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Tool Talk Discussion Forum

outlet timer

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fixerupper

01-15-2008 05:13:12

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I have a bad habit of leaving cordless tool batteries plugged in way too long, like for days at a time. The result is shortend battery life $$$$$$$.

The charger I use the most is permanently located in the wood shop and never moves. Yesterday I got busy and installed a timer on the plugin by the charger, so now when a battery is thrown on the charger I can give the timer a twist and forget about it because it'll shut itself off.

Now I have one question. After the power is cut to the charger, will it suck juice back out of the battery if the battery is left in the charger? Just wondering. Jim

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circus

01-15-2008 07:18:25

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let us know in reply to fixerupper, 01-15-2008 05:13:12

You would think the diodes that turn the AC into DC would prevent battery drain when unpluged. If they did drain, it would take weeks. I'm not sure so give it a try and let us know.

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IH2444

01-15-2008 10:57:23

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Re: let us know in reply to circus, 01-15-2008 07:18:25

I suspect that idf there is an led in the charging circuit it might be on the tool side of the diode and causes drain. Yep the diode should block the drain, something else must be in the circuit.

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oldfarmtractor

01-15-2008 05:28:19

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Re: outlet timer in reply to fixerupper, 01-15-2008 05:13:12

So why not add a timer or should I say automatic switch that turns on for a couple hours each day?

I have one on my tools. I give them about 30 minutes each day around 2:00 in the AM but on a day the batteries need a good charge, I flip the switch on and it keeps charging until the shut off time, around 2:30 AM.

You can get them pretty cheap at the dollar store, I hit IKEA for them and fluorescent screw in bulbs.

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fixerupper

01-15-2008 05:43:23

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Re: outlet timer in reply to oldfarmtractor, 01-15-2008 05:28:19

Good idea! I never thought about giving them a little charge every night. That means a fresh battery will always be ready.

This brings another question, and maybe I'm being too picky here,but isn't a battery only good for a certain amount of charges? Then it's life is over. Maybe I'm just imagining this.

I know that the treatment I've been giving them by overcharging has been killing them faster than any other kind of abuse. Jim

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big jt

01-15-2008 08:31:33

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Re: outlet timer in reply to fixerupper, 01-15-2008 05:43:23

Jim

I always thought that NiCads didn't react well to topping off charges. Set the "memory" so there was no "depth".

I know you have a lot of NiMh and those may work with this set up.

I went from Makita to Dewalt earlier last year and Dewalt chargers have a "tune up" feature which seems to tolerate the neglect like you are talking about (I tend to forget them in the charger also).

I wonder if a little time spent with a Volt/Ohm meter would tell you if there is a leak in the charger when off. Another possibility would be to call the Manufacturer and ask.

Stay warm sounds like we're going to get cold this week.

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Bob

01-15-2008 05:21:40

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Re: outlet timer in reply to fixerupper, 01-15-2008 05:13:12

I have a Black and Decker drill (about 8 years old), and the batteries WILL discharge over DAYS if left in the charger, and the charger gets unplugged. (The batteries ARE good, and will hold a charge sitting on the bench, out of the charger.)

That's NOT to say ALL chargers are like that, but the one I have certainly is.

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