Optima Blue Top Battery - BT-DC5.5
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eBayOptima Blue Top Battery BT DCM 5.5 (8052-188) (BCI D31M) BTDCM5.5 AGM
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Blueperry agriculture (UK)Optima Blue Battery 12V 75Ah 975A Agm Top 852188
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Product Information
Full details
The Optima Blue Top battery BT-DC5.5 is designed for boat owners and RV enthusiasts who require a dual-purpose battery capable of delivering reliable starting power and sustained deep-cycle performance. Featuring advanced AGM (Absorbed Glass Mat) technology, this battery is built to withstand high-vibration marine and off-road environments; however, users should ensure their charging system is compatible with AGM charging profiles to maximize battery longevity.
All features
| Model Part Number | BT-DC5.5 |
|---|---|
| Brand | Optima |
Extended Product Information
FAQs
Is this battery considered deep cycle?
Yes, the Optima Blue Top BT-DC5.5 is a dual-purpose battery, meaning it functions as both a starting battery and a deep cycle battery.
Can I mount this battery on its side?
Yes, due to its sealed AGM construction, the battery can be mounted in virtually any position without risk of leaking.
What is the recommended charging voltage?
It is recommended to use a charger with an AGM-specific profile, typically peaking around 14.4V to 14.7V depending on ambient temperature.
Does this battery require water replenishment?
No, this is a sealed, maintenance-free battery and should never be opened or topped off with water.
Can I use this for automotive starting?
While it is optimized for marine and deep-cycle use, it can be used for automotive starting provided the physical dimensions and terminal layout fit your vehicle's tray.
Troubleshooting
Battery fails to crank the engine
Verify that terminals are clean and tight; check voltage using a multimeter to confirm if the battery is fully charged.
Battery will not hold a charge
Ensure the charging system is AGM-compliant and check for parasitic electrical loads that may be draining the battery while the vehicle is off.
Pros and Cons
Pros
- High vibration resistance for off-road or marine use
- Dual-purpose functionality saves space by replacing two separate batteries
- Maintenance-free sealed AGM design
- Excellent cold weather starting capabilities
Cons
- Requires specific AGM-compatible charging settings
- Heavier than traditional flooded lead-acid batteries
- Sensitive to deep discharge if left below voltage for extended periods
Setup, Compatibility & Care
Installation of the BT-DC5.5 is straightforward due to the diagonal terminal layout, but ensure your mounting hardware is clean and tightened to prevent movement. When charging, use a smart charger set to the 'AGM' or 'Gel' mode. Avoid using older, unregulated high-amperage chargers, as these can overheat the cells and shorten the lifespan. To maintain performance, store the battery in a cool, dry place and ensure it remains fully charged during off-season storage, ideally using a maintenance-level float charger.