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Old 01-19-2005, 02:32 AM   #1
MDL
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Default Charging a Ni-Mh on a Hi-CD, to get higher voltage?

Hey guys,

I have a Supernova 250s the max amps you can charge a Ni-Mh is at 3 volts. I am able to select a Ni-CD and change it at 5 volts,

Will this kill the battery? I only ask is that I have 2 Sanyo 3000 RC-3000H packs and I can't get them to take a full charge. I mean I discharge them and they will only charge up to 2500-2800.

I have a cheap 3000 Ni-Mh pack and do the same thing and it takes a 3300 charge?

So will it kill my batteries?

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Old 01-19-2005, 03:47 AM   #2
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Does the charger have an adjustable peak delta? If so, you can set it to a NiMH safe level and used the NiCd charge at 5A.

I think your problem is more likely the cells - a higher charge rate won't help you get more charge in.

They are either false-peaking (i.e. still cool when the charge finishes) and need to be topped up with another charge, or they are just old and out of condition. The 3000H was Sanyo's first 3000 cell, is well short of the perfromance we get now, and didn't have a very long usable life either before capacity and voltage plummeted.
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Old 01-19-2005, 04:48 AM   #3
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On your super nova are you using the Auto charge mode or are you selecting the (manual) start mode.
In (manual) start charge mode you can increase the amps to 5 by holding down the up button.
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Old 01-19-2005, 05:58 AM   #4
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I'm using the manual start mode. Yes you can increase the voltage but not when you have Ni-MH and 3000 selected it drop's back to 3 amp max :-(


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Old 01-19-2005, 09:04 AM   #5
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I have some exp with this charger. It has a brain that interprets feedback from the battery during charging. It will drop the charge rate under certain conditions mainly due to battery condition. I used to set it up manualy as a 5000mAh pack so I could charge at 5amps.

Also...
Only new 3000's ever charged to the 3000 capacity. Once they were used a few times they loose heaps of capacity and some voltage. Just cheak that the batt is warm when it finishes charging. If not, you will need to restart it.

Note: on auto mode, no other charger can match this one for batt performance... tho it is its own enemy cause you don't know when your pack will be charged either!!!!
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Old 01-19-2005, 02:08 PM   #6
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yeah but you can only select 5amps on the Nicd. By the sound of it, it shouldn't hurt the batteries.


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Old 01-26-2005, 04:26 AM   #7
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you can definitely select 5amps on NIMH in start mode.
Nicd peak differently to Nimh so I woudln't use it that way.
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