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Charging NiMh Battery Packs for GP300

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iMONITOR

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I have a set of two GP300's that originally came with Motorola HNN9620B Ni-Cd 1200mAh battery packs, and HTN9702A desk-top chargers with 12VDC, 200ma power packs.

I've recently replaced the Ni-Cd batteries with Ni-Mh 1800ma batteries. Can I still charge the new Ni-Mh batteries in the desk-top chargers?

From what I've read the biggest problem with charging Ni-Mh batteries is under charging (usually cause by timers, or other auto charging devices), or over charging. I also read that Ni-Mh batteries can be charged at a rate of 10% of their mAh capacity, which would be 180ma. The NTN9702A from what I can tell is a dumb charger. So I think at 200ma I should be ok as long as I don't charge them too long. It's referred to as a 10 hour charger, buy my math says it might charge the Ni-Mh batteries in about 6.75 hours.

I arrived at this conclusion based on the following. Motorola makes a fast charger (90 minute), HTN9042A, for both Ni-Cd, and Ni-Mh batteries. It charges at a rate of 900ma. So the difference between the two chargers is 700ma, or a factor of 4.5. So if I multiply 90 minutes by 4.5 I get 405 minutes, or 6.75 hours.

Does this make sense, or am I missing something?

Thanks,
Bill
 
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SCPD

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I'll say yes ...

I've never used the NiMH batteries for the GP300, but I have for the HT750. We use the same charger for both batteries, and the charge seems to last about the same, regardless of which battery is on the radio.
 

iMONITOR

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I've never used the NiMH batteries for the GP300, but I have for the HT750. We use the same charger for both batteries, and the charge seems to last about the same, regardless of which battery is on the radio.
Are you using a standard slow (about 10 hrs) charger, or the quick charger (about 90 min)? How long are you actually charging on the average?

Thanks
 

RodStrong

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Are you using a standard slow (about 10 hrs) charger, or the quick charger (about 90 min)? How long are you actually charging on the average?

Thanks
I didn't know a standard charger existed for the HT750 series. Do they look the same as the rapid chargers? Just curious.
 

SCPD

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Location
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HT750 charging

I didn't know a standard charger existed for the HT750 series. Do they look the same as the rapid chargers? Just curious.
We only got one kind of charger for the HT750's. We don't have any of the Impress stuff. On average, the green light starts blinking in about an hour, and goes steady in about another half hour to an hour.
 
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