Regarding to the question of C10 and C20 difference on batteries :
First we need know that: one battey with small current will release more energy. (Because Large current will cause more amount of heat).
At the beginning, VRla batteries are used for UPS etc. backup System, and the battery is test the capacity @C10(10hrs) ,excepet small capacity batteries (4aH - 18AH). (need out put engery in short time))
Then the battery VRLA battey widely used for solar powe system, marine, RV , glof cart etc.. ( out put engery in long time, maybe one of two days)
After that, lots of batteries are offered based on capacity test at @C20(20hrs).
1. - Same capacity, 10HR 20HR, which one is better?
- 10hours rate is better. and cost will high arround 3-5%.
Explanation: for example.
100ah 10hr need 10hours to finish discharge 100amp with 0.1C constant discharge current.
100ah 20hr need 20hours to finish discharge 100amp with 0.05C constant discharge current.
so if you need get the request capacity in short time, 10hr battery is little better.
but if not have special request on time, then both is ok for use, they are all popular to sell among our clients.
2. In the market, 12V100,12V150,12V200,12V300Ah C10 and C20 are both popular.
Any query, or need to know more information on the batteries, please feel free to reach me.