DIY Battery Backup Sump Pump System

Hello All,
I am in the market for a battery backup sump pump system. I have searched around for best pricing, and it would seem that everything is INCREDIBLY expensive (or so I think). I thought it was ridiculous to pay $130.00 for a small backup pump. I guess to soften the blow it comes with a plastic case (about the size of a cheap plastic tool box) for a battery and some PVC piping. In addition, you have to purchase a battery AND battery acid for $118. One system I looked at was $246.00 for the case and pump, $115 for a battery and $17 for battery acid. YIKES! This doesnt include what other miscellaneous pieces I might need. I would like to custom build my own for less. I have an electrician and a plummer in the family So you may ask, why am I coming here for advice? The answer is, I would like to educate myself first and prepare said proposal before I approach anyone for help. I appreciate any advice on the subject. I really dont want to spend $500 on this project.
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Do you have city water or a well? If you have city water, I suggest a water power back up. After all a battery powered pump is not going to pump a lot of water too long before it depletes the batteries. The water powered jet pump will likely cost a lot less was well.
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is youre sump higher than the street or low area in your yard away from home?
if so dig a ditch and run a line to daylight, gravity tends to be highly reliable.
a battery sump pump will require replacing battery every few years, and ideally should have a seperate drain line.
so a single point failure cant occur.
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Basepump and Zoeller make city water powered pumps, batteries and chargers go bad.
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You get what you pay for.
Regarding the other replies... I have installed two water powered systems that were POSs; I would want them in my house. Fortunately don't need a pump, let alone a backup, but if I did I would use a battery pump.
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The "Pump Buddy" by Bur-Cam is junk, the pump works OK but the float operated water valve is so flimsy that after sitting in the off position for a few months, it won't turn on. The valve also drips water constantly.
I replaced it with a BasePump system. Works great and drains a lot of water quickly. A big plus is the fact the pump is not in the sump but above it, relieving a lot of crowding in my small diameter sump. Not cheap, but much better value than the flimsy Pump Buddy which is way overpriced for what you get.

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Thanks you all for your responses...
Jack,
Do you have a battery powered BasePump system, or is yours water powered? Was it very hard to install?
Thanks again.
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My Bad... I meant to ask that question to EXT.. not Jack... :)
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My Bad... I meant to ask that question to EXT.. not Jack... :)
I have the water powered pump with the 3/4" water supply and tossed out the Pump Buddy.
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