Back-UPS BX750MI Battery Replacement

[Buadhai]

After a lot of email go around with Schneider tech support they said:

" This unit does not have a user-replaceble battery function so battery replacement is not recommended but a whole unit replacement instead in case of battery failure."

On the other hand, they sell a replacement battery for this unit here:

https://www.se.com/th/th/product/RBC17/apc-replacement-battery-cartridge-vrla-battery-9ah-12vdc-2yea...

So, can I replace the battery, or not?

[Teken · Accepted solution]

Yes of course you can replace the battery yourself. How does the APC guy think they got the battery inside the first place?!? 🤦‍♂️

You can by any CSB branded 12 VDC 9AH high rate cell. It doesn’t have to be a APC rebranded cell.

Questions Ask . . . 👍

[Buadhai]

Will this one work: 

12V 9AH UPS CSB BATTERY HR1234W F2

(The Thai script just says it has a one year warranty.)

[Teken · Accepted solution]

Yes, perfect drop in replacement. 👍

[Buadhai]

Sorry for the continued confusion. I watched a YouTube video to learn how to replace the battery:

https://youtu.be/gRI50MITPio - How To Replace Battery UPS APC BX750MI-MS

The presenter used a CSB GP1272 F2 12 Volt 7.2 Ah (15x6.5x9.5)

So, should I use that or the CSB HR 1234W F2  12v 9Ah (15x7x10)

They seem to be slightly different in size. They are about the same price.

[Teken · Accepted solution]

The original unit comes with a 12 VDC 9AH cell which offers longer operational runtime.

The only reason anyone buys a 12 VDC 7.2AH cell is because it’s cheaper.

Both are the same physical outside dimensions regardless of what you read on the APC website.

Questions Ask . . . 👍

[Buadhai]

Thanks for taking the time to be so helpful. 

[Buadhai]

Reply from Schneider:

"If your UPS is experiencing issues due to deteriorating batteries, you can replace the battery with a new one.

"However, it is advisable to have the replacement done by a skilled dealer or service center to avoid potential "damage to the device.

"Remark : It is not recommended that customers replace the battery themselves.

"Best Regards, 

"nnnnnn nnnnnn
"Primary Technical Support Engineer l Customer Care Center"

[Teken]

If you follow the steps outlined in the video you will be fine. There is only one safety precaution that you need to follow and that is to insure the AC plug is disconnected from the wall outlet. ☝️

As seen in the video there is only four screws to remove. Than gently push in the front bezel cover (FIC) retainer (Force Retaining Clip) so the two halves can be separated.

Lastly, if your unit includes a data port to connect to APC Power Chute Software. Confirm if there are the following options available and present: Battery installation date, self test, battery calibration.

If all three are present insure you update the battery installation date. Follow up with manually initiating a Self Test and let pass and allow the battery to recover to 100% SOC (State of Charge).

Complete the process by manually initiating a battery calibration with at least 30% attached load. Let the process complete and allow the battery to recover and recharge back to 100% SOC.

If none of them are present nothing to worry about for now.

Questions Ask . . . 👍