On Tuesday, January 7, 2014 9:38:19 AM UTC-8, Soartech wrote:

The excellent Battery Tender Jr. is available for around $23.00. You
can put four of them on a cheap power strip to charge a bank of
batteries and you will have spent less than $100.00 to properly charge
each bank of your batteries.
For even less you can get a similar small battery charger at Harbor Freight.

They are $10 but are often on sale with a coupon for less.
http://www.harborfreight.com/automat...ger-42292.html

A good battery tester helps. I recently got one and discovered that the charger I bought when I got my glider 10 years ago only puts 6 Ah into my 10.5 Ah SLA batteries. A different charger gets them up to about 7-8 Ah for my load profile. I've been running tests on some 9 Ah LiFePo4 batteries as well - pretty impressive performance so far - better than the 10.5 Ah SLA. I'll share results after I've had a chance to test them in my fridge.

9B