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I'm not into electronic so this is why I ask people who know.

I have an opportunity to buy a 5,000 mAh LiPo charger but I will use it to charge up to 14.8V 8,000 mAh batteries.

Will it charge the battery or should I buy a stronger charger?
Can it damage the battery?

The charger is a LiPo RC charger (ECO SIX) and the batteries are zippy 8000 mah 4 cells 14,8v thanks again


RM:mAh figures edited - originally wrongly said 5 mAh ad 8 mAh

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closed as off-topic by Leon Heller, placeholder, Matt Young, Vladimir Cravero, Chetan Bhargava Jul 13 '14 at 20:30

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  • "Questions on the use of electronic devices are off-topic as this site is intended specifically for questions on electronics design." – Leon Heller, placeholder, Matt Young, Vladimir Cravero, Chetan Bhargava
If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ Could you check those numbers? 8mah is a very small battery, surprisingly so at 14.8V! Is it 8000mAh? (ie: 8 Ah) \$\endgroup\$ – carveone Jul 13 '14 at 10:51
  • \$\begingroup\$ got the answer even if its off topic.thanx to carveone i got it. \$\endgroup\$ – user49273 Jul 14 '14 at 9:07
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Generally speaking the maximum charge current with LiPo batteries is 1C. Most of the datasheets I've read recommend 0.5C but many allow up to 1C before stating that the battery's life will be shortened.

Here's a picture I grabbed from the web showing the two stages of LiPo charging for a single cell (3.6V battery). There's a constant current phase until the battery voltage reaches exactly 4.2V. This will happen at about 80% of capacity. Then the charge voltage is held at 4.2V while the current slowly drops off. The current will never hit zero so the charger decides what a 100% charge is. If the charger isn't too smart, it'll keep charging forever - that's when your laptop says "Charging: 99%" for hours and hours!

enter image description here

So if you have a battery pack that is rated at 2200mAh you may charge at up to 2200mA (ie: 2.2 amps) for approximately 1 hour (it will take longer due to the way the charger works) but preferably at half that - 1.1 amps for roughly 2 hours. In addition, if the battery pack is (say) 14.8V, the charger must be designed to charge for that voltage. LiPo require very accurate charge voltages and severe damage will result if you not comply.

I'm sure there's a lower level current below which the battery will not charge or take an infinite amount of time to charge. It's probably very small though. There's a 500mA charger on my desk which I've used to charge some 10,000mAh batteries. That would be a rate of C/20. So it takes ages but it does work.

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