Tag: cutoff voltage

Kokam Lithium Polymer 5S 4000mAh 30C battery (WHL #30)

Yawn. Another battery pack. But also new hardware for the electronic load, so testing conditions have improved :)

Today’s item is a Kokam SLPB 400030-0501K(9543140H5) battery pack. Kokam is one of the big players in lithium polymer batteries, and given the battery was purchased at the same time as the last item, I guess this one wasn’t a cheapie as well. No Wan Hung Lo this time, but after all, it’s not an item that I bought… ;)

It is clearly aimed at RC stuff, having 4000mAh at 30C discharge rate, 18.5V nominal / 21.0V max voltage, 8000mA charging current. […]

15th October 2017 15th October 2017 By Bzzz In No Comment

modellbaufuchs 26650 6S2P 4.6Ah LiFePO4 battery pack with balancer port (WHL #29)

And another one. I’ll churn these battery reviews out once per week now, even though I said I would rather go biweekly. It’s not much extra effort – charging, discharging and then plotting the data has to be done anyway, taking some extra photos and waffling on about it on my blog is a plus.

So this week’s item is a 6S2P battery pack, LiFePO4, rated at 4.6Ah. It’s from modellbaufuchs, which I just visited in preparation for this post. Not sure if they are still in business, as their latest news item on the page dates back to early 2015. […]

8th October 2017 3rd October 2017 By Bzzz In No Comment

26650 LiFePO4 8S battery pack with BMS (WHL #27)

This weeks article is another by-product of the ADC testing (WHL #26) from last week. Could’ve packed in there, but I wanted to share some remarks on Chinese battery technology…

So first of all, this isn’t a piece of kit that I bought myself. After testing two 12V/2.2Ah lead batteries from work that were sitting unused on a shelf for five years, I needed another victim. Those quality Panasonic cells were flat as Kansas – the LC-R122R2PG datasheets recommends 8.6V cutoff voltage at 3C = 6.6A or 9.7V at 1C. Fully charged, they delivered 1C at 7V or 1.5C at 2.5V at full charge – slow 10.5V discharging to 0.1C cutoff and recharging didn’t help much. […]

10th September 2017 10th September 2017 By Bzzz In No Comment

A beefy electronic load (#P4F2)

Hello again!

I’ve been asked: What do you do with this electronic load thing? Well, I‘ve been using it as a battery torture device, what else could you do with a variable resistance device…

For a crude first step in actually testing my unit and also classifying a newly harvested set of deeply discharged 18650 cells, I slapped together some minimalistic Arduino program and hooked the thing up in parallel to the battery under test. The electronic load was set to 2 Amps with another battery, which was monitored by the Uni-T 203A current clamp. […]

27th August 2017 3rd September 2017 By Bzzz In No Comment