Let me teach you how to find our the answer on your own. It's useful to know this as this applies to other parts, ie spark plugs, oil filter, etc.
1. Google what battery models are used on both bikes using a reputable brand. Google a few sources to be sure.
- E.g. Yuasa
- E.g. http://mototh.com/en/page/2551
Answer - CBR150 = YTZ6V, CBR125 = YTZ6V, YTZ6S-BS
Most of the time you will find at least 2 models of the same brand for your bike. The common diff is probably one is maintenance free, the other is not.
1. Read the service manual of the bike of your interest. Note its charging system. Find the right spec for your battery.
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