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Old 01-11-2002, 05:45 AM   #1
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Default Virtually meaningless 3000 observation

Thought I might share with you the discharge characteristics of my Sanyo 3000's (original type), after being left for two weeks with a full charge in them.

This is using a Pro-trak charger.

First of all, when I first started discharging (at 20A), the pack voltage was about 6.2

It dipped to about 6.1, then actually rose again, certainly higher than 6.2.

I stopped watching it for a bit then.

When the discharge finished, it was a capacity of about 1800, whereas my 3000's usually have a capacity of 2500 (i know that's poor - don't know if it's dodgy integy packs, or using a cheap charger for the first 6 months of the packs' lives).

Anyway, the moral of the story is, don't expect to get good performance from your packs if their charged before raceday.

At least re-peak them before the races.
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Old 01-11-2002, 07:08 AM   #2
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Yeah, packs will slowly loose voltage, and I imagine if that pack had been left for 2 weeks, it had lost a lot.
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Old 01-11-2002, 07:18 AM   #3
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A downside of NiMh, is they faster self-discharge, than NiCd. I think I've read on a Duracell document on the web, that the rate of NiCd is about 1% capacity pr. day for NiCd, while NiMh is about 5% per day.

If I remember correct, you're not letting your cells rest between race/practice and next charge. Well, I'm not an NiMh expert and I use NiCd as well. But I find that the less rest between discharge/race and next charge, the less capacity. In addition, the higher charge rate, the lower capacity (don't know your charge rate). SMC-Racing in addition recommend 2,5 hours resting for NiMh. So maybe this explain the relative poor capasity.
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Old 01-11-2002, 10:04 AM   #4
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I start changing the pack in going to race with in the next hear 45 minutes before the heat starts. And I leave it on the peak charger til 3 minutes before the race starts. NEVER the day before.
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