FOVAL
An RV converter changes 120V campground power into 12V power for lights and pumps and charges the house battery. If your current converter works and suits your batteries, you do not need a new one.
RV owners replacing a failed converter or changing battery type.
Size given in the listing: 2.4 x 1.25 inches. Confirm on the Amazon listing before you buy.
It names a warranty of 18-month. Check the listing for the terms.
The title gives a pack size of 2. Confirm on the Amazon listing.
[2-Pack] FOVAL Fully Automatic Trickle Charger, 1000mA 12V Smart car Battery Charger, Battery Maintainer, Float Charger for Motorcycle Car Lawn Mower Boat SLA ATV Wet Gel Cell Lead Acid Batteries (ASIN B082VQJQJP). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B082VQJQJP).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.