These are small Sealed Lead Acid batteries that are generally used for semi-portable appliances that need more power or a fair bit of power (more than can be provided by D, C or AA cells) for a longish time. They are typically used for people who go caving, or for lighting for an overnight camping trip where you are travelling on foot. They are not ridiculously heavy or bulky. They are good to drive a lantern on a tinny for that night fishing expedition. Being sealed, you cannot fear that the battery acid (which is actually a GEL) will spill.
The amp-hour rating tells you how long the battery will last before it goes flat. For example, a 7.2Ah battery will give 7.2 amps for one hour or 3.6 amps for 2 hours or 1.8 amps for 4 hours, etc. Generally an adequate amount of current for a lantern.
They are ideally charged by solar panels.
Leak proof construction
Usable and rechargeable in any position
Capable of high discharge rates
Deep discharge recovery
Wide range of operating temperatures
Long service life
Specifications
Length : 150mm
Width : 100mm
Height : 93mm
DC Voltage : 12V
Battery usage : Rechargeable
Battery Chemical Composition : Sealed Lead Acid (SLA)
Battery Peak Current : 60A
Amp Hour Rating : 12Ah
20 Hour Capacity : 12Ah
10 Hour Capacity : 10.8Ah
5 Hour Capacity : 9.6Ah
1 Hour Capacity : 7.2Ah
Connection Type : Spade Terminals
Type of battery : SLA Block
Recharging Voltage : 14.4V, 15V
Standard Recharge Current : 3.6A
Recharging Time : 12hr