Battery capacity testers with low-voltage cut-off?

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Robin Dobbie
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Battery capacity testers with low-voltage cut-off?

I’ve seen those 150W/180W/200W capacity testers on a naked board with a cheap CPU fan that let you dial in up to a 20A draw. Their main problem is they just keep going til the cell is effing totally dead. So you have to babysit each cell. They are cheap, $36 to $50. I’ve seen 6-60V and 12-36V external cut-off relays, but nothing down to 2.5-3.3V where we’d want it for testing cells.

HJK did a review on a logging capacity tester, but it only went up to 4/5A draw. I can’t even recall if it had a low-voltage cut-off. But 5A draw is probably not enough, anyway. HJK did show me some more expensive testers in the $200+ range, but I was hoping to save some coin.

There’s this one:

They’re between $70 and $100-ish depending on max current capabilities. 1A-5A is around $70, 10A up to $90, 20A $92+. Theoretically 200W of dissipation ability, but the fan doesn’t look it, I can upgrade that. Watched a couple videos. Seems to have a cut-off voltage from 0-30V? 4-wire measurement for better accuracy. Has a USB cable and software for plotting a graph. I haven’t seen that demonstrated, but only because I’ve just watched a couple videos. There’s more videos. Too many videos, even.

Anyone have one? Critiques?

d_t_a
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Several of the ZKE-Tech EBD-series can have voltage cut-off (I believe HKJ has tested/reviewed a few of them)

ZKE-Tech’s website (but unfortunately it’s mostly in Chinese language, an online translator might help)
http://www.zketech.com/

ZKE-Tech has the EBD-A20H like the one you showed. I believe that model is only for discharging (up to 20 Amps max, and 200 watts max), can be constant current (Amps) or constant power (Watts) discharge, and log into a computer using the EB Tester Software (English).

There’s also the EBC-A10H, which can be for charging (up to 5Amps) and discharging (up to 10 Amps max) ; check specs for more details. I believe some people here in BLF do use it (seem to recall maukka referring to this model in one of his reviews before).

There’s the smaller EBD-M05 (5 Amps / 30 watts max), this is also 4-wire measurement. Can also control cut-off voltage. Price should be somewhere in the US$20 vicinity.

And likely some other models I haven’t really tried checking from their site.

(I have the EBD-USB+ and EBD-M05 although I don’t have a proper battery cradle/holder so I haven’t really used my EBD-M05 much ; although I use the EBD-USB+ quite regularly for checking USB devices, powerbanks, etc).

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There’s a 4-wire discharger model of the ATorch/HiDance DL24P (the earlier model is 2-wire, but the later model is now 4-wire).
Voltage cut-off can be user-controlled. I think price is somewhere around $40..

The not so good thing for this one is the software is not so good, compared to the EB Tester software.

(there’s some discussion of the DL24P here, verify if it’s referring to the 2-wire or newer 4-wire version)
https://www.eevblog.com/forum/testgear/cheezeball-dc-load-dl24p-pump-or-...

In any case, its build quality (from the user feedback) doesn’t seem to be that good, and although listed is 150w or 180w, it’s not recommended to use anywhere near those amount of power or the device (MOSFET?) will fail. I suppose for lower power requirements, it should still be ok though.. I’m not sure of the accuracy compared to the ZKE ones though.

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While browsing around battery capacity testers before, I’ve also come across mention of the EastTester ET5410 / ET5411 (and some related models), these appear to be more expensive than the ZKE-Tech (around $200+). HKJ’s multi-logger software mentions supporting these models too.

http://www.easttester.com/a/Product_introduction/ET54_series_single_doub...

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I’ve also read about the West Mountain Radio Computerized Battery Analyzer, but it’s a lot more expensive: around $200 vicinity… so it’s more expensive than the ZKE models (which I think should be OK). Just need to find or build a good-quality (can handle higher amps) battery cradle/holder…

http://www.westmountainradio.com/cba.php

d_t_a
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This site has a review of several of the smaller battery discharge testers (has voltage cut-off):

https://www.sevarg.net/tag/batterytesters/

I think the EBD-M05 is rated more highly.
https://www.sevarg.net/2018/12/16/the-ebd-m05-battery-tester-195v-5a-30w/

Followed by the TEC-06 and ZB206+, which seems to be OK for their price.
https://www.sevarg.net/2018/01/14/tec-06-serial-battery-tester-review/
https://www.sevarg.net/2016/01/31/zb206-battery-tester/

The ZB2L3 and HW-586 not so much..
https://www.sevarg.net/2015/10/10/zb2l3-v20-zhiyu-battery-tester/

Robin Dobbie
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Thanks for the reply! I s’pose I should have updated my post. I ended up ordering the KP184 that HKJ suggested in another thread from banggood.

I ended up getting a coupon from Fin17 and that brought my total to 161 or something like that.

So without having gotten the KP184 I’m already pretty anxious about what kinds of problems it might have. I didn’t realize right away but it looks like it has no cell testing ability without a computer and software(which it doesn’t come with) Also some people report great difficulty getting it to communicate with a computer upto and including just having to buy a whole new unit to get comms to work. We’ll see.

The manual states not to open it arbitrarily, but from what I’ve read on youtube comments/videos/EEVblog posts, that’s absolutely something anyone who would like to live should do(with it unplugged). Not too far off from when I bought an ebay hot air station with internal wiring that would have either destroyed the unit, immediately blown a breaker, or both!

Looks like I’ll have to buy a serial to USB adapter because RS-232 and 485 is what’s on the back of these puppies(if it works).

Lots of software options, some of which costs money. Tired

But uh, 400 watts or 40 amps! Look at all them amps! Sir, would ya just look at em?! The west mountain radio doodad is also rated 40A, but only 150W. Does come with nice software and USB, though. And murican. I have vague notions I might want to test at higher wattages than just what a single cell could generate and their 500W option is ridonkulously-priced.

Looks like I’ll have to build a cell holder. The ones you can buy for $10 or $14 or whatever aren’t even assembled, but they’re only rated at 10A. So, forget that. I’ve got some ideas and I’ve seen some ideas. Just have to try something. I see some people just screw copper plates to quick grip clamps.