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› What size batt for a field charger?
12-02-2007 03:46 PM  9 years agoPost 1
SJS

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NYC

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I have a hyperion 1210I and I am going to charge mostly 3c 2200's, maybe charge at 2c or charge 2 packs simultaneously. I have a booster pack that I used to use with my old triton charger. What do you think? I was thinking of a car battery, if so which one?

SJS

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12-02-2007 06:18 PM  9 years agoPost 2
Rob_T

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Car batteries are designed for brief high amp loads (starting) not deep discharge, so they wont last very long in this application. Look for a battery designed for deep cycle use - quite often marine batteries fit this description.

For the batteries you say you want to charge, you'll need about 2.5 to 3 amp-hours capacity for each full charge you want to do.

Wal-Mart is a source for marine batteries!

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12-02-2007 06:29 PM  9 years agoPost 3
chuckhager

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Clovis, CA

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Agreed. Deep cycle marine batteries are the way to go. I got the largest amp/hr battery I could find at Costco to charge my 10S packs in the field. If you live near a Costco warehouse, they have some very good prices for these batteries.

Chuck Hager

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12-02-2007 07:28 PM  9 years agoPost 4
smcbmw

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Louisville, Kentucky

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I often use a jump box power supply but it only gives me about 6 charges (3cell 2200 mah) before it starts to die. Marine batteries are by far the best and dont become damaged due to deep discharging

10-8

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12-02-2007 08:11 PM  9 years agoPost 5
fergus

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Ireland

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You can apply these figures to see what you need.

Pack voltage X charge current = watt-hours of capacity

12.6volts X 4.2amps= 52.92 watthours (charging at 2C)

X 6 charges= 317.52watt-hours

pluss 20% for efficiency:

317.52 X 1.2= 381watt-hours

I would add another 20% to avoid taking too much out of the marine battery

381 X 1.2= 457.2watt-hours

divided by 12volts equals required minimum capacity

38mp-hour capacity will give you 6 charges at 2C. Marine batteries usually range from 40amp-hours to 120amp-hours so you should be able to see what suits you best from that. The higher capacity marine batteries can be very heavy though.

Regards

Fergus

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12-02-2007 09:23 PM  9 years agoPost 6
Rob_T

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Fergus, if you charge at the 2C rate, you'll only need to charge for 1/2 hour. You doubled the capacity estimate as a result.

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12-02-2007 10:28 PM  9 years agoPost 7
QueeQueg

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West Texas

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Get the biggest battery you can carry

like lipos the less you stress them the longer they'll last.

Also recharge them asap after using them and the quicker you charge them the less life you'll get.

A 120 AH deep cycle will last nearly twice as long if charged at 4As compared to one that is recharged at 10As +. Any charge that gets the electrolite boiling is going to be detrimental in the long run. Car batteries are made to discharges large current bursts and recharge quickly at high rates. Deep cycles are the opposite.

You can get AGM batteries like the Optimas that are much more abuse tolerant than the flooded cells but they cost 3 times as much and their capacities are less pound for pound. you won't get 3 time the life maybe twice.

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12-03-2007 01:40 AM  9 years agoPost 8
fergus

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Ireland

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D Oh well spotted Rob I missed that

Regards

Fergus

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12-03-2007 03:39 AM  9 years agoPost 9
SJS

rrApprentice

NYC

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Thanks Guys. I'll check around this week for a marine batt.

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