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If its 3-4 years old, replace just so you dont come out from work or where ever and when you push start you get nothing.
Some might say you can get more life out of them. I dont take that chance.

You could take into an auto parts store for a load test every year.
Its a free test to tell if the battery has the power to spin the engine.

There really is not a good way to tell if your battery is going bad.
It just slowly ages itself to no good.
 

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You could take into an auto parts store for a load test every year.
I suggest that a starting test for a car battery draws way too much power for a motorcycle battery. Take it to a motorcycle dealer for testing.
However I am reluctant to buy a new battery from a motorcycle dealer because it may have been sitting around on the shelf for half of forever.

I use 5 years as a guide for life of car and motorcycle batteries. This assumes they have been kept well charged, not allowed to run down and left to sit that way for days.
 

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Buy a good Lithium Ion Battery and forget about the charging task. They are far superior to the 100-year-old heavy lead acid batteries. I have an AntiGravity LI battery that has a dedicated cell to hotshot the battery if I leave the ignition or the lights on and it only weighs about 2 pounds.
 

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Buy a good Lithium Ion Battery and forget about the charging task. They are far superior to the 100-year-old heavy lead acid batteries. I have an AntiGravity LI battery that has a dedicated cell to hotshot the battery if I leave the ignition or the lights on and it only weighs about 2 pounds.
What Toslo said. I used a Battery Tender on my original battery, but when it was 3 years old it was testing a bit low on my load tester so I recycled it and put in an Anti-Gravity battery with restart capability. Pricey, but also 1/3 the weight of the usual lead acid batteries. The only weakness I know of with lithium batteries is that they can produce insufficient starting voltage in cold weather. The suggested cure for this is to turn on the ignition and let the headlamp current need heat up the battery, in which case it should start fine. Perhaps others can confirm or expand on this. I'm in an area not given to terribly cold weather so have not experienced a no-crank situation.

Ralph
 

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#9 · 3 h ago

Buy a good Lithium Ion Battery and forget about the charging task. They are far superior to the 100-year-old heavy lead acid batteries. I have an AntiGravity LI battery that has a dedicated cell to hotshot the battery if I leave the ignition or the lights on and it only weighs about 2 pounds.

Purchased same battery, replaced 5 year old original
 

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Was going to go down the Li route, but my battery is still ok. Apparently if you use the bike in really cold weather and the Li battery is not up to it's working volts then over time It can give the starter clutch a hard time, plus I would need a different charger as I like to leave a tender on. I am pleased you guys with Li battery's have had no issues though. P.S we have had a case over here with a Li battery catching fire when being on charge in the house.
 

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Was going to go down the Li route, but my battery is still ok. Apparently if you use the bike in really cold weather and the Li battery is not up to it's working volts then over time It can give the starter clutch a hard time, plus I would need a different charger as I like to leave a tender on. I am pleased you guys with Li battery's have had no issues though. P.S we have had a case over here with a Li battery catching fire when being on charge in the house.
Understand your concerns. the battery I purchased arrived fully charge. i have never had to charge it. is capable of sitting idle in the winter cold for weeks on end and still starts bike in a split second.
 
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