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I've used an H4155 on and off for about a decade now and every two years or so the backup battery begins to increase in standby voltage and fail. I prefer to replace it just for the sake of it running optimally (though it is not required for normal operation; just battery swaps) but over the last few years trying to source both the battery (Varta V20HR) and premade replacements has been difficult. I'm tempted to forgo it completely since I rarely use WiFi on it.

I can't tell if this is a sort of Molex connector or something proprietary as I've not seen anything like it and only have seen it in my iPAQs. It is also the same type of plug used for the microphone and the H4355's speaker. What makes it different is that the plug is perfectly rectangular. The underside (not pictured) is simply the two wires as it doesn't have the protrusion I've seen in CMOS/RTC batteries for my ThinkPads.

As most of the batteries have corroded I want to either source new connectors or replace the wiring as the negative wire I believe is the one the corrosion travels through and onto the connector. Curious as to which is easier or where to look for wire that thin.

h4355 backup battery socket

h4155/h4355 backup battery; the one with the battery is aftermarket

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    \$\begingroup\$ Looks like some sort of JST connector. \$\endgroup\$
    – Hearth
    Jan 16, 2019 at 19:50

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Picture is a little fuzzy and there is not pitch mentioned so this is a bit of a guess it looks something like SM02B-SURS-TF(LF)(SN)

Mates to connector 02SUR-32S

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  • \$\begingroup\$ I had to look up what pitch is and it's probably 1mm or less. The pictured battery without the cover is 11.4mm. \$\endgroup\$
    – Matt
    Jan 17, 2019 at 3:22
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    \$\begingroup\$ Just as an update that is the correct plug, though I ordered some that had a 2" cable and didn't realize it had a plug on each end. Snipped the cable in half, gently trimmed some wire, took a loose battery and taped it in and the iPAQ is charging it. Thanks again. \$\endgroup\$
    – Matt
    Jan 23, 2019 at 2:57

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