they are flawless and you can lose a ton of weight ! 50 lbs! we have used one for 5+ years in our F430 ! zero issues yes you need a c-TEK LITHIUm charger / maintainer but may not need it often .you folks w/ huge losses need to do a parasitic voltage draw test ( watch some on you tube ) get the $35 Bluetooth battery monitor it is quite usefulkl! instant battery condition on your smart phone
