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IBM 5170  -  Battery


IBM supplied a 6 volt lithium battery.
In the 5170's technical reference, the pinout diagram for the battery connector (J21) on the motherboard shows "6 Vdc".

Pretty much, any 6 volt non-rechargeable battery with the required connector, is going to do the job.
Fitting a rechargeable battery is pointless, because the 5170 motherboard does not contain battery charging circuitry.

If you are changing the battery because of a 161 error, then note that after battery replacement, the 161 will remain until you complete the SETUP procedure.


Motherboard connection

The battery connects to J21 on the motherboard.

5170_battery_j21.jpg


Original battery

Below is one of the IBM supplied batteries; there were others.

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It is 6 volts, lithium (not the same as lithium-ion), and IBM part number 8286121
Understandably, IBM do not sell the battery anymore.
There used to be many companies that sold a replacement as part number 8286121, but that is no longer the case.

The pictured battery has a resistor on top (possibly for short-circuit protection).  The replacement battery does not need to have a resistor.



Four 1.5 volt AA cells

Using the battery holder pictured below, four standard 1.5 volt AA cells can be used to provide 6 volts.

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A search of eBay using battery holder aa 6v may find this battery holder.  Pay attention to the connector.

I have not seen these (ones with the required connector) for quite a while.  Most of the AA holders that I see, have no connector at the end of the wires.  If you have soldering ability, you could bring across the connector from the old battery.  Or perhaps use single-post connectors as pictured at here.



Three 1.5 volt AA cells

As above, but three cells instead of four, to provide 4.5 volts.



3.6 volt lithium

Some people have used a 3.6 volt lithium battery.

I consider a 3.6 volt battery in an IBM 5170 to be borderline.  With a 3.6 volt battery fitted, some 5170 motherboards may keep the CMOS settings but lose time.  (technical info)

A particular type of 3.6 volt battery is pictured below.

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