Page 43: of Marine Technology Magazine (November 2022)

Photos by Kevin Hardy

Figure 9

The Internal Resistance (left) and Max Current (right) can be measured and recorded for a new battery. These photos show a measurement of the condition of the full battery with BMS. If the estimated load is under 40A, this battery is ? ne.

It is not necessary to hook-up to the balance plugs of the LiPo battery to make a general assessment, though it presumes the BMS is doing its job of balancing each cell. Should the net IR value increase from the initial measurement over time, the battery may need to be replaced. meter as a check against the ESR, but would trust the ESR as sity and search for “BU-704a: a better instrument for this important task. ($19, at Tenergy Shipping Lithium-based Batteries by Air”.

Power ) If you ? nd IATA shipping is too restrictive, don’t worry: you designed unmodi? ed batteries into your battery pack! Pull the

UNOLS ON SHIPBOARD LIPO SAFETY batteries out, and ship the housings empty. Order a new set

Four University-National Oceanographic Laboratory Sys- of LiPos to be delivered to your agent in the foreign port of tem (UNOLS), WHOI and USN documents maybe found at operation. Open and reassemble the battery pack there.

.

CONCLUSION

Scripps Institution of Oceanography has a similar document I haven’t tried charging LiPos under pressure, as one might at

BatteryGuidelines.Nov-2014.pdf> I hope this was helpful and you’ll explore the cool things

LiPos can do for you.

SHIPPING:

IATA UN 38.3 restrictions apply. Good tip: Do not modify

OTHER RESOURCES, BOOKS the LiPo batteries in anyway, and the UN 38.3 test certi? ca- “Batteries in a Portable World”, Isidor Buchmann, 2016, tion document the manufacturer used to ship them to you still (ISBN 978-0-9682118-4-7) applies. They are required to give you a copy if you ask. Fe- “DIY Lithium Batteries”, Micah Toll, 2017, (ISBN 978-0- dEx and UPS publish their guidelines based on IATA Rules. If 9899067-0-8) you ship the LiPos inside of a housing, they are quali? ed to be transported under UN3481, which is less restrictive. This is FUTURE because the housing protects the battery from incidental punc- IEEE Spectrum (October 2022) reported on Mercedes-Benz ture. For more information in IATA rules, see Battery Univer- prototype Vision EQXX sedan. It will sport a “high silicone www.marinetechnologynews.com 43

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