For example. Take a late model Softail/Dyna battery. The stock battery is rated at 310 CCA. CCA being cold cranking amps. WalMart sells a lawnmower battery that will fit. It is the same outer dimensions as the stock battery. It even looks like it might be made by the same manufacturer. But the CCA is only 270. It will start a bike a few times. But not enough juice to last very long. Check the CCA rating. It needs to be the same as stock.
Also stay away from conventional batteries. The fumes from conventional batteries is corrosive. It will corrode wiring and steel. Stick to absorbed glass-mat or gel cell batteries. If you want to get the most out of your batteries use a battery tender/trickle charger. They can be had at most auto parts stores for around $40.
There are some high performance lithium-ion batteries coming on the market. They have a CCA higher than stock. This is good news for those of you who have high compression motors and need a little extra juice.
--Aaron
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