Alfalfameister
Posts: 52
Joined: 12/25/2005
From: MuntinlupaMetro Manila, PHILIPPINES
Status: offline
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Since I can't test with an onboard data recorder, etc... I'll have to use the discharging feature of my MuchMore CellMaster.
This is what I plan to do:
PHASE 1: The Slow Charge Method
1. Slow Charge the battery pack (6 cell side-by-side GP3300) at C/10 (in my case, C/13... close enough -- 250 mah wall wart) for 16-20 hours;
2. Discharge to 6.6v (or 1.1v per batt average) at 10 amps using the MuchMore CellMaster.
3. Take readings (Discharged mah, time, internal resistance, temperature -- all as measured by the MuchMore CellMaster)
4. Let Battery rest several hours, then charge it again using the wall wart for about 10 hours (not 14-20 hours anymore, as the battery was not drained anyway).
Reason for using a wall wart is because that's what people would use when slow charging anyway (yes, they could use a higher end peak-detecting one, but for C/13 charging, the wall wart can't hurt, can it?).
Battery will NOT be discharged further after it has reached the 6.6v cut off (I'm not using the 5.4 because, I _think_ that at 6.6, the battery won't really be that competitive anymore for racing, and most racers would park their car when it slows down like that). The remaining charge will stay there until the next charging which will be several hours after.
I will do this for about 5 times. (i.e., over 5 days)
PHASE 2: Fast Charge
1. Discharge battery using a Spintec Battery Manager (supposedly brings it down to 5.4)
2. Tray with Tekin Battery Doctor until lights are out. Keep it trayed until actual charging time.
3. Charge using MuchMore Cell Master using step charging method: 2000mah @ 7 amps, then another 500 @ 3.5 amps, then the rest (until it peaks) @ 7 amps again.
4. Discharge at 10 amps (as above -- cutoff 6.6v) and take readings. So, the discharging method will be EXACTLY as in Phase 1.
5. Discharge battery using Spintec Battery Manager, then tray it again after.
6. This means, because it is being fast charged, I can do one cycle in the morning, then in the afternoon, take it out of the tray and charge and discharge again, then "spintec and tray" it again until the next day.
I will do this about 5 times as well. (Since it is fast-charged, I could do two a day -- one early in the morning, and one before bed, and in both cases, there would have been enough time for the battery to rest)
WHAT'S THE USE IN ALL OF THIS? Well... nothing... I guess because I'm just a geek.
P.S. A used battery (but still quite good!) will be used for this experiment. No new batteries will be harmed during the filming of this movie. 
Known problem: Phase 2 might show better numbers because the battery was already conditioned/cycled by Phase 1. A solution to this is to have another battery where you do Phase 2 before Phase 1. But I neither have the time nor the inclination (nor the battery) to do so (hey, I'm a geek, but not _that_ much of a geek!).
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> RE: Quick newb question: How to discharge packs? 
RE: Quick newb question: How to discharge packs? - 
EDIT-> on the other hand if the fast charging method proves out ??? 
