rspickel Report post Posted February 28, 2024 I have a battery question relative to my house batteries that need to be replaced. I currently have 2 12v Lead Acid batteries. It is difficult to service them because of how they are situated in my coach so I'm thinking about changing. I think I read somewhere that changing to Lithium batteries could be a problem and I'm not really wanting to spend that much money. Are there issues with moving to AGM Batteries? Are there any issues with moving to a single 200 Ah AGM battery rather than purchasing 2 100Ah batteries. I'm pretty sure that I know the answers to these questions but want to be sure before spending the money. Share this post Link to post Share on other sites
wildebill308 Report post Posted March 1, 2024 But how do they compare in storage capacity? Bill Share this post Link to post Share on other sites
superbus Report post Posted March 2, 2024 (edited) I recently went through this exercise of deciding which type of batteries to replace my poorly maintained flooded lead acids (that one was on me). At least for my configuration, price doubled for each move "up" from flooded lead acid, AGM, and finally to lithium (even if looking at halving the number of batteries). In the end, I decided on AGMs as I did not need to change any part of the inverter/charger system, they don't require nearly as much maintenance as FLA, the added vibration resistance, and the fact there is a big diesel generator in the front of the coach to keep them charged up. That last part is a big factor, as it negates a lot of the concerns. Edited March 2, 2024 by superbus Share this post Link to post Share on other sites
RRR Report post Posted March 6, 2024 If you mean poorly maintained as not keeping the cells refreshed with water add a battery watering system. Simple to use. https://www.flow-rite.com/product/qwik-fill-on-board-battery-watering-system/ also on Amazon and I have seen at local auto part store. Gang them together and you have one fill point, unlike my dealer who couldn't figure that out. There is others out there too. Share this post Link to post Share on other sites
sfroese Report post Posted April 2, 2024 Just a note, although a DC-DC charger is the best option, you don't need one. You can also use a Li-BIM isolator. Much easier to wire up. Also, the cost of ownership of LiOn over the cost of their lifetime is much lower than the alternatives, and the power vs. weight is much more favorable, as LiOn are roughly half the weight per Ah as lead-acid. Lots of advantages vs. a few disadvantages. I just upgraded to LiOn while camping last week. Took me about an hour, although it could take longer, depending on what charging and isolating technology you use. your friendly neighborhood moderator Share this post Link to post Share on other sites
jklbus01 Report post Posted Thursday at 01:34 PM I switched out my two coach batteries for the same reason. They were located under the steps and difficult to maintain. I switched to AGM batteries and they worked for the two years I had the rig. Share this post Link to post Share on other sites