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Old 12-07-2011, 04:23 PM   #1
metalmagpie
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Default Dewalt 18V batteries - NiMH?

My last NiCAD DC9096 DeWalt battery is on its last legs. I'm considering upgrading my charger and buying their DC9180 Li-Ion batteries. But my buddy who knows everything says nearly all modern cordless drills use nickel metal hydride batteries (NiMH) and I see that aftermarket guys sell those for the DeWalt 18V tools although DeWalt itself does not appear to.

Which way is a better way to go? I hear that in cold weather the Li-Ion batteries not only don't work, but that they can be destroyed. So don't leave them in a truck in winter!

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Old 12-07-2011, 05:13 PM   #2
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Default Re: Dewalt 18V batteries - NiMH?

I have not had an issue with Li-ion getting froze I work outside year round.
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Old 12-07-2011, 07:21 PM   #3
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Default Re: Dewalt 18V batteries - NiMH?

I have Makita Li and Ridgid Li...they're absolute junk. Won't charge wgen they're too hot, won't charge when they're too cold. Work fine one day and then they're completely shot the next. I have had my Ridgid 18V Li stuff for about 2 years now, Ridgid has replaced the batteries about 3 times and the charger once. Last trip to the service center, they gave me 2 new batteries and a charger. Both batteries failed within 3 weeks. IMHO the Li technology is not quite ready for prime time.
I have not seen NiMH batteries being offered for cordless tools...please advise.
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Old 12-07-2011, 08:18 PM   #4
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Default Re: Dewalt 18V batteries - NiMH?

dewalt only has nicad or li-ion. of the two the li-ion kicks butt. I have had the li-ion for a couple of years now and they still hold their charge, granted it never gets cold here.

The best thing about the li-ion is that it doesn't self discharge as fast as nicads. I use my tools infrequently, and with nicads after about 2 months the're complely discharged and need to be charged before use. with the li-ion they are always ready to go, no need to charge first.
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Old 12-07-2011, 08:46 PM   #5
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Default Re: Dewalt 18V batteries - NiMH?

Quote:
Originally Posted by tcianci View Post
I have not seen NiMH batteries being offered for cordless tools...please advise.
Advise you google on 'makita nimh' tons of hits
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Old 12-07-2011, 09:35 PM   #6
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Default Re: Dewalt 18V batteries - NiMH?

Have you tried the "rejuvenate the nicad" ideas all over the internet..

Read this first
Dendritic shorting in NICAD batteries
When not used regularly, dendrites tend to develop. Dendrites are thin, conductive crystals that may penetrate the separator membrane between electrodes. This leads to internal short circuits and premature failure, long before the 800–1000 charge/discharge cycle life claimed by most vendors. Sometimes, applying a brief, high-current charging pulse to individual cells can clear these dendrites, but they will typically reform within a few days or even hours. Cells in this state have reached the end of their useful life and should be replaced. Many battery guides, circulating on the Internet and online auctions, promise to restore dead cells using the above principle, but achieve very short-term results at best.



I have tried it on 4..3 came back and work ok in devices requiring low current draws (like flashlights)..not quite the same life, but waaaay more than when i started with them...at first the 4 18V dewalt nicads showed the "replace battery pack" fast flash with less than a volt on each..
3 came back to 21volts

got a voltmeter? wanna try it give it a whirl....

NOT this link...he's selling the procedure below.
http://rejuvenator.prnc.net/

this youtube video with details adnauseum for ones unfamiliar with the process..
http://www.youtube.com/watch?v=qQYdi48N81U

Last edited by waltinbatonrouge; 12-07-2011 at 09:54 PM.
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Old 12-07-2011, 09:50 PM   #7
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Default Re: Dewalt 18V batteries - NiMH?

Dewalt Li-ion batteries are good for batteries that may sit for a while between uses. They run strong and die hard usually without warning which can leave you climbing back down a ladder un-necessarily. NiCad batteries give the audible change to help warn you that the charge is low. I have a mix of the two. The nicads self discharge over time and are also affected by the cold and extreme heat. Also, the li-ion's are really expensive. 2 Nicad's are around $100 for 2. Dewalt had an issue with early Li-Ion batts and I had two that were warrantied after about a year. The replacement Li-Ion's are much better.

Last edited by gatchel; 12-07-2011 at 09:54 PM.
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Old 12-08-2011, 09:35 AM   #8
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Default Re: Dewalt 18V batteries - NiMH?

I have the dewalt LI=ON and like them very much

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Old 12-08-2011, 10:07 AM   #9
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Default Re: Dewalt 18V batteries - NiMH?

brief summary:

Ni-Cad : 'old-school', heavy, relatively durable, may have 'Ni-Cad memory effect' on partial discharge-recharge, self-discharges

NiMH : newer than Ni-Cad, a bit better power possible than Ni-Cad, no 'memory effect', still heavy, self-discharges (but not as fast as Ni-Cad)

Li-ion : newest of the three battery technologies, relatively light-weight, can have good power possible, requires 'fancy' chargers (most 'new' chargers can do them no problem), if 'abused' (too hot, too cold, over-charged, short-circuited or over-current draw, etc) can fail very badly (vent fire and flame), most 'new' Li-packs have built-in 'protection circuits' that are often responsible for the sudden-OFF behaviour (pack/device works and then just stops with no warning, unlike Ni-Cad or Ni-MH which 'slow down' as they are almost 'empty'), (usually) very little self-discharge

There is no 'one-size-fits-all' battery solution. Pick what works for you.

YMMV.
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Old 12-08-2011, 10:35 AM   #10
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Default Re: Dewalt 18V batteries - NiMH?

I'm needing to replace my two Li-on packs for my Craftsman C3 equipment. I've beat the hell out of them for about 3 years, so I guess I got my $$ worth. $90 a pop and I can buy the drill for $40 LOL. They last WAY longer than the NiCads and put out more power IMHO.
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Old 12-08-2011, 10:37 AM   #11
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Default Re: Dewalt 18V batteries - NiMH?

"rejuvenate the nicad" - - I did this to two 18v dewalt batteries. Purchased the drill/saw kit from CL and was told batteries were bad. Sure enough, wouldn't even charge. Last time I used the drill with drill bit I was able to install two garage doors and the battery was still running strong. I'm sure results would vary based on pre-juvinate battery conditions.
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Old 12-08-2011, 12:13 PM   #12
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Default Re: Dewalt 18V batteries - NiMH?

the local Interstate Battery in Corpus here has a service for about 50 bux they'll rebuild the Dewald 18V XRP's with new, higher power, more storage (mAh)...

I have a Li-ON battery in my Dewalt 18V XRP stuff and LOVE IT...its the only reason why I havnt gotten my three old dead batteries rebuild...it re-charges FAST and makes the drill feel stonger than when it was new...however there is no warning as to when you'll be out of juice..it'll run at 100% then just DIE...
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