Battery Atlas

Starting (SLI) · AGM

OPTIMA REDTOP RT U 4,2

Manufacturer part number 804 250 000 888 2. Specifications as published by OPTIMA.

Documented

What are the specifications of the OPTIMA 804 250 000 888 2?

The OPTIMA REDTOP RT U 4,2 (part number 804 250 000 888 2) is a 12 V AGM battery (starting (sli)). The manufacturer rates it at 50 Ah, 815 A CCA (EN), 100 min reserve capacity. Published dimensions: 245 × 172 × 200 mm. Weight: 17.6 kg. Values taken from the manufacturer document cited below (checked 2026-11-08).

Voltage12V
Capacity50Ah
CCA815A · EN
Stored energy600Wh · V × Ah
Battery
804 250 000 888 2
BCI group
34/78
EN / DIN / JIS code
n/p
Reserve capacity
100 min
CA
n/p
Dimensions (L × W × H)
245 × 172 × 200 mm
9.65 × 6.77 × 7.87 in
Approx. weight
17.6 kg (38.8 lb)
Polarity
n/p
Terminal type
n/p

“n/p” = not published in the manufacturer document we cite. We never fill missing fields with assumptions.

Source and verification

Source
OPTIMA specification sheet (Johnson Controls / Clarios)
Source document
OPTIMA YellowTOP/RedTOP/BlueTOP specification sheet (Johnson Controls), footer code '12-08-21 15en'
Verified
Data notes (conflicts, conversions, missing fields)

EU-market part number from an older OPTIMA/Johnson Controls specification sheet (footer 12-08-21); current US products and part numbers may differ. Line described as starting battery. Dimensions: length_mm/width_mm = base values, height_mm = height including terminals; top cover L 254, W 175; height excl. terminals 173. Capacity labelled '(EN) Ah' with no discharge rate stated. CCA labelled '(EN) CCA'. Reserve capacity labelled '(BCI) Min'. Terminal type and polarity not stated. Sheet is an older Johnson Controls document (footer '12-08-21'); values identical in companion sheet https://uk.optimabatteries.com/download_file/view/7365/2086 (footer '12-08-21 00en'). US part number (e.g. 8002-002) not on this sheet. Technology: sheet cites SPIRALCELL construction and 'absorbent glass mat separator'.

This page describes the battery only. It does not state which vehicles it fits: check the vehicle manufacturer’s specification and the label of the battery fitted.

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