battery charging time???
 

i have a 4100mah c size battery for my glow plug igniter and a 2100mah c size battery. the charger im using is output 1.25v 170ma. how long should i charge the 4100mah battery? and how long for the 2100mah battery? the red light on the charger dont change colors or go out when its completed. thanks!

4100 mah would be 24 hours from dead at 170mah
2100 mah would be 12 hours from dead at 170mah

Battery mah divided by the charge mah = X hours

ok thanks! wow! 24 hours. i always charged it for like 2-4 hours,lol. well the 4100 was pretty dead and i plugged it in at 2:30p.m. today. so i will let it charge until 2:30 tomorrow. now lets say its fully charged and i use it for a few times like total 5-10 minutes. how long should i charge it for if i only use it a little bit?

You would have to determine the time based on the amp draw over said 2-4 hours.
In theory lets say for simplicity reasons your ignitor pulled 170 mah an hour for 4 hours. You would have to replace that with 170 mah X 4, so 4 hours at 170mah back into the pack.

Now these are just numbers and I have not figured in voltage drop that ninms and nicads lose just sitting and over time with storage loss. I don't have the figures for that. LOL

To be honest I have a charger that for $45 bucks that will charge everything, lipo, liFe, Nicad, nihms, everything basically, and it came with all the plugs to charge those batteries including the ignitor plug. All you do is set the current and charge, it figures out when the battery is fully charged.

Check it out here. http://www.hobbypartz.com/thac6smbachw.html

Its the best investment I have made for my batteries to assure I dont have a failure.

yea thats sounds like a nice charger! i have a hot bodies micro charger i use it has 1,2 and 4 amp charge rates. it also beeps when the battery is done charging. but it cant charge these glow plug igniters unfortuneally:( i think after i charge these 2 batteries for 24 and 12 hours, i usually charge them for like a hour after a few day or a week of just sitting just to keep them charged up. when i use the igniter, most the time im only using it a few times or no more than 10 minutes at a time of running.