and that bad soldering
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only looks like so for some reason. Cleaned it up and shot a photo from my microscope.Attached FilesComment
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Yes, it does… and the 7805 doesn’t have a hole in it. Not sure why it looked like that on the pictures that I took the first round. I did find a couple of shoddy solder joints and fixed those, but I still don’t think that’s the problem.Comment
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Put it back together and no dice. Same thing.
I think there is a firmware bug.
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The whole board looks like an early prototype. The current-sense resistor is jumpered out 0R, so many MCU pins wasted not used, and then the tiny film caps seem to be charged and discharged into the battery or something to measure ESR.
It looks hokey and I wouldn't trust its numbers. Most testers are using one power mosfet and resistor to pulse load the battery at say 6A, measure the ramp down and calculate ESR.Comment
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Did you try use it flipped - set for AGM but on a flooded battery, set to FLOODED and use on AGM?
The voltage verses state-of-charge chart in has small differences, if it's correct in the firmware. I might have a messed up flooded battery table.Comment
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There is no firmware for that thing that I can find.Comment
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Hello, all.
Cyberpower Battery Backup Unit.
I bought two new ML18-12 batteries through Amazon (They have already refunded my money for the two batteries as we thought the batteries might have been bad.)
When I got them in, they were not fully charged. I connected them to the UPS and waited 24 hours before connecting any networking equipment.
In parallel, they read 24v, but within 24 hours, the meter on the front of the unit dropped from 4 to 3 bars on the battery charge indicator.
Checking the voltage, it was down to 22v.
I quickly removed everything... -
Order my parts from mobilesentrix.com and iPhone batteries have been excellent. Recently got 3x bad A1534 (2015) batteries. All would work until ~30-40+% and drop to < 10% instantly. Typical sign of cheap batteries.
Perhaps the less popular A1534 model's aftermarket batteries are more source limited. Just find it surprising quality from mobilesentrix (usually fairly high quality aftermarket parts) have been so poor.
BTW, this isn't the only defective parts I've had from mobilesentrix. Amongst others including iPad Air touch screen and A1989 touch bar (display was... -
Hi friends of electronics
What you see in the video and pictures attached is the circuit for charging the batteries of a DC motor.
The problem is that this circuit cannot charge the batteries (3 1800mAH NiMH batteries) any more. When the circuit was OK, its green LEDs lit up one at a time to show that the batteries have charged more. But now that the circuit is flawed, LEDs light up as you see in the video and at the same time successive beeps are heard.
Please help me fix this circuit.
(the datasheet of the IC: https://pdf.datasheet.live/28... -
Problem description:
My UPS requires new batteries every ~3 months; in this time frame, an average of about 5 to 10 power flickers or short power interruptions (< 2 minutes) occur. After an average of 3 months, a new pair of batteries begins to fail to keep the UPS up during any flicker or power interruption. The load it powers is a single computer/workstation running 24/7 with a continuous consumption between 200W to 300W.
UPS model:
The Atlantis 1001 is a non-inexpensive (~120€ back then) home/office offline UPS, rated 1000VA, 600W, designed for two 7Ah... -
Here is a website I have ordered from before and the results that they claim are correct from what I have seen from the batteries I have bought from them
BatteryHookUp.com
https://batteryhookup.com/collection...odem-batteries
I have test about 5 battery packs ( out of 15 battery packs I bought) and have had very good results and so far have not found any bad cells
I have also bought these battery packs before on EBay and they are a good source for a battery case that holds 18650 batteries however...
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