For those who want to learn way more than they ever knew existed about VRLA (Valve Regulated Lead Acid) batteries, a company called C&D Technologies has a "Resources Page" on their website where they have the following
Technical Bulletins as PDF files.
By extension you'll also learn a lot about agm, gel and regular flooded batteries. For the most authoritative source for your particular battery, the "good" manufacturers have technical bulletins and technical people you can talk to if you have questions or need to put technical information in perspective.
VRLA Batteries- 41-2128 Charging Regulated VRLA Batteries
- 41-2129 Constant Voltage Charger Selection for VRLA Batteries
- 41-2130 Recharging Time Determination for VRLA Batteries
- 41-2131 Charger Output AC Ripple and the affect on VRLA Batteries
- 41-6739 Gassing and Ventilation
- 41-7135 Capacity Testing VRLA Batteries (20 to 200 Ah Capacity)
- 41-7264 Integrity Testing
- 41-7271 Impedance and Conductance Test
- 41-7272 Self Discharge and Inventory Control
- 41-7327 VRLA Battery and their Application
- 41-7329 Life Expectancy and Temperature
- 41-7334 UPS Applications and VRLA Battery Sizing
- 41-7471 Operational Qualification and Warranty Registration Checklist
- 41-7546 10 Year VRLA Periodic Maintenance Instructions
- 41-7745 Lead Acid Battery Terminology Glossary
- 41-7944 Thermal Runaway In VRLA Batteries - Its Causes and Prevention
- 41-7952 Parallel Operations Lead Acid Batteries
- 41-7953 VRLA Batteries Electrolyte Freeze Protection
- 41-7954 VRLA Batteries Extended Run Time
- 41-7955 VRLA Batteries Engine Starting Applications
For those concerned with the causes and how to prevent thermal run away (aka blow the battery) you might find bulletin 41-7944 interesting.