For example, a mobile X-ray machine uses ten 12V-17AH sealed
lead-acid batteries, each of which is about the size of a motorcycle
battery and each of which consists of six non-replaceable 2-volt cells.
Over time and/or use, some cells lose their ability to hold a charge,
and after enough cells have deteriorated such that the total voltage won't
operate the X-ray machine, the hospital replaces the ENTIRE BANK!
Furthermore, to try to ensure they will never fail in use, batteries
which power IV pumps and UPS's (Uninterruptible Power Supplies) are
replaced on a time-in-use basis even if they haven't yet failed.
For over 25 years, Mercy Hospital in Manhattan, KS, has given me their cast-off
batteries. Those which fail to remain above "nominal" voltage while
supplying a current more than the C20 rate (the battery's rated
ampere-hours divided by twenty) go to our local recycling center, while
those which pass are listed below and are given (FREE of charge, of
course) to users all over the nation (I once sent, via a HAM who was going
that way, ten 12V-28AH batteries all the way from here in mid-Kansas to
southern Florida for use during their hurricane season!)
Over the years, I've received all sorts of batteries, from monster 110-pound
12V-100AH batteries to 50-pound 120V-4AH batteries to ounce-size cells.
Most batteries are LEAD-ACID, but shrink-wrapped packs generally
contain Ni-Cd, Ni-MH, or Li-ion cells, and some are so
well encased that I don't know what they are! Once, long ago, I
received some "wet" Ni-Cd's (think potassium hydroxide instead of sulfuric
acid), and once I was given two humongous-big-and-heavy 5 KVA UPS's (the
entire Uninterruptible Power Supply INcluding the batteries);
these went to Kansas City and Nebraska for emergency repeater power!
Many of these batteries last for YEARS beyond their replacement date
(in 2007, for example, I finally recycled a 12V-17AH battery which HAMs had
used to provide emergency communication for the 1996 International Horse
Race), and some may die tomorrow! But since they are FREE,
you get what you pay for!
As of July, 2014, the following batteries are available
HOW AMP- APPROXIMATE SIZES
MANY VOLTS HRS (INCHES; see note) OTHER COMMENTS
---- ----- ---- -WIDE--DEEP--TALL----------------------------------------------
21 12 5 3.5 2.75 4.25 Click to see size and rating
3 12 3.4 2.75 5.25 2.5 Click to see size and rating
2 12 3 2.5 5.9 3.9 Click to see size and rating
1 12 2+ 1.4 7 3 WITH FUSE
1 12 2+ 1.4 7 3 Same as above, but no fuse.
5 8 2.7 1.4 5.25 2.75 IV-pump batteries replaced on a time-in-use
basis. They are much bigger than a nominally-9-volt
"transistor" battery, but they last a LONG time!-)
28 6 4.5 1.9 2.75 4.2 Click to see size and rating
1 6 2 Three D-size cylindrical Gates cells in triangular
pack, about 3.5" each side and about 3" high
4 12 28 6.5 5 7 Click to see sizeClick to see rating
NONE of the following are currently available
0 12 17 7.2 3 6.5
0 12 8-9 2.5 3.6 6
0 12 2.9 1.3 3.9 5.1 Two glued-together 6V in series
0 6 6 1.8 3.3 4.4
NOTES: AMP-HRS are taken from battery's labels, but these are USED batteries,
so their actual AMPERE-HOUR capacity's are undoubtedly a little lower!
APPROXIMATE_SIZES measurements were made with the terminals facing
up and close to me (except for batteries which have terminals on
diagonal corners!); WIDE is across the side facing me.
I also have lots of "bad" shrink-wrapped Ni-MH and Ni-Cd PACKS in several
cell sizes ("A", "Sub-C", etc.), but you can make good packs from them by
disassembling and rebuilding them into whatever size & rating you need.
OTHER BATTERY-ORIENTED PICTURES:
OVERcharged batteries (a 20-battery UPS failed!):
My battery-charging work-shop:
Work areaLoad Tester
If you have a use for one or more of the above, and if you'll promise to dispose
of it or them properly when it or they finally expire, then contact me by email
(W0PBV@ARRL.net) or phone (785-539-4448; Manhattan, KS).
It's "First come, first served", and you must come to my place to get them.
Some miscellaneous wires and connectors are also usually available.
Five boxes preserve our freedoms: soap, ballot,
witness, jury, and cartridge. PhD EE - Barbershop Tenor - Amateur Radio Operator (W0PBV)
NRA "Lifer" & Certified Rifle, Pistol, and Home-Firearm-Safety
Certified Instructor for Kansas CCH (Concealed-Carry Handgun) license
This page was last modified on Wednesday, 23 July, 2014.