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 Datasheet MSDS Specifications Packaged Volume : 0.48l Packaged Weight : 2.52kg Packaged Length : 15.9cm Packaged Width : 7.3cm Packaged Height : 4.1cm Length : 150mm Width : 65mm Height : 93mm DC Voltage : 12V Battery usage : Rechargeable Battery Chemical Composition : Sealed Lead Acid (SLA) Battery Peak Current : 130A Amp Hour Rating : 9Ah 20 Hour Capacity : 9Ah 10 Hour Capacity : 8.1Ah 5 Hour Capacity : 7.2Ah 1 Hour Capacity : 5.4Ah Connection Type : Spade Terminals Type of battery : SLA Block Recharging Voltage : 13.5V, 14.7V Standard Recharge Current : 900mA Recharging Time : 12hr