Replacement 0810-0011 Cyclon battery - Page 1
Forum section: electronics / repair

author: Shimonu
author_rank: Regular Contributor
timestamp: July 14, 2025, 03:07:20 pm
content: I have a HP 3435A with the battery mentioned in the title that I would like to find a replacement for. I visited a local battery shop and the guy said these cyclon batteries are becoming quite rare and wasn't sure he'd be able to get it. Looking around online these seem to only be available in North America and the few that ship internationally have a shipping cost higher than the value of the battery.I've sent a couple of messages to online stores to see if they can get it but I'm not hoping for much.If I want to keep the meter original are my only options to take the cost or leave the old one in? I could of course imagine stuffing some other chemistry in the case but from what I understand I can't use the charger for the original battery so I'd have to bypass that and have another charger inside.

author: edpalmer42
author_rank: Super Contributor
timestamp: July 14, 2025, 04:51:13 pm
content: Open the plastic case that the batteries are in and replace the three Cyclon cells with a standard 6V SLA battery. That will retain both the look and the chemistry so the charger can remain intact as long as the capacity of the new battery is near the 2.5 AH value of the original.The Cyclon cells are very well sealed and under normal conditions won't outgass at all. An ordinary SLA, as the name states, is sealed, but it may occasionally vent. This could release acid vapor which could corrode parts of the meter over time. This feature of the Cyclon batteries could be one of the reasons that HP and others used them.You could also replace the battery with a 6V LiFePO4 battery. Get one that has a built-in BMS. These are rather expensive.

author: Ian.M
author_rank: Super Contributor
timestamp: July 14, 2025, 05:31:41 pm
content: This looks like a good candidate for a Cyclon replacement available in EU, but do check dimensions carefully.https://www.tme.eu/en/details/cyclon-d6/acid-cells/enersys/0819-0012/

author: edpalmer42
author_rank: Super Contributor
timestamp: July 14, 2025, 05:39:11 pm
content: For a bit more money you could buy 3 of these:https://www.tme.eu/en/details/cyclon-d/acid-cells/enersys/0810-0004/They should fit inside the existing case.

author: Shimonu
author_rank: Regular Contributor
timestamp: July 14, 2025, 06:25:06 pm
content: The triple cyclon one is unfortunately too big. The single unit however looks interesting, I'll have to check the dimensions which is probably correct.I could probably just link them together with spade terminals or is it safe to solder them together? Thanks, that's a great tip!

author: edpalmer42
author_rank: Super Contributor
timestamp: July 14, 2025, 07:02:21 pm
content: The attached brochure states that soldering is okay for D cells. You'd have to check and see if there's room for a spade connector inside the case. I have a unit that uses the 4-cell version of this and they spot-welded straps onto the terminals after they bent the terminals so they're parallel with the surface of the battery. When you open yours you'll probably see the same thing.Did you notice that TME doesn't have any of these in stock? But they have 139 coming in week 32 (middle of next month). I think they had something like 145 a couple of hours ago. I guess you can order them now with shipping when they arrive.

author: Shimonu
author_rank: Regular Contributor
timestamp: July 14, 2025, 09:11:07 pm
content: Quote from: edpalmer42 on July 14, 2025, 07:02:21 pmYeah, I don't feel like getting a spot welder just for this. I think it's available as a service but seems like a lot of work to send it away if I can solder it myself. A spade connector might be too big, I'll have to see what I can do.I was wondering if I had read the stock wrong, I though it looked like they had it but later it wasn't in stock. Maybe best to just order to make sure.