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 Post subject: Ryobi charger
PostPosted: Sun Oct 30, 2011 10:46 am 
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Joined: Tue Mar 17, 2009 5:06 pm
Posts: 319
Location: Minneapolis, MN
I picked up a 9.6v Ryobi at a garage sale to leave at the shop. But it didn't have a charger. Anyone got one laying around. Was planning on getting 2 new batteries, and a charger. But if anyone has one they are not using...

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 Post subject: Re: Ryobi charger
PostPosted: Mon Nov 07, 2011 12:07 pm 
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Joined: Thu Feb 17, 2011 9:46 pm
Posts: 42
Thanks for scaring up a drill! That's something I've really missed when piecing things together from wood.

I presume these are NiCad battery packs? If so, then the official charger is probably not very "smart", and simply charges at a controlled current. This is the kind where you are supposed to remember to remove the battery after "about 8 hours" for best results.

If so, we could easily do much better with a timer-controlled arduino-based charger. I'm picturing a small LCD readout of how long the battery has been charging and how long it will continue to charge. After any battery has been in the charger for about 8 hours, it cuts off (or down) the charge current. Otherwise I'm sure the batteries on the charger will be left there for days and weeks on end due to the realities of a group work environment.

The main thing to be researched would be what an appropriate voltage and current is to safely charge the packs, and for how long.

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 Post subject: Re: Ryobi charger
PostPosted: Mon Nov 07, 2011 4:25 pm 
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Please let me know if you find a good reference for these volt/amp specs for the myriad of chemistries.

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 Post subject: Re: Ryobi charger
PostPosted: Wed Nov 09, 2011 3:25 am 
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Joined: Thu Feb 17, 2011 9:46 pm
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http://batteryuniversity.com/learn/arti ... t_chargers

http://batteryuniversity.com/learn/arti ... the_c_rate

http://batteryuniversity.com/learn/arti ... _batteries

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kstoerz.com


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 Post subject: Re: Ryobi charger
PostPosted: Wed Nov 09, 2011 10:28 am 
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Joined: Tue Mar 17, 2009 5:06 pm
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Location: Minneapolis, MN
Love the idea of a home brewed charger (even better if we can charge 9.6, 14.4, and 18V all with the flick of a switch)
What do we need to make it happen?

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