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 Battery Charger,2A/8A/15A Car Battery Charger,6V/12V Fully Automatic Smart Battery Maintainer with Winter Mode, Auto Desulfator, Battery Recondition, for All Lead-Acid and LiFePO4 Batteries

Ampeak Battery Charger,2A/8A/15A Car Battery Charger,6V/12V Fully Automatic Smart Battery Maintainer with Winter Mode, Auto Desulfator, Battery Recondition, for All Lead-Acid and LiFePO4 Batteries

Product ID: 72223167

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Details

Brand
Ampeak
Color
15A
Product Dimensions
5.29"D x x
Item Weight
1.1 Kilograms
Output Voltage
12 Volts

⚡15A rapid charge power

🔋8-stage smart battery care

❄️Winter Mode for cold climates

Description

🔌 Charge smarter, drive stronger — never get stranded again!

WINTER MODE READY - Keep your battery healthy and reliable even in freezing temperatures
FAST FULLY AUTOMATIC - Choose from 2A, 8A, or 15A charging rates with effortless plug-and-play operation
MULTI SAFETY PROTECTION - Overvoltage, short circuit, reverse polarity safeguards for worry-free charging
PRECISION 8 STAGE CHARGING - Maximize battery lifespan with smart, damage-free power management
VERSATILE BATTERY COMPATIBILITY - Supports 6V/12V lead-acid & LiFePO4 batteries including GEL, AGM, and STD types

The Ampeak Battery Charger is a fully automatic, microprocessor-controlled device offering an 8-stage charging program that extends battery life and prevents damage. It supports 6V and 12V lead-acid and LiFePO4 batteries with selectable 2A, 8A, and 15A charging rates. Featuring Winter Mode for cold weather, multi-safety protections, and a fast 3-hour charge time, it ensures reliable, efficient battery maintenance year-round.

Specifications

Battery Charge Time	3 Hours
Current Rating	15 Amps
Input Voltage	120 Volts (AC)
Output Voltage	120 Volts
Item Weight	1.1 Kilograms
Item Dimensions D x W x H	5.29"D x 9.76"W x 3.91"H
Color	15A

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