Yup, them good ‘ole days are gone. We had to close our 17-person Battery Maintenance Department a couple of years ago, now there’s just me, a battery-lifting beam, one hydrometer, a funnel, and an eye dropper.
You are missing the legacy "syringe" to suck electrolyte out as well as introduce it for exchange and balancing?
"https://www.autozone.com/test-scan-and-specialty-tools/battery-acid-filler"
Time was, Telco's had all sort of "stuff" and trained staff. we could rebuild our own batteries on-site, had ongoing regular maintenance programs. You'd have had to be a Diesel-Electric submarine (life and death critical) or a B-26 bomber maintenance guru (crucial electric prop-pitch issues), to have had any more intense an interest.
One visit to the data centre we had our racks in, Hong Kong, mebbe ten years ago, a new partition had gone up. Other side of it? Row after row of basic commodity mass-market Marine/RV batteries. "Disposables" IOW.
Wasn't long before one of the FM staff executed an UPS cutover BACKWARDS, dropping 3 servers - all well past 900-day uptime - out of any chance at reaching record status (7+ years for BSD Unix..).
Hong Kong' major banks, finance houses, IS/IT, and Government agencies were a great DEAL more pissed-off than we small potato operators though!
New China News Agency - who manage to put a server on every backbone they can ID, *anywhere*, prolly though it was a deliberate Honkers PLOT!
It's a nuisance messing with all this. Clearly no longer worth it on inexpensive auto/truck/marine/RV sizes.
I'd still class it worthwhile on the battery you are dealing with though.
A NEW one costs how much again?