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Nicad and nimh charging specifics?
Hi I thought I would try a new subject. Could someone tell me standard
charging specifics for nicad or nimh batteries, trickle and/or otherwise? Also, is it possible to overcharge these batteries by trickle charging them? Thanks. |
#2
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Nicad and nimh charging specifics?
Hi Daniel,
Trickle Charging Constant current charge at 1/10 C for 12 to 14 hours. C = capacity of battery. For a 1500 mah battery you would charge at 150 ma for 12 to 14 hours. Yes you can over charge a battery at a trickle rate. After the battery reaches Full Charge the excess current will start cooking the battery. If the battery is getting hot, it's cooking. Peak Charging NiCad Constant Current charge at 1C until the charge voltage drops by 15 mv per cell. MiMh Constant Current charge at 1C until the charge voltage drops by 5 mv per cell. Some Peak Chargers monitor the battery heat for the reasons noted above. I suppose you could build a charger based on battery temperature rise. Jay -- .. ---------------------------------------------------------------------------- "I'm pullin' for you; we're all in this together", Red Green ---------------------------------------------------------------------------- .. .. "Daniel Morrow" wrote in message om... Hi I thought I would try a new subject. Could someone tell me standard charging specifics for nicad or nimh batteries, trickle and/or otherwise? Also, is it possible to overcharge these batteries by trickle charging them? Thanks. |
#3
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Nicad and nimh charging specifics?
Thanks happyhobit and Steve.
"happyhobit" wrote in message ... Hi Daniel, Trickle Charging Constant current charge at 1/10 C for 12 to 14 hours. C = capacity of battery. For a 1500 mah battery you would charge at 150 ma for 12 to 14 hours. Yes you can over charge a battery at a trickle rate. After the battery reaches Full Charge the excess current will start cooking the battery. If the battery is getting hot, it's cooking. Peak Charging NiCad Constant Current charge at 1C until the charge voltage drops by 15 mv per cell. MiMh Constant Current charge at 1C until the charge voltage drops by 5 mv per cell. Some Peak Chargers monitor the battery heat for the reasons noted above. I suppose you could build a charger based on battery temperature rise. Jay |
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