4000 Series batteries have a 24-month free replacement warranty, after which an 84-month partial refund calculated from the date of use kicks in.
- Thick plates with the highest density of active material
- Wrapped dividers
- More room for liquid
- Unmatched number of charge-discharge cycles, 7-year warranty – 10-year average life
- Elimination of the sediment chamber allows larger plates to be used for the same cell size, resulting in a larger capacity battery
- Requires little maintenance