Mastervolt 64000250 MVG Gel Battery 12/25Ah

In Gel batteries, the electrolyte is absorbed by a Gel. This type of battery is entirely maintenance-free and has no gas formation with normal use.
As no extra ventilation is required, Gel batteries can be installed anywhere. They are ideal as service battery and for cyclical use, and can be charged very quickly.
Perfect service battery for medium sized and large 12 V and 24 V systems.
Extremely long lifespan.
No gas formation with normal use.
Fast recharge, high charge current possible.
For intensive cycle use with a high number of charge/discharge cycles.
Very low self-discharge.
High return on investment.
Two year warranty.