A28 is a high quality battery from VARTA. The cold cranking current of the battery is 650 A. The dimensions of the product are 346 x 172 x 239 mm. You should use the dimensions of your old battery as a guide for your selection. Durable Wet technology for your vehicle The A28 has a capacity of 110 Ah. The higher the value, the more electrical charge can be stored in the battery. Wet batteries like the A28 are suitable for marine applications with starting needs. They offer reliable performance for heavy duty marine use. The technology of this battery supports starting and power requirements in marine environments. You should consider this when buying Before you buy, check that the circuit and polarity of your new battery are identical to the values of the old model. The circuit shows whether the positive pole is on the right or left of the battery. To determine this, position the battery so that the poles are facing you. With the A28, the circuit is 0, so the positive pole is on the right.