battery pack

[seaducerpete]

Do you think a 500 mah life receiver pack running 2 hitec 225 servos plus a 645 mg servo for a 2 day race is enough?

 

[Kevin Krogness]

I'd feel safer with 700-1000 nah.

 

[Robert Pickard]

Same here 1000 on up i feel safe with i actually use 1600 i feel safe

 

[Andy Brown]

Plenty, if you are doing just four rounds of racing with no open water time.

LIFE's don't drop off like Nicads and we used to race all weekend on 600 mha Nicads, even in Twins.

Prove it to yourself. Go out and run 6 tanks of fuel, then discharge the LIFE as see what's left.

The best way to feel safe is to know exactly how much was left in the pack after a certain number of runs.

 

[bzubee]

Pete just ran in evansville using 500 life pack no issues at all. Just to be sure they make a nice sized 800mha pack that will work for open water and 5 rounds with no issues.

 

[Chris Wood]

pete

i got a 500 and will be using them in the 20 boat. but i will be charging it at the end of the night regardless.. no chances here

 

[Daniel's Racing]

Plenty, if you are doing just four rounds of racing with no open water time.

LIFE's don't drop off like Nicads and we used to race all weekend on 600 mha Nicads, even in Twins.

Prove it to yourself. Go out and run 6 tanks of fuel, then discharge the LIFE as see what's left.

The best way to feel safe is to know exactly how much was left in the pack after a certain number of runs.

You never want to repeatedly and needlessly run full discharge cycles on LiFe batteries even to the safe cutoff voltage especially with brand new ones. The more often you run a discharge to deplete the full capacity of the battery is depleting it's life substantially.

If it was neccasary to do that is one thing but it isn't.

They will have a much longer life if you avoid discharges that have removed all the capacity.

To tell capacity used and what you have left simply charge the pack fully go and run and charge it again and look on the charger and it will tell you how many milliamps was replaced. What it replaced is what you used.

The proper way is to always try and have a certain percent of the pack left for a safety zone. I like a 50% safety myself but that is your choice.

If it is a 1800 pack and you see in a full outing it is taking no more than 1000 mah or thereabouts then you are good.

You can not compare NiMh capacities to LiFe capicities as even though they are measurements of load / time it means nothing when comparing batteries of different chemistries.

A 1000mah LiFe will last about the same as a 2000- 2500 NiMh. This is going to be hard for most to agree on but believe me it is a fact.

I will repeat that, MAH capacities absolutely are not comparable in batteries of different chemistries. Most think you are crazy when you try to tell them this. It can't be is what they will say. Mah is the capacity and directly relates to a source being able to run the load for a measured length of time. True but LiFe and NiMh batteries rated capacities are still NOT comparable. Then you say one or the other is wrong then. Well maybe but you can't compare them 1:1 as being the same rating. THEY ARE NOT.

 

[ZZ RACING]

I did as Daniel said and checked to see how many MAH it took to top a 2s LIFE pack off. What I found is that I was using around 50 MAH per heat in my gas sport hydro. Love the LIFE batts.

 

[Andy Brown]

Good info Daniel and Chris!