Hi,
I was given a battery booster/jump start power pack to repair. The problem I was told was that it would not charge, and was told that more than likely it was the charger that was at fault.
I tested the adapter/charger it was capable of putting out its rated 15V and under dummy load close to the rated 500mA.
Checked the socket and plug everything seemed fine.
Tried to charge it on my own reliable SLA charger and still nothing. When connected no current rise was seen on the ammeter.
So I took it appart and found the that 12V 17Ah internal battery was discharged to 1V.
Moved it around and noticed that the case was bulged and had split at some stage.
This device is also relatively new and has been used/ charged and discharged only a couple of times.
What I tought odd, was that there was no charge circuit within this booster pack to monitor overcharging/float charging..etc... the wall adpter literaly plugs 15v directly aacross the battery. I was always of the thinking that non smoothed power adapters were not suitable for charging SLA batteries.
What I would like to know is has anybody else witnessed this type of battery failure before?
What causes this type of failure........overcharging.....deep dis-charging, too much load on the battery?
(On the blue label in photo 1 it can be seen that the device boasts 900A starting current, the positive negative tabs alone due to the thickness would barley stand 100A for 10seconds, let alone 900A for 1 second of starting, where did they get 900A amps from? the battery certainly is physical not capable of even producing 100A for 10 seconds.)
Regards NM
I was given a battery booster/jump start power pack to repair. The problem I was told was that it would not charge, and was told that more than likely it was the charger that was at fault.
I tested the adapter/charger it was capable of putting out its rated 15V and under dummy load close to the rated 500mA.
Checked the socket and plug everything seemed fine.
Tried to charge it on my own reliable SLA charger and still nothing. When connected no current rise was seen on the ammeter.
So I took it appart and found the that 12V 17Ah internal battery was discharged to 1V.
Moved it around and noticed that the case was bulged and had split at some stage.
This device is also relatively new and has been used/ charged and discharged only a couple of times.
What I tought odd, was that there was no charge circuit within this booster pack to monitor overcharging/float charging..etc... the wall adpter literaly plugs 15v directly aacross the battery. I was always of the thinking that non smoothed power adapters were not suitable for charging SLA batteries.
What I would like to know is has anybody else witnessed this type of battery failure before?
What causes this type of failure........overcharging.....deep dis-charging, too much load on the battery?
(On the blue label in photo 1 it can be seen that the device boasts 900A starting current, the positive negative tabs alone due to the thickness would barley stand 100A for 10seconds, let alone 900A for 1 second of starting, where did they get 900A amps from? the battery certainly is physical not capable of even producing 100A for 10 seconds.)
Regards NM
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