On 1/6/2014 2:53 PM, Don wrote:
Ideally each battery would be charged individually, but that is
expensive and takes more space.
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. That's too bulky and expensive? Really?

Also, SLA batteries don't improve with age. If ever left discharged,
they go bad very quickly. A bad battery looks exactly the same as a
good one. Some of yours may need replacing.

Hint: Because the capacity of a battery decreases over time, one symptom
of a bad battery you might notice is that it takes a charge much quicker
than a good one.

Vaughn