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Defunct batteries on APC Smart UPS 1000
I recently purchased a second hand APC Smart UPS 1000 on ebay - when it
arrived it was totally dead. (Seller gave a full no-quibble refund which was nice.) Having done some research the most likely cause seemed to be the batteries - if the unit thinks the batteries are dead then it won't turn on. Taking it to work and temporarily swapping the battery with an identical unit at work revealed this to be the case. The replacement batteries (even non-branded ones) are not cheap, so I was wondering whether its worth looking at either of the following two options - or am I just wasting time (and money) and is it better to just buy new batteries? 1. It takes two 12v sealed lead-acid batteries which are glued together (strong glue!) so they can be handled pretty much as a single unit, but there are two of them. I think the unit was probably left on the shelf for a long time and has discharged (because I get the impression that it worked the last time it was used). One of the batteries reads at 3v the other at 9v. So is it worth trying to charge these externally to the UPS to see if they will rechange? If so how? can I use a car battery charger or do I need something specialised? 2. Since the two batteries read 3v and 9v, is it viable/sensible to replace the 3v one and keep the 9v one (hoping it will charge and come up to 12v)? This would be about half the replacement cost, but I don't know whether mixing new and old batteries like this is a good or a bad thing. Thanks in advance. -- Brian Cryer http://www.cryer.co.uk/brian |
#2
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Defunct batteries on APC Smart UPS 1000
On Sat, 31 Jul 2010 08:13:45 +0100, "Brian Cryer"
not.here@localhost wrote: I recently purchased a second hand APC Smart UPS 1000 on ebay - when it arrived it was totally dead. 1. It takes two 12v sealed lead-acid batteries which are glued together One of the batteries reads at 3v the other at 9v. So is it worth trying to charge these externally to the UPS to see if they will rechange? If so how? can I use a car battery charger or do I need something specialised? If they are (sealed) lead acid batteries, you can use a normal car battery charger. Keep away from those 'fast blasters' though. (Those may come in handy if you need to juice a 200 Ah car battery in 10 minutes, but they may blow your 30 Ah UPS batteries.) Limit the charge current to say c / 10. That makes 3 amps for a 30 Ah battery. 2. Since the two batteries read 3v and 9v, is it viable/sensible to replace the 3v one and keep the 9v one (hoping it will charge and come up to 12v)? No. Never replace 'half a battery'. It's just a waste. (I wouldn't even be surprised if batteries are paired in the factory before they get glued together !) But it doesn't hurt charging the old batteries both till 'full' and see how they behave. You can still replace them if they prove not to be useful. -- Kind regards, Gerard Bok |
#3
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Defunct batteries on APC Smart UPS 1000
"Gerard Bok" wrote in message
... On Sat, 31 Jul 2010 08:13:45 +0100, "Brian Cryer" not.here@localhost wrote: I recently purchased a second hand APC Smart UPS 1000 on ebay - when it arrived it was totally dead. 1. It takes two 12v sealed lead-acid batteries which are glued together One of the batteries reads at 3v the other at 9v. So is it worth trying to charge these externally to the UPS to see if they will rechange? If so how? can I use a car battery charger or do I need something specialised? If they are (sealed) lead acid batteries, you can use a normal car battery charger. Keep away from those 'fast blasters' though. (Those may come in handy if you need to juice a 200 Ah car battery in 10 minutes, but they may blow your 30 Ah UPS batteries.) Limit the charge current to say c / 10. That makes 3 amps for a 30 Ah battery. 2. Since the two batteries read 3v and 9v, is it viable/sensible to replace the 3v one and keep the 9v one (hoping it will charge and come up to 12v)? No. Never replace 'half a battery'. It's just a waste. (I wouldn't even be surprised if batteries are paired in the factory before they get glued together !) But it doesn't hurt charging the old batteries both till 'full' and see how they behave. You can still replace them if they prove not to be useful. -- Kind regards, Gerard Bok Thanks Gerard. I've put the batteries on charge, but they clearly aren't charging so it looks like I'll need to buy new ones. -- Brian Cryer http://www.cryer.co.uk/brian |
