all while the battery gets charged.
Any smart charging device can only make a guess at the max. capacity unless it does a full load/unload/load cycle.
this post was submitted on 27 Nov 2024
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Check Opus and Maha branded intelligent chargers
I think some of the smarter rc chargers can do most of that. Its mostly for smaller capacity stuff though.
Chargers for RC model vehicles (car, airplane, helicopter) can do most if not all of that stuff, but you will have to be comfortable with soldering connectors as there is no universal standard connector system for any of the battery types you mentioned, and even standard size 18650/21700 cells are rarely used for RC purposes. The RC hobby has mainly settled on XT60 and its smaller cousin XT30 as the closest you'll find to a standard, but even within the hobby many batteries use other connectors. Snipping leads and soldering connectors is not an optional skill, the currents involved can be very large and will easily melt a poor connection made with poor skills or some hacky clip-on connector.
For charging, this is the sort of thing I use, no promises. RC chargers also include a balancing system to allow it to balance different cells across an entire battery pack but you will have to have individual wires junctioned in between each of those cells so it can sense their voltage and top them up as needed.
Also most RC chargers don't bother having anything to do with lead acid (automotive style 12V or otherwise), as they are much too high amperage and heavy for any sort of RC use and they use a wildly different charging design and have much more complex health monitoring and maintenance needs. Not recommended for that, use an automotive, marine or off-grid style battery maintainer and repairer for those. The one I linked says it does handle SLA (sealed lead acid) but I wouldn't trust it to do a good job. Compromises have likely been made. You'd be better off with a dedicated unit for those if you are going to be dealing with them.
Curious why you'd care about nicad? Or is it just for the sake of completeness?
Just for completeness. I mostly have LiPo and NiMh cells.
I'm not aware of a combined health system and charging system. Although, as another commenter said, some RC chargers come close. But it also depends on the battery types you're wanting to use.
Why are you looking for this, though?
I have quite a few old-ish batteries lying around, mostly LiPo 18650 and NiMh cells, and do not have a way to test them. Also my charger is not so capable. Therefore I was wondering if I could get a device with which I can test and charge any of them.
I have some chargers for my RC helicopters days. They're awesome. They can charge almost any battery type (although it took ages to charge my 12V 200Ah AGM battery), and when it's done it plays a small fanfare.