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The Compaq iPAQ Pocket PC 3830. It measures 8.1 cm by 13.3 cm. It was introduced by Compaq in April of 2000. iPAQ was borrowed from Compaq's earlier iPAQ Desktop Personal Computers. The device used a Windows Mobile interface.

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Replacement battery purchase for Compaq / HP H3800 H3900 series

Hi guys 👋

Maybe someone knows a place to buy a replacement battery for Compaq iPaq H3835 or 3850 or any other in 3800 series (could be either Compaq or HP).

I have the following info on the battery:

  • 35H00004-00 Compaq HP iPAQ H3800 H3900 1600mAh Li-Polymer 3.7V
  • Replaces the following HP batteries:
    • 233488-001
    • 263897-001
    • 35H00003-00
    • DLP345794
  • Works with the following HP/Compaq iPaq devices:
    • iPAQ H3800iPAQ
    • H3830iPAQ
    • H3835iPAQ
    • H3850iPAQ
    • H3860iPAQ
    • H3870iPAQ
    • H3875iPAQ
    • H3900iPAQ
    • H3950iPAQ
    • H3955iPAQ
    • H3970iPAQ
    • H3975
Répondu ! Afficher la réponse J'ai le même problème

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Solution retenue

I made it my own way 😂. Since those batteries are nowhere to be found in the entire world - nothing to mention my homeland Ukraine - and even if you find it in another country - delivery would cost almost as much as the battery and most countries would not be allowed to send batteries in here - I decided to just find a similar battery and make a new one 🙌🏻.

The original battery is around 85 mm x 58 mm x 4 mm - and you should not go any bigger or especially thicker because it will put pressure onto the screen from behind - trust me, I tried 😝. And the original battery is 3.7V 1600 mAh.

I managed to find a new battery that has a little smaller footprint and has a capacity of 2100 mAh - definitely better than my 20+ years old battery anyway. Here they are next to my iPaq H3835 - the first one in the lineup that didn't even have bluetooth 😎:

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So I just carefully desoldered an old battery from a BMS board and then soldered a new one instead.

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Here it is connected to the device:

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And the device successfully booted with a new battery

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But there are a few more important things:

1) if your new battery is 4mm - try to put a battery management system PCB next to the battery and not on top of it to make the whole construction as thin as possible

2) battery terminals are way to flimsy and easy to break, but can be soldered no problem with a good flux

3) probably the most important: at first my new battery didnt want to charge and was not really recognized by the device:

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So I had to open the device and connect it directly to the bench power supply set up at 5V 2A for like 5-10 minutes. After that I plugged it back into the device and it got immediately recognized:

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Hope that helps many other retro gadget enthusiasts out there 🙌🏻

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Hi @alexanderre

Searching for part # 233488-001 found this webpage which shows that it is suitable for a HP-3835. The part number is also shown down in the "Compatible with" section lower down on the page.

The part number of the battery on the above page i.e PDAB-263987-001 found lots of suppliers. Here is just one to give an idea of the cost. They also state that it is for a HP-3835.

Just some options to try.

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Hi, thanks a lot for that 🙏 I also found a list of probably similar batteries from different manufacturers, sadly I'am yet to find a seller who has them in stock, preferably in the US or Europe 😞

par

@alexanderre

The one I linked is in the USA and has it in stock according to the webpage.

par

managed to open it through vpn - won't load otherwise, thanks, will try ordering the battery there 🙏

par

Did you order a battery? I am in need of one as well but wanted to see if you were able to get one. TY

par

Sorry for a late reply - nope, not yet, it's on hold for me as of now. Let me know if you've managed to get one. For me it's complicated because of batteries are not welcome for overseas shipping and I need it to fly to Ukraine

par

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@oldturkey03 I have thought of that but I wasn’t sure if it was possible. The dimensions of the original battery are: 3.36 x 2.05 x 0.11

I am including a few pictures of the battery connector still connected to the motherboard of my PDA. If these pictures aren’t good enough let me know and I will remove the battery and take better pictures. Thanks!

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@qd25kkfyioljzkq perfect! let's see what we can come up with.

par

Oh! Awesome! I definitely am willing to pay for you/you guys help! Just let me know! I seriously hate looking at my sad, dead iPaq.. 😂

par

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Hi gang, any update to this thread?

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@bobc90565 2 dead IPAQ's later and no change. Not giving up on things yet. No schematics, no diagrams makes things all the more difficult.

par

Thank you. I am not giving up either but have hit dead end after dead end.

par

I finally revived my Pocket PC and if anyone have valid replacement batteries anywhere in the US or Europe - please share, it’d be much appreciated

par

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in_sympathy sera éternellement reconnaissant.
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