#4
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Defunct batteries on APC Smart UPS 1000
Brian Cryer wrote:
"Gerard Bok" wrote in message ... On Sat, 31 Jul 2010 08:13:45 +0100, "Brian Cryer" not.here@localhost wrote: I recently purchased a second hand APC Smart UPS 1000 on ebay - when it arrived it was totally dead. 1. It takes two 12v sealed lead-acid batteries which are glued together One of the batteries reads at 3v the other at 9v. So is it worth trying to charge these externally to the UPS to see if they will rechange? If so how? can I use a car battery charger or do I need something specialised? If they are (sealed) lead acid batteries, you can use a normal car battery charger. Keep away from those 'fast blasters' though. (Those may come in handy if you need to juice a 200 Ah car battery in 10 minutes, but they may blow your 30 Ah UPS batteries.) Limit the charge current to say c / 10. That makes 3 amps for a 30 Ah battery. 2. Since the two batteries read 3v and 9v, is it viable/sensible to replace the 3v one and keep the 9v one (hoping it will charge and come up to 12v)? No. Never replace 'half a battery'. It's just a waste. (I wouldn't even be surprised if batteries are paired in the factory before they get glued together !) But it doesn't hurt charging the old batteries both till 'full' and see how they behave. You can still replace them if they prove not to be useful. -- Kind regards, Gerard Bok Thanks Gerard. I've put the batteries on charge, but they clearly aren't charging so it looks like I'll need to buy new ones. If they are suphated(the plates), it sometimes helps, to put a high voltage on them. Rectify the mains, put a hetaer elements or big lamp in series with it, and feed the battery for a few minutes, or until the series device shows activity (lamp fully burning ot heater getting hot). Then try again to charge. |
#5
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Defunct batteries on APC Smart UPS 1000
"Sjouke Burry" wrote in message
... Brian Cryer wrote: "Gerard Bok" wrote in message ... On Sat, 31 Jul 2010 08:13:45 +0100, "Brian Cryer" not.here@localhost wrote: I recently purchased a second hand APC Smart UPS 1000 on ebay - when it arrived it was totally dead. 1. It takes two 12v sealed lead-acid batteries which are glued together One of the batteries reads at 3v the other at 9v. So is it worth trying to charge these externally to the UPS to see if they will rechange? If so how? can I use a car battery charger or do I need something specialised? If they are (sealed) lead acid batteries, you can use a normal car battery charger. Keep away from those 'fast blasters' though. (Those may come in handy if you need to juice a 200 Ah car battery in 10 minutes, but they may blow your 30 Ah UPS batteries.) Limit the charge current to say c / 10. That makes 3 amps for a 30 Ah battery. 2. Since the two batteries read 3v and 9v, is it viable/sensible to replace the 3v one and keep the 9v one (hoping it will charge and come up to 12v)? No. Never replace 'half a battery'. It's just a waste. (I wouldn't even be surprised if batteries are paired in the factory before they get glued together !) But it doesn't hurt charging the old batteries both till 'full' and see how they behave. You can still replace them if they prove not to be useful. -- Kind regards, Gerard Bok Thanks Gerard. I've put the batteries on charge, but they clearly aren't charging so it looks like I'll need to buy new ones. If they are suphated(the plates), it sometimes helps, to put a high voltage on them. Rectify the mains, put a hetaer elements or big lamp in series with it, and feed the battery for a few minutes, or until the series device shows activity (lamp fully burning ot heater getting hot). Then try again to charge. Thank you for the suggestion. This might be the perfect solution, but its way outside my comfort zone. (I just don't like touching the mains.) -- Brian Cryer http://www.cryer.co.uk/brian |
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