Will the charger work with batteries connected in parallel (eg. RV house batteries) without having to disconnect them?

This smart battery charger supports charging 12V lead-acid battery. It is not recommended to charge battery in parallel. Because the surge current is too large, the battery would be damaged.

Why does it say not to charge a dead battery in the warnings? Is that not what it’s meant for?

I have repaired several old, dead but otherwise non-defective batteries. I connect them and select Repair. After a few minutes it will stop and say battery fault however the battery will now should a few volts. I repeat this process until the voltage gets high enough and the repair continues, sometimes for 24 hours. When completed the battery starts my 1976 LC and continues to work well with normal use. Note, as a precaution I always do this outside away from the house. I also know that the battery is not internally damaged.

Charger says to connect cables when they are connected

This just happened to me too. It's because the charger cannot recognize it as a battery. Your battery is dead dead. It is a built in safety protocol. Fortunately it was my boat battery. I hooked it up to my car with jumpers for 10 minutes. I then i hooked up the charger. The charger immediately recognized the battery and started charging. Hope this helps!

does this work with optima yellow top battery

Yes. This smart battery charger supports charging all types of 12V lead-acid battery, including AGM, GEL and STD. After searching the optima yellow top battery on market, most of optima yellow top batteries are AGM, which can be charged by this smart battery charger.

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Ampeak 25A 12V Battery Charger and Trickle Charger, 2A/10A/25A Automatic Battery Maintainer with Winter Mode & Auto Desulfator for Car, Truck, Lead-Acid, LiFePO4 Batteries

Ampeak 25A 12V Battery Charger and Trickle Charger, 2A/10A/25A Automatic Battery Maintainer with Winter Mode & Auto Desulfator for Car, Truck, Lead-Acid, LiFePO4 Batteries

Product ID: 72223167

Details

Brand
Ampeak
Color
Orange
Output Voltage
12 Volts (DC)
Product Dimensions
8"D x 6"W x
Specification Met
ETL

⚡15A rapid charge power

🔋8-stage smart desulfation

❄️Winter mode for cold starts

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Description

⚡ Never get stranded again — power up smarter, faster, and safer!

ONE CHARGER MULTIPLE USES - Automatically adjusts 2A/8A/15A charge for 12V batteries across cars, boats, RVs, and motorcycles.
SAFE WORRY FREE OPERATION - ETL-certified with spark-proof and overcharge protection for months-long maintenance.
CONFIDENCE WITH EVERY CHARGE - Backed by 30-day returns and 18-month warranty with dedicated customer support.
REVIVE MAINTAIN LIKE A PRO - Smart 8-stage desulfator restores battery health and extends lifespan.
INSTANT COLD WEATHER RELIABILITY - Winter mode plus 100A engine start boost ensures no more dead batteries on freezing mornings.

The Ampeak 15A Car Battery Charger is a versatile, ETL-certified smart maintainer designed for 12V/6V lead-acid, LiFePO4, AGM, marine, and RV batteries. Featuring an 8-stage desulfation process, winter mode with 100A engine start boost, and automatic current adjustment, it ensures reliable battery health and instant cold-weather starts. With spark-proof safety and a robust warranty, it’s the ultimate all-in-one charger for professionals who demand peak performance and peace of mind.

Specifications

ASIN	B0F2H44XT7
Amperage	25 Amps
Battery Charge Time	3 Hours
Best Sellers Rank	#277,397 in Automotive ( See Top 100 in Automotive ) #875 in Battery Chargers
Brand	Ampeak
Color	Orange
Connector Type Used on Cable	Crocodile Clips, Ring Terminals
Current Rating	25 Amps
Customer Reviews	5.0 5.0 out of 5 stars (3)
Input Voltage	120 Volts
Item Dimensions D x W x H	8"D x 6"W x 6"H
Manufacturer	Ampeak
Output Voltage	12 Volts (DC)
Specification Met	ETL
Warranty Description	18 months

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