can i leave this on my harley all winter ?

I use the Battery Tender® Plus 12V, 1.25 Amp on my motorcycle and the Battery Tender 6V/12V, 4 Amp Lead Acid & Lithium Selectable Battery Charger on my Car. I leave them on both vehicles for extended amounts of time during the cold months.

Can i leave this on while im out of town for a month?

By all means. This device is intended to be connected for continuous operation (except for driving of course - be careful to unhook before getting in your vehicle. The design has a microprocessor that senses battery storage and will adjust the trickle to keep it at 100% (but not overcharging). In fact, you should not disconnect it for any reason unless driving the vehicle. I have a lawn tractor that only receives sporadic use. My zero turn does most of the lawn mowing. In any event, I keep both of these machines on a Deltran dual bank tender. Their batteries are several years old which is unusual for a lawn mower. (Typically, they fail shortly after the 12 Mo warranty.) Leave it on to do its job. Keep in mind that most vehicles (cars & trucks) draw a small amount of amperage while sitting - security system & clock. The tender will compensate for this discharge. Hope this helps.

Does this unit detect cold weather and charge to help prevent battery freezing ?

It does not detect cold weather. If it is on the battery and maintaining the voltage, the battery is less likely to freeze.

will it charge lead acid batteries?

Absolutely, all mine are of that type.

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🔌 Stay Powered, Stay Ahead — Never Let Your Battery Hold You Back!

PLUG FORGET CONVENIENCE - Compact, lightweight design with 11 feet of combined cable reach for easy setup and low-maintenance operation.
SMART 4 AMP CHARGING POWER - Delivers a full charge then seamlessly switches to float mode to maintain optimal battery health without overcharging.
INTELLIGENT SAFETY FEATURES - Spark-proof connection and reverse polarity detection ensure safe, worry-free charging every time.
REAL TIME BATTERY MONITORING - Two-color LED status indicator and ISM adaptive charging technology keep your battery in peak condition automatically.
UNIVERSAL 6 V 12 V COMPATIBILITY - Effortlessly charges lithium, lead-acid, AGM, and gel cell batteries for cars, SUVs, trucks, and motorcycles.

The Battery Tender 4 Amp Charger is a fully automatic, smart battery maintainer designed for 6V and 12V lithium and lead-acid batteries. Featuring adaptive ISM technology, reverse polarity protection, and spark-proof operation, it ensures safe, efficient charging and long-term battery health. Compact and easy to use, it’s perfect for professionals who demand reliable power for cars, SUVs, trucks, and motorcycles.

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Manufacturer	12V
Brand	Battery Tender
Model	12V 022-0209-BT-WH
Product Dimensions	17.53 x 8.46 x 4.85 cm; 1.09 kg
Item model number	022-0209-BT-WH
Exterior	Painted
Manufacturer Part Number	022-0209-BT-WH
Item Weight	1.09 Kilograms

Battery Tender 4 Amp Battery Charger & Maintainer - 12V or 6V Fully Automatic Lithium Acid Smart Lead Battery Charger for Cars, SUVs, and Trucks

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