What is battery C rate?
C = equal to (full) capacity. If the capacity of the battery is 2000 mAh and you charge at 1C it will be 1* the capacity of 2000= 2000mA. This means the charge will take 1 hour to charge the battery. If you see a .5C it means half of the capacity so in this case the half of 2000 = 1000. So at half the charge rate, it`s taking 2 hours to fill.
Another way to remember it is to say, 0.5C is 0.5 times the capacity. 0.1C is 0.1 times the capacity.
A little help: Try to see 1C as 100% charge current.
0.5C is going to be 50% = 2 hours
0.2C is going to be 20% = 5 hours
0.1C is going to be 10% = 10 hours
0.05C is going to be 5% = 20 hours
The recommended C-rate for Eneloops is .5C to 1C. This means a charge current of 1000-2000mA for normal Eneloop AA batteries.
More questions about charging (Eneloop) batteries
+ Is slow charging better than fast charging for Eneloops?
+ What do mA and mAh stand for? And what’s the difference?
+ How many times can Eneloop rechargeable batteries be recharged?
+ Do Eneloop batteries need a special charger?
+ How long do Eneloop batteries hold a charge?
+ What is the recommended charge current for Eneloops?
+ What’s the best Eneloop charger?
+ Eneloop Voltage – what’s the deal
+ Can you overcharge Eneloop batteries?
+ What is the maximum charge voltage for Eneloops?
+ Do I need to charge my new Eneloop batteries before I start using them?
+ Should I discharge my Eneloops completely before charging them?
+ How long does it take for Eneloop to charge?
+ How do I need to Refresh my Eneloops?
+ Can I refresh Eneloops if I don’t have a charger with a refresh option?
+ How many years do Eneloops last?
Advanced Eneloop charging info
+ What is -dV/dt charging? (termination)
+ What is 0 dV/dt termination?
+ How are Eneloops tested to claim a 2100 cycle life? (IEC 61951/ JIS 8708)
+ Non-charge related questions can be found in the Eneloop FAQ