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wopachop's avatar
wopachop
Explorer
Apr 28, 2019

Whats normal voltage drop from a 4amp load? (210ah)

I have two brand new 6v from costco. I pulled 20amp hours out of them a week ago and then fully charged with an automotive battery tender. Today i put a 3.8a load on them and voltage is down at 12...
BFL13's avatar
BFL13
Explorer II
Apr 28, 2019
You are right, that is too much of a drop for that small load. Indicates the batts are not fully charged like you think from using that charger. You must use an hydrometer to determine the actual state of charge.

You might not have a charger that can do it right.

Pretend your 6s are Trojans (be similar for this work) and follow Trojan's instructions here

https://www.trojanbattery.com/pdf/TrojanBattery_UsersGuide.pdf

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