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Forum topic by Kenny Dunn posted 12-21-2012 12:44 AM 1143 views 0 times favorited 8 replies Add to Favorites Watch
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Kenny Dunn

44 posts in 1786 days


12-21-2012 12:44 AM

I am one not to leave well enough alone, so even though my batteries were working fine I starting thinking about what happens upon their death. I acquired a dead 18v Milwaukee NiCad pack and going to tinker. My charger will handle the new Li Ion Milwaukee batteries so I was thinking about getting a pack from an RC place and see what happens. Not in yet (shipping from HK) but wanted to hear who else did what. If anyone is interested Hobbyking.com has tons of these things in Lipo in all kinds of configurations and capacities. The voltages for Lipo are the same as Li Ion so they should in theory work. These RC guys are really serious about their battery packs. The downside may be that LiPo doesn’t last that long, maybe 3 years tops. I will be reporting back as to what I find and want to hear what others have done.

-- I saw an angel in the marble and I carved until I set him free-Michelangelo


8 replies so far

View Loren's profile

Loren

8295 posts in 3108 days


#1 posted 12-21-2012 01:35 AM

All I know about rebuilding Li-on batteries is it requires special
equipment for safety. The reason they shut down is because
they have some sort of failsafe device in them that incapacitates
the battery if the charger detects wrong battery behavior.
They have been known to explode.

I’d read up on it real good.

I have researched rebuilding Ni-Cads and Ni-mh batteries
quite a bit and when you look at what you can buy the
cells for, it makes sense to send the batteries to somebody
who does it every day and has the electronic soldering
equipment to do it really well. The battery rebuilt by
a pro with pro equipment is likely to outlast a home
rebuild.

In terms of Li-po batteries, that’s a new one I haven’t
heard about.

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a1Jim

115201 posts in 3037 days


#2 posted 12-21-2012 01:44 AM

interesting.

-- http://artisticwoodstudio.com Custom furniture

View Kenny Dunn's profile

Kenny Dunn

44 posts in 1786 days


#3 posted 12-21-2012 02:27 AM

The packs are already prebuilt, nothing really to do but wire up the positive and negative wires, all the bars are already there and the packs are in a nice shrink wrapped package. Very light, high capacity, and cheap. If my setup will work I will have $25 (plus shipping) in a Li Ion pack that would cost $100+ from Milwaukee. Also Lipo acts just like regular Li Ion as far as charging, around 4.2 volts max, normal around 3.6. keep it above 3 and you are good.

-- I saw an angel in the marble and I carved until I set him free-Michelangelo

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Planeman40

805 posts in 2221 days


#4 posted 12-21-2012 06:31 AM

Be aware that there are a number of L-ion battery rebuild services available. Just Google “L-ion Battery Rebuild”

Planeman

-- Always remember: It is a mathematical certainty that half the people in this country are below average in intelligence!

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patcollins

1420 posts in 2325 days


#5 posted 12-21-2012 02:43 PM

Be careful, the RC guys also charge them in fire proof sacks.

Once they blow there is no stoping the fire short of covering it in sand or droping it in a bucket of water.

http://www.youtube.com/watch?v=ixIOEPnsgbI

View Kenny Dunn's profile

Kenny Dunn

44 posts in 1786 days


#6 posted 12-21-2012 10:34 PM

Oh I know they can catch fire, but hey, put enough voltage to anything and watch out!

-- I saw an angel in the marble and I carved until I set him free-Michelangelo

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Kenny Dunn

44 posts in 1786 days


#7 posted 01-09-2013 02:47 AM

If anyone is still following this thread, I have good news to report. It took about a month to get the pack from China, and a couple of more days to remember where I left the dead pack, but I am happy to say I got it soldered in there and it works great! Not put it through its paces yet, but just put it in my 18 volt Milwaukee 1/4 inch impact and it sounded much faster than the 18 nicad. Fingers crossed when I try and charge it, will post a follow up after a while. I have about $30 and 10 minutes in what would cost over $100 from factory.

-- I saw an angel in the marble and I carved until I set him free-Michelangelo

View Kenny Dunn's profile

Kenny Dunn

44 posts in 1786 days


#8 posted 01-09-2013 11:26 PM

Charging didn’t go so well. I have a universal charger that is suppose to detect what type of battery from the voltage and charge accordingly, but it over charged and fried the battery. I monitored the charging checking the voltage of the battery from time to time and it was doing fine, then at the end the charger topped the voltage to 22 when it should have been around 20.5 frying the battery. I don’t know how the charger determined this voltage as it doesn’t make sense as none of the packs should charge to that voltage, but back to the drawing board!

-- I saw an angel in the marble and I carved until I set him free-Michelangelo

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