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Oct 01, 2019, 03:13 PM
A Day @ a Time - Matt. 6:25-34
ruff1's Avatar
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Question

NIMH Charge Rate?


Been working with an 18V 1500 mah pack. I did some research, and found charge rates ranging from 0.1C to 1C. I initially used 1 amp (.66C) pack was barely warm, and at 150 ma it didn't even get warm.

Some discussions around determining the charge voltage involved the kind of charging circuitry in use and how it handles the increasing voltage in the pack, especially when it is close to full. I have a GT 500.

I would appreciate feedback about what sort of charge rate to use. I know slow and steady gets it done (.1C) but would like to charge the pack faster.
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Oct 08, 2019, 08:19 AM
Sindland MC SAA
Howard Matos's Avatar
Quote:
Originally Posted by ruff1
Been working with an 18V 1500 mah pack. I did some research, and found charge rates ranging from 0.1C to 1C. I initially used 1 amp (.66C) pack was barely warm, and at 150 ma it didn't even get warm.

Some discussions around determining the charge voltage involved the kind of charging circuitry in use and how it handles the increasing voltage in the pack, especially when it is close to full. I have a GT 500.

I would appreciate feedback about what sort of charge rate to use. I know slow and steady gets it done (.1C) but would like to charge the pack faster.
Good Day,

The GT500 will peak detect charge NiMh packs. If you charge too slow it may not peak and if you charge too fast it may false peak. I would try .5C and work your way up until you see it peak detects your pack and it has ample capacity (as long as this is a known good pack).
Oct 08, 2019, 04:19 PM
A Day @ a Time - Matt. 6:25-34
ruff1's Avatar
Thread OP
Pack very old and I'm writing it off... Ordered a lithium ion with twice the mah rating.


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