Took a dive into reading battery warranties. Odyssey has a lot of exclusions.
Odyssey Warranty Exclusions (selected, not all)
1. The warranty does not cover a Battery reaching its normal end of life, which may occur prior to the warranty periods stated above. Depending on the application, a Battery can reach its normal end of life before the end of the Applicable Warranty Period. A Battery can deliver only a fixed number of usable amp-hours over its lifetime and is considered to have reached its normal end of life if the application uses up all of these amp-hours, regardless of the time the Battery has been in service. Therefore, Manufacturer reserves the right to deny a warranty claim if it determines the Battery to be at its normal end of life, even if the claim is filed within the Applicable Warranty Period.
2. Prolonged storage (>14 days) of vehicles with fuel injection computers, alarms, GPS and other electrical devices that require continuous battery power to support active memories; this power drain must be offset with a maintenance-float charger, periodic charging or disconnecting the Battery to prevent irreversible damage to the Battery plates.
There are a lot of other less relevant exclusions from Odyssey. Compare this to Dekka's warranty:
Dekka's Warranty
This warranty does not apply to discharged batteries that can be recharged and returned to service...; batteries that fail as a result of a faulty electrical system or other components; ...
Glad I went with a Dekka. Basically, if the battery cannot be recharged, they will replace it. Seems very reasonable to me.
Odyssey Warranty Exclusions (selected, not all)
1. The warranty does not cover a Battery reaching its normal end of life, which may occur prior to the warranty periods stated above. Depending on the application, a Battery can reach its normal end of life before the end of the Applicable Warranty Period. A Battery can deliver only a fixed number of usable amp-hours over its lifetime and is considered to have reached its normal end of life if the application uses up all of these amp-hours, regardless of the time the Battery has been in service. Therefore, Manufacturer reserves the right to deny a warranty claim if it determines the Battery to be at its normal end of life, even if the claim is filed within the Applicable Warranty Period.
2. Prolonged storage (>14 days) of vehicles with fuel injection computers, alarms, GPS and other electrical devices that require continuous battery power to support active memories; this power drain must be offset with a maintenance-float charger, periodic charging or disconnecting the Battery to prevent irreversible damage to the Battery plates.
There are a lot of other less relevant exclusions from Odyssey. Compare this to Dekka's warranty:
Dekka's Warranty
This warranty does not apply to discharged batteries that can be recharged and returned to service...; batteries that fail as a result of a faulty electrical system or other components; ...
Glad I went with a Dekka. Basically, if the battery cannot be recharged, they will replace it. Seems very reasonable to me.