Electronics > Beginners

Dropping voltage from a Li-ion battery

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Cricri:
I never said NiCd were rubbish. Ok, I did. But that's only because I think it.
I don't think anyone will argue that Li-ion aren't way better, so given the opportunity to change a dead NiCD battery, I'd go for a Li-ion. They are normally expensive, but I work in a big company where people drop their "dead" batteries in bins. So I always check the bin, test the alkaline/coin cells (I've got dozen of batteries that were thrown away but still good), keep them if they are in date (I've got so many I don't take any chance taking ones that will soon leak), and I also take the Li-ion ones. I connect them to a cheap charging board at home, let them charge fully, and then check them again a month later. So far, I only got once a Kindle battery that dropped back to sub 3V after a month in storage, and of course, it went back into the bin. So since I got them for free, I don't mind using them in place of NiCd packs in El Cheapo made in China devices. The only bummer is getting one has big as possible that will fit. For the kid's RC car, I swapped the 700mAh NiCd with a 1700mAh li-ion, because that was the biggest I could fit and there was lots of space. For my shaver, I can only fit the smallest one I recycled, which is only 400+ mAh. That's because rechargeable AA are cylindrical, but li-ion packs are typically thin and flat, so obviously that's a big limitation.

spec: on the contrary, Antartica is great for batteries, never heard of the trick of storing batteries in the freezer? When I need to use them, I use the same trick I use in the UK when I get out of the pub late at night and find out the car lock has frozen over. Not only do I recycle electro-magnetic energy sources, but i also recycle heat energy that would otherwise be wasted.

james_s:
NiCd are not great by modern standards, but I generally don't convert devices from one chemistry to another unless the original is really inadequate. When a NiCd powered device needs new batteries I normally replace them with NiCd or NiMH so I can continue using the original charger.

spec:

--- Quote from: Cricri on December 27, 2018, 02:13:11 pm ---spec: on the contrary, Antartica is great for batteries, never heard of the trick of storing batteries in the freezer? When I need to use them, I use the same trick I use in the UK when I get out of the pub late at night and find out the car lock has frozen over. Not only do I recycle electro-magnetic energy sources, but i also recycle heat energy that would otherwise be wasted.

--- End quote ---
:-DD

spec:

--- Quote from: james_s on December 27, 2018, 07:10:51 pm ---NiCd are not great by modern standards, but I generally don't convert devices from one chemistry to another unless the original is really inadequate. When a NiCd powered device needs new batteries I normally replace them with NiCd or NiMH so I can continue using the original charger.

--- End quote ---
That is the sensible approach.

i was talking to a builder friend the other day and he is in the process of converting his old battery power tools to LiIon and mains- using a PSU. I didn't let on that I knew anything about batteries, but I am interested to know how he gets on.

By the way, AFAIK the price/performance sweet spot at the moment in LiIon 18650s is the 3.2Ah, 10A Panasonic NCR18650BD from eu.nkon.nl at Euro3.35

Psi:
Do they say NiCa on them? im guessing they are actually NiMh.

Best option is to just replace any crap NiCa/NiMh with good quality NiMh like eneloop.

Any lithium + switchmode system you add will need to be disconnected to prevent the switchmode draining the battery all the time.
And then you have to deal with charging the lithium battery
And if you don't do it properly there's a risk it will burn your house down in the middle of the night

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