Help - Alarm battery replacement

Kosmik said:
Either sound is not good. Check the terminals of your battery and that the connectors are on tight and not arcing. If the noise is coming from the battery itself, then you could possibly have a chemistry issue, in that case I'd disconnect and immediately do a RMA as its dangerous.
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I connected it the same way as the lead acid was connected, red wire to red, black to black. It's coming from the battery, and every now and then it will stop and then start again.
 
Tomtomtom said:
If it's very faint like you need to put your ear to it to hear it soft then it's probably just the sound of an inductor being switched at high frequency on the BMS board - and nothing to worry about.
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It's fairly faint, sounds like fizzing/ I guess kind of buzzing but a 'softer buzzing', not like 'bzzzz' more like 'fzzz'
 
derp90 said:
I connected it the same way as the lead acid was connected, red wire to red, black to black. It's coming from the battery, and every now and then it will stop and then start again.
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Could be the bms is faulty. The lithuims often normally have "fatter" terminals than the SLA, so not the way you wired it but make sure the terminals are full contact. But if its intermittent then probably something with the BMS. Either way, raise it with the vendor.
 
I fitted a Lifepo4 years ago it works...

I had a 7Ah in but now use a 20Ah.

Works well....

But! In heavy Loadshedding like the recent stage 6 with 2 hours on 2 hours off, the battery gets a bit too flat, then the really weak, crappy slow charger of the alarm system can't charge it.

I then fit my fully charged spare 7Ah and use a Lithium charger to recharge the 20Ah over the next 35 hours.
Once it's sitting over 13.1v I swop them back again.

But stages 2 to 4 ~ no issues...
 
Kosmik said:
Could be the bms is faulty. The lithuims often normally have "fatter" terminals than the SLA, so not the way you wired it but make sure the terminals are full contact. But if its intermittent then probably something with the BMS. Either way, raise it with the vendor.
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I received a replacement battery from the vendor, but the new battery does exactly the same thing. I don't know if the sound is coming from the battery or the alarm system itself. I can't hear it if I close the cupboard where it sits.

Should I just ignore it or could this be a serious issue?
 
derp90 said:
I received a replacement battery from the vendor, but the new battery does exactly the same thing. I don't know if the sound is coming from the battery or the alarm system itself. I can't hear it if I close the cupboard where it sits.

Should I just ignore it or could this be a serious issue?
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Look, sounds are never good but I'd it's a second battery then I would suspect your alarm and charging circuit. Try isolate the sound but in fairness in the end its just a battery and in resting state , it's being charged not providing power.

Try this, remove your ac so it runs off the battery. If the sound stops then it's likely the charge circuit on the alarm. Also would explain why it comes and goes.
 
Kosmik said:
Look, sounds are never good but I'd it's a second battery then I would suspect your alarm and charging circuit. Try isolate the sound but in fairness in the end its just a battery and in resting state , it's being charged not providing power.

Try this, remove your ac so it runs off the battery. If the sound stops then it's likely the charge circuit on the alarm. Also would explain why it comes and goes.
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I'll try it and report back.

It's an older alarm system that was running off a lead acid battery, and I've read of some incompatibilities with LifePO batteries, so I was also wondering if it was this.
 
Kosmik said:
Look, sounds are never good but I'd it's a second battery then I would suspect your alarm and charging circuit. Try isolate the sound but in fairness in the end its just a battery and in resting state , it's being charged not providing power.

Try this, remove your ac so it runs off the battery. If the sound stops then it's likely the charge circuit on the alarm. Also would explain why it comes and goes.
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Okay, as soon as I switch the AC power off, the sound immediately stops. Is this cause for concern or just the charge circuit sound for this type of battery?
 
derp90 said:
Okay, as soon as I switch the AC power off, the sound immediately stops. Is this cause for concern or just the charge circuit sound for this type of battery?
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More likely the circuit is failing. No way it would be stressing the battery or vice versa, alarm chargers are very very low.

Should be fine.
 
Kosmik said:
More likely the circuit is failing. No way it would be stressing the battery or vice versa, alarm chargers are very very low.

Should be fine.
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It could be that the lithium is stressing charge circuit a bit more

ie the lead acid doesn't work the charging circuit as hard as it easily lifts the voltage and the charge rate slows down

While with a lithium it will use whatever the charging circuit can push until battery reaches charge circuit max voltage
 
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