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LONGER RUN TIME / Upgrading Battery / Using a Bigger Battery

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KnightRacer1K_apc
Crewman
Crewman
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LONGER RUN TIME / Upgrading Battery / Using a Bigger Battery

This was originally posted on APC forums on 9/13/2010


Hi, I have a Back-UPS CS 350 and I'm looking to replace the battery. By default it comes with a 12v 7Ah battery, but I want to put a larger capacity battery inside. I've been looking at a 18Ah or 21Ah. My apologies if this has already been discussed, I searched the forums and couldn't find anything..

Now, of course, I know this is not recommended by APC/voids warranty etc etc. And of course, that the battery won't fit in the box. This is as much an experiment as it is a solution. I just want to know of any 'side effects' or problems I may have by doing this, or anyone else's experience with doing something like this. I received this unit for free with a dead battery, so I don't really care if I break it. I'm a technician and I know my way around electronics.

I have heard that using a larger capacity, which leads to longer discharge time, can cause the unit to become hotter. I was going to install a fan in the unit to help keep it cool. And another thing I've heard is that, while using a larger battery, the unit will discharge normally (just last longer), but the charging circuit will not be able to completely charge the larger battery.. But everyone just says it 'might'. Has anyone done or tried this, and was it able to charge correctly?

Thanks! Any information or suggestions is appreciated!

Gregory

Message was edited by: KnightRacer1K


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KnightRacer1K_apc
Crewman
Crewman
0 Likes
0
151

Multiple 12v 7Ah batteries in parallel...

This was originally posted on APC forums on 9/19/2010


No one has ever put a bigger battery in one of these UPS's?

Ok, how about this, what If I buy two or three 12v 7Ah batteries, and connect them in parallel? Would that be more efficient, as far as the charging circuit? Or would it essentially be the same as buying one larger 12v 21Ah battery?

Thanks! Any, any input or feedback is much appreciated!

-Gregory

See Answer In Context

3 Replies 3
BillP
Administrator Administrator
Administrator
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151

Re: Multiple 12v 7Ah batteries in parallel...

This reply was originally posted by Angela on APC forums on 10/13/2010


keep in mind that these UPSs, especially the smaller ones are designed to charge the batteries that they ship with in 18 hours or so. they have small chargers like between 10-30 watts. using a third party larger battery makes sense for a really long time but you essentially void your warranty and then will run into longer charge times.

KnightRacer1K_apc
Crewman
Crewman
0 Likes
0
152

Multiple 12v 7Ah batteries in parallel...

This was originally posted on APC forums on 9/19/2010


No one has ever put a bigger battery in one of these UPS's?

Ok, how about this, what If I buy two or three 12v 7Ah batteries, and connect them in parallel? Would that be more efficient, as far as the charging circuit? Or would it essentially be the same as buying one larger 12v 21Ah battery?

Thanks! Any, any input or feedback is much appreciated!

-Gregory

KnightRacer1K_apc
Crewman
Crewman
0 Likes
0
150

LONGER RUN TIME / Upgrading Battery / Using a Bigger Battery

This was originally posted on APC forums on 9/13/2010


Hi, I have a Back-UPS CS 350 and I'm looking to replace the battery. By default it comes with a 12v 7Ah battery, but I want to put a larger capacity battery inside. I've been looking at a 18Ah or 21Ah. My apologies if this has already been discussed, I searched the forums and couldn't find anything..

Now, of course, I know this is not recommended by APC/voids warranty etc etc. And of course, that the battery won't fit in the box. This is as much an experiment as it is a solution. I just want to know of any 'side effects' or problems I may have by doing this, or anyone else's experience with doing something like this. I received this unit for free with a dead battery, so I don't really care if I break it. I'm a technician and I know my way around electronics.

I have heard that using a larger capacity, which leads to longer discharge time, can cause the unit to become hotter. I was going to install a fan in the unit to help keep it cool. And another thing I've heard is that, while using a larger battery, the unit will discharge normally (just last longer), but the charging circuit will not be able to completely charge the larger battery.. But everyone just says it 'might'. Has anyone done or tried this, and was it able to charge correctly?

Thanks! Any information or suggestions is appreciated!

Gregory

Message was edited by: KnightRacer1K