Here's a quick video on how how to test your lead acid deep cycle battery cells with a hydrometer. And a quick and safe way to fill your battery cells with distilled water.
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(Used in the video)
Battery Filler with Auto Shut Off and Drip-Free Valve -
https://amzn.to/3LKMay6

(Another type of battery filler)
Battery Filler Rubber Bulb -
https://amzn.to/3UBysS2

(Another type of battery filler)
Ez Battery Filler -
https://amzn.to/3LOeEHc

(Used in the video)
Glass Battery Hydrometer Tester -
https://amzn.to/3fnQ8AH

(Another type of hydrometer)
Battery Hydrometer -
https://amzn.to/3xW2BlA

(Another type of hydrometer)
Battery Hydrometer -
https://amzn.to/3Sedffo

Thexton THE115 Battery Tester -
https://amzn.to/3CmjDMa

Battery Terminal Protector, Enhances Battery Life, Prevents Corrosion-Related Leakage -
https://amzn.to/3xYyGsV

Battery Cleaner Industrial Grade Aerosol Can with Water Rinseable Formula that Helps Improve Battery Performance -
https://amzn.to/3RdX28F

The opinions expressed in our videos are our own or from a contributor. Before taking on any project or making a large purchase, we recommend you do your own research and consult a professional for advice. We are NOT liable for any damage to your RV or injury incurred as a result of following our tips, advice or instructions. We are not RV professionals or certified technicians. We are simply RV owners who work on our own RVs and have a desire to share what we learn with others. Be responsible and know your limits.