When I first got my unit I was trying to come up with an inexpensive source for batteries. I settled on the Value Power group 26 from Walmart and for the first 11 months they worked out fine. In December the first set failed a day from being out of warranty. Walmart replaced them and I ran the generator with the new set until the amp meter was no longer indicating a charge. Here is March and they were dead again. I charged them overnight and they read on the high side of fair with the hydrometer. Reading a 5 volt draw with a Fluke and no amps so it doesn't seem to have a problem there. While charging I did disconnect the solar panel and charge controller. I don't think it was a problem but it wasn't putting anything out.
At any rate I apologise for endorsing these cheap batteries. Looks like I may be replacing them soon.
At any rate I apologise for endorsing these cheap batteries. Looks like I may be replacing them soon.