Don't expect any of the devices or solutions out there to be a miracle worker. 2-3 years out of a set of batteries is normal now a days. There are so many factors that goes into how long a set of batteries last. Adding water and proper charging is only one small portion of the equation to battery life longevity. Having tires with improper inflation pressure can have a huge effect on how long your batteries last. Quality of battery is important too. If you think any device is going to add years to the life of your battery pack, you need to look elsewhere. How you use the cart also has a lot to do with how long your batteries last, and many times you cant compare battery life to how long your neighbors batteries have lasted as the carts may have been used differently. I'd say make sure you are doing everything right with your battery pack before looking for a magic device.
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