Battery Types


  • Why do sealed batteries cost more? Why are there different battery types? What is the difference between a sealed battery and an unsealed battery type? {John Jr, UT 1985 CB125 broken}


Motorcycle batteries come in 2 types, Sealed or Gel and Vent or Flooded. There is no such term as an "unsealed" battery. Really, they are all un-sealed. If they were truly sealed, they would explode.

The older type is the vented or flooded. They are sold in a kit. You have to open the filler caps on the battery & pour in battery acid, then charge it. They have a vent tube to let the acid vapor, that is created when the battery makes electrical current, out. If it did not vent, it would explode from the build up of pressure.

Older bikers will tell you to check your battery level & put in some water if it is low. That's why older bikes with liquid lead-acid batteries when stored outside or in a barn during the winter, will have cracked batteries. The water inside freezes.

The newer type is a sealed or gel battery. They are not truly sealed, they have a valve that lets vapors out if the pressure inside requires it. No vent tube. The reason they are called sealed is because you (or the shop) no longer have to fill them with acid when purchased. The acid is already inside, in a gel form. It's like acid Jello.


Some gel batteries are still shipped dry.  A shop or dealer must fill them with gel for you.  Read the product information carefully before you purchase. 

They are safer than the flooded type. If you knock it over you are much less likely to have anything spill out. They are also smaller and lighter. This means they can be installed in a smaller, not necessarily upright space.

Example & Advantages

Weeks always recommends Yuasa batteries. We have experienced the least amount of trouble with them. They will start your machine year after year. We feel that over time, spending a little more on a Yuasa will pay you back in the form of not stranding you on the side of the road somewhere.

Private branded batteries are almost always a rip off. There is absolutely no need for anyone to buy a Harley battery for their Harley unless they what to pay extra for a logo.

Your CB125 uses a Yuasa YB2.5L-C battery. That's a YuMicron, vented, liquid acid type. At this time, there is no equivalent in a Yuasa Maintenance Free, Sealed Gel battery.

Let's use a 1986 Honda VT1100C V65 Magna as an example. It uses a traditional, vented, lead-acid YuMicron battery, number YB18-A. If you wanted to get a new, sealed Maintenance Free Yuasa battery instead, it would be number YTX20-BS. It weighs a little more, but is smaller and costs more. The difference in cost is about $25.

Is it worth $25 to you for a sealed gel battery? It is up to you. They last just as long. You never have to check the acid level or add water. The manufacturers also say that they retain more of a charge over longer periods of storage than the vented type.

Check out Yuasa Yumicron Battery on Chaparral's site.

Yuasa Yumicron Battery

Need more free ATV or motorcycle repair information?

Q&A:  Leaking Fuel Valve?
Q&A:  Leaking Gas Valve flooding engine?
Q&A:  Battery Maintenance
Q&A:  Battery Types
Q&A:  Carb Jetting page 1
Q&A:  Carb Jetting page 2
Q&A:  Aftermarket Exhaust System
Q&A:  Carb Float Needle
Q&A:  Carburetor Identification

Q&A:  Honda Points
Q&A:  Rim Bolt Pattern
Q&A:  CB750F Identification
Q&A: Broken Speedometer Cable End
Q&A: Suzuki LT-Z400 QuadSport Tank Removal
Q&A: Motorcycle Trike Conversion
Q&A: Honda Rancher Reverse Problem
Q&A: Kawasaki Z650SR Fuel Mix problem
Q&A: RM80 Piston Position

Q&A: LT80 Engine Oil Issues
Q&A: Clutch Cable Break In period?
Q&A: Cooling Fan Problem?
Q&A: 1983 XV920 Virago Oil Change
Q&A: ATC90 Spark Plug question
Q&A: Nighthawk 750 Spark Plug Gap
Q&A: Bike Registration Problem
Q&A: Lost Hypercharger Instructions
Q&A: Bourget Charging System

Q&A: Can Spark Plugs be cleaned?
Q&A: Wheel Bearing Removal for 1976 CB750K
Q&A: 1982 YZ490 Kick Start
Q&A: 1979 GL1000 Goldwing Points Gap
Q&A: 1982 GS650GLZ Cable Routing Problem
Q&A:  Ether vs. Carb Clean
Q&A:  ATV Ignition Trouble
Q&A:  John Deere backfiring
Q&A:  Honda Phantom 200 Tire Pressure

Q&A:  TRX350 Clutch Slip possible causes
Q&A:  LTF250 Cam Chain Installation & Timing Marks
Q&A:  Demon X pit bike clutch trouble
Q&A:  OK to Increase Tire Size?
Q&A:  RV125 Lost Keys
Q&A:   1981 GPZ550 flywheel cover
Q&A:   2000 Yamaha Badger : Hard to start
Q&A:   1975 CB360T Replacement Tire
Q&A:   Vintage CB750 Chain Size

Q&A:  LTA500F Vinson Leaky Fuel Petcock

Motorcycle Batteries Free Shipping

Go to Motorcycle Salvage

Weeks Motorcycle Home

Website upgrade in progress

Ask a Repair Question

Search Our Site
Custom Search


Vote for our site on Webbie World!

Weeks Cycle Salvage
eBay Store

Show Off Your Machine!

Show Off Your Machine

Weeks Gear
coming soon!

Sale Banner at Adventure

Discount OEM Parts

Classified Listings

Review on

Site Build It Affiliate Program