[Elecraft] Charging gel cells for my K2 with regulated PS???

[Steve Kallal]

I hope this isn't off topic.
 
I bought an 18 AH gel cell for my K2 after the power went out last week.
Today I bought a charger from HRO that charges up to 750 mA, which will take
forever with an 18 AH battery. I've been told I can charge the battery with
my regulated power supply if I am careful to not overcharge it. How do I
know when it is close to fully charged? I plan to use the smaller charger to
keep the battery trickle charged with the lower current charger. I simply
want to get the battery charged faster.
 
The battery is far from dead, but the voltage to my K2 drops significantly
when the KPA100 option is used, even with a #12 power cord. I don't plan to
use very high power, maybe 30 watts or so.
 
73,

Steve N6VL