Fantastic Thread, I am setting up to change the batteries 1 5603, plus 2 600 ATS units, I had already changed one set, before realizing that using a low profile on board mount, might be better, I just need to examine the output and do a dump, I ran into a small technical issue, I had no rs232 port on any working computer, so I ordered a cheap laptop off ebay. (when it came it also did not have the rs232 port) LOL, even though the listing said it did, (it was a VGA port, I tried to use a modified USB cable, but could not get any indication that there was any throughput, so I dusted off an ancient dell unit that was buried under a ton of other stuff in storage. Is there any specific indication that the unit has achieved a connection, (except for the pencil workaround) ? by the way really nice information, about the time this covad 19 stuff started a big company had an auction and no one came, all online, the auctioneer took one blurry picture, looked like junk in a container, I wanted the container, but turned out it was filled with mobile, construction equipment, GCS900, MS990, MS992, RTK (site vision) cab control systems, targets, MT900, plus a lot more, but I cant test out a lot of this stuff until I get one of these three machines to shoot a target so I can document that everything works. I am close to getting this done (finally after three months of constant research) so when I saw this topic, I realized that this could be the missing link to putting all this (stuff) together.
I will say that it is a little tricky getting these on the board, I also added a insulator, in front of those bats, to protect against contact inside the unit, as well as holding the batteries in place, in case of vibration. But having a backup in case of a future battery issue would be a wise thing.
Opened the ACU to check the batteries. They are 4x 5/4 AAA 800mAh. I guess standard NiMh AAA 800 mAh will do as replacement as the 5/4AAA are hard to come by, at least in Europe.
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I just ordered a battery pack for a trimble ACU, 57 there were four stacked batteries, if this is the same then you might try ordering a replacement, (only difference that I could tell was that, I do not think they have a heat sensor in there) "protection circuit" you can get those for cheap and just splice it in there if that is a concern.
I tried to find batteries, most did not have the required Mah, 4.8 volts 1000 Mah, very small storage area, it only fits in there one way, I did find the original battery but they wanted 10 to 12 usd per battery, so I found a place in HK, that sells the battery oem, for 39 plus shipping, https://kargo-tech.com/back-up-battery-replacement-for-trimble-acu-p-3878.html?zenid=95b746913552011fb4277679f59bd81e
There's a 5601 and an RMT for sale on eBay:
changed the batteries, but have not figured out how to reset the battery timer
I also managed to change the two batteries in the Control Unit (CU) but nag screen "change Battery" ist still there. I would be also interested how to reset the battery timer for CU and Station.