:23 AM.
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Unread 02-28-2017, 11:01 AM
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Re: Batter Charger Question

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Originally Posted by meurich10 View Post
I was wondering if the standard KOP chargers are acceptable to use as a trickle charger?
Are you sure you meant trickle charger? Or were you actually interested in a float charger?


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Unread 02-28-2017, 02:26 PM
meurich10 meurich10 is offline
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Re: Batter Charger Question

Good question I thought about using them to keep batteries charged so that is a float charger. There is no documentation on the KOP chargers so I have no idea what they do (other than 5000 mA max).

Thanks!
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Unread 02-28-2017, 02:30 PM
meurich10 meurich10 is offline
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Re: Batter Charger Question

I guess the question is can I use it to keep the batteries charged between competitions and possibly during? The risk of a cheap charger is that it doesn't go into float mode and damages the battery.

It seems like the can sense that the batter is charged. I guess I could try to monitor the current output and see if the go into some sort of low current output.
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Unread 02-28-2017, 02:36 PM
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Re: Batter Charger Question

From a quick Google search of the model number, it appears that the power adapter is sold with various connectors for different applications. Judging by that, I wouldn't imagine that it float charges.
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Unread 03-05-2017, 10:41 PM
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Re: Batter Charger Question

It sounds like you want your charger to perform different functions. KOP chargers are fine to keep batteries charged during competition and they do "float charge". However, I do not recommend that robot batteries be left connected to chargers for long periods of un-supervised time. The self discharge specifications of these batteries is in years so leaving them for several months will not harm them. Just follow common practice, no temperature extremes, no wet environments and you should be fine.
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Unread 03-07-2017, 09:23 AM
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Re: Batter Charger Question

I think I'm set. We measured the output voltage of the charger when the battery is fully charged (green light on charger) and it is within the float charging specs on the side of the battery. This should mean the charger won't damage batteries if they are left on too long. Which was really the question I should have asked.
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Unread 03-07-2017, 10:48 AM
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Re: Batter Charger Question

Quote:
Originally Posted by meurich10 View Post
We measured the output voltage of the charger when the battery is fully charged (green light on charger)
How did you make this measurement? What make and model voltmeter did you use and on what setting? Did you measure with the charger connected, or not connected, to the battery?

I ask because these kind of measurements can be tricky/deceiving.

Quote:
and it is within the float charging specs on the side of the battery
What model battery? What exactly did the specs on the side of the battery say?

Quote:
This should mean the charger won't damage batteries if they are left on too long. Which was really the question I should have asked.
No necessarily. The best way to tell for sure is to leave the battery on the charger and monitor what the voltage does over a period of a week or so.



Last edited by Ether : 03-07-2017 at 10:51 AM.
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Unread 01-08-2018, 11:45 AM
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Re: Batter Charger Question

Reply to old post - sorry but I am trying to find a supplier for this charger that you have mentioned - FY1205000.

Does anyone have a US or Canadian supplier for the version that was in the rookie KoP last couple of years? (probably not with the Anderson connector)
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Unread 01-08-2018, 12:15 PM
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Re: Batter Charger Question

Quote:
Originally Posted by KevinReid View Post
Reply to old post - sorry but I am trying to find a supplier for this charger that you have mentioned - FY1205000.

Does anyone have a US or Canadian supplier for the version that was in the rookie KoP last couple of years? (probably not with the Anderson connector)
It's available on FIRST Choice for 20 credits-max 1 per team.
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Unread 01-15-2018, 02:17 PM
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Re: Batter Charger Question

Guys,
Robot batteries are in the same general chemistry type as automotive batteries. Any current you attempt to force into a fully charged battery is converted to heat. The smart chargers with "float" functions may switch into charge mode periodically and rest at other times. If there has been no discharge path, a battery sitting on the charger may have significant surface charge which is what you are reading with the battery charger connected and ibndicating fully charged.
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Unread 01-15-2018, 03:06 PM
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Re: Batter Charger Question

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Originally Posted by Al Skierkiewicz View Post
Guys...
Hi Al. It's not clear whose post(s) you are responding to.


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Unread 01-20-2018, 09:36 AM
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Re: Batter Charger Question

In general I was responding to measuring terminal voltage with the battery connected to the charger and only looking at voltage. If you do not monitor current at the same time, you may not be seeing "float" mode on the battery charger. You may only be reading the terminal voltage of the battery when the charger is sensing the battery voltage.
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