Cache Battery Replacement

We have a 9406 Model 170 that has a failing cache batter pack. We no longer carry maintenance on this particular machine so I'm going to have to replace the part myself. Can anyone guide me to information on how to perform this procedure? I'm not even sure where the cache battery is located or if the server needs to be powered down prior to replacement. I recently installed a disk unit on this machine, so I'm not afraid to perform surgery as long as I have some info. Thank you for any help.

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We had a battery pack go not long ago on our 9406-720. The battery pack on our card was a typical cell phone type battery pack, (one of the bundle of 3 AA type batteries with a wire plug types). The pack is directly on the card (IOA or IOP, I forget which) you’ll need to be careful to keep your cables straight, and you’ll need to make sure you’re going for the right card if you have more then one array (we have 3 arrays of 15 each, so there’s a lot of room for error on our system if you don’t know how to read the SST card positions, etc)

My suggestion would be to look for a 3rd party service provider, and contract out the repair. If you get a phone battery instead of the IBM branded battery, you’ll save quite a bit of money, and a decent service provider won’t charge an insane amount for the hour or so of work they’ll do.

one note, no matter what you do, get a fresh full system save before you down the box, and replace the battery. with an older system, there’s a chance that one or more of the drives may not spin back up, among other possible problems. (always better safe then sorry)

If you’re located in their service area, I can recommend the provider that we use if you want, just send me a private message with you’re location (even if you’re outside of their service area, I’ll see if they can recommend someone for you)

good luck with your battery,


For a model 170, this Cache battery pack link might be your best bet.

The battery should be placed in the Error state before you do anything. This causes the system to stop write caching before the battery is removed. Thousands of pages of disk writes can be in cache and you need to ensure that those are written before any battery support is removed.

Read the instructions before doing anything. There are important warnings. Example:
Important: Removing the Cache Battery with the System/Partition in a powered off state may result in the loss of customer data. If the system has been powered down PRIOR to the battery service action, you MUST IPL to DST and continue this procedure BEFORE replacing the battery.

There are numerous later procedures for different hardware.


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  • CarterC19
    Only tip I could offer would be to remember to actually put the battery into 'Error' mode before you actually power down the system to change the battery. If it's just in 'Warning' mode, simply changing the battery is insufficient to put it onto OK mode. Sounds nuts, but I have done it this way every time. Dunno where I got that idea from, tho, so cannot give credit where it's due.
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  • Theprosfromdover
    You need to first understand how much battery life you have left. Assuming you are on v5r2 or earlier run the following to check. STRSST 1. Start a service tool 4. Display/Alter/Dump 1. Display/Alter storage 2. Licensed Internal Code (LIC) data roll down 14. Advanced analysis 1=Select for BATTERYINFO for Options type in -INFO -ALL and press enter Then roll through and check all that. Sample output: Battery Life Information for Resource DC01 Serial Number. . . . . . . . . . . . . : 1C-4018107 IOA Type-Model . . . . . . . . . . . . : 2757-001 Frame ID - Card Position . . . . . . . : 3C02-C02 Battery type . . . . . . . . . . . . . : Lithium Ion (LiIon) Battery State. . . . . . . . . . . . . : No battery warning/error was issued Power on Time (days) . . . . . . . . . : 300 Adjusted Power on Time (days). . . . . : 351 Estimated time to warning (days) . . . : 505 Estimated time to error (days) . . . : 582 Concurrently maintainable battery pack : No Battery pack can be safely replaced. . : No The other thing is you will have to take the system down to change the battery. One scam is to take the old battery out, wait about a minute and then pop it back in again. Apparently they have a 6 year life, but bring up a replace message after 3 or 4 years. Definitly do a SAV21 before changing it, since if it did go wrong you could easily lose all your data!!!
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  • HMauricio
    I've changed the cache batteries in a 9406-525, but now the system doesn't IPL. Anyone know what I have to do

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