Battery requires charging regularly!.Do I need a new battery

The main hybrid battery used in the Toyota Prius hybrid, including the Prius Alpha, is a high-voltage nickel-metal hydride (NiMH) battery pack. Unlike regular maintenance that involves adding water, this battery pack does not require such maintenance. However, there is a smaller 12-volt auxiliary battery that is responsible for powering the accessories and starting the car, which may require maintenance.

Here are some steps to troubleshoot and address the issue:

• Check the Auxiliary Battery Health:
• Start by having the 12-volt auxiliary battery tested to ensure it's holding a charge and functioning properly. If the auxiliary battery is old or not holding a charge, it may need to be replaced.
• Inspect Battery Terminals:
• Ensure the battery terminals are clean and securely connected. Dirty or corroded terminals can prevent the battery from charging and delivering power.
• Charge the Auxiliary Battery:
• If the battery is low on charge, you can charge it using an appropriate battery charger. Make sure to follow the charger's instructions and safety precautions.
• Check Charging System:
• Ensure that the vehicle's charging system (alternator) is functioning correctly. If the alternator is not charging the auxiliary battery properly, it may need to be repaired or replaced.
• Consult a Professional:
• If the issue persists or if you're unsure about handling electrical components, it's best to consult a professional mechanic or a Toyota service center. They can diagnose the issue accurately and provide appropriate solutions.

Remember, the main hybrid battery (the one that powers the electric drive) in a Toyota Prius is sealed and does not require adding water. It's the 12-volt auxiliary battery that might need maintenance or replacement.

if a car battery turns slow, and is charged
the battery is bad. (eol end of life)
to prove that is easy,
charge the battery fully , then load test it (a tool)
all cars shop and most auto stores do the test or free (carried in)
or jumper cable start the car if this works the battery in car dead is bad. if not, the problem is more complex.

https://www.harborfreight.com/100a-612v-battery-load-tester-61747.html

Correct, two batteries. Once your vehicle is jumped and started, the alternator will charge all the batteries, so just take it for a 30 minute highway run. Your larger Hybrid battery bank should be fully charged by plugging it in.

https://www.caranddriver.com/research/a32768969/hybrid-battery/

All vehicle owners should have a 10 amp battery charger.
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Testing the electrical system for a parasitic drain on the battery , charging system testing , Main power cables from the battery to fuse boxes . Checking maxi fuse etc...
The BEST Way TO Perform Parasitic Draw Test
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Voltage Drop Test

you can upgrade your battery,i suggest that you do so. the more cold cranking amps on your battery the better.if theres an advance auto parts store near you they will have what you need and also install it for free. autozone does the same thing also. it's true when it gets cold it drags the charge down on a battery.a battery can check good in the summer and be bad in the winter.suggest that you have it changed out with new battery with 650 or 750 cold cranking amps. it will say so on the top of your new battery so don't be taken advantage of. thank you for choosing fixya.com oncallmech

Hi, the deep cycle battery is for the home part and should charge through the external connector port. The regular battery is for the engine. Is the regular battery charged up too?

Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

The cables are just for jump starting, you won`t be able to get a full charge that way.You will need to connect a battery charger to do it properly.If you don`t have a battery charger auto zone will charge it and test it for free if you remove it and take it to them.

the wire that tells it to excite is the battery wire to the alternator through the light bulb
not charging is a problem voltage regulator
while the alternator may be new if it requires an external regulator or internal regular is a problem

hahaha dead battery and after u replace it do a charge test (alt test) most small shops will do thid for a small price, some for free