SUNER POWER 10W 12V Solar Battery Charger Maintainer, Built-in Smart MPPT Cha…
10W 12V Solar Battery Charger with MPPT Controller, Waterproof Panel Kit
As we all know, batteries naturally drain power and if allowed to go flat, may never regain their full power. The adjustable joint ball make it possible to adjust the angle of solar panel to get as much as sunshine, increase 2%-3%more power.