Search results

Date Relevance Most replies

  1. themotorman

    storing LIpo not doing OK

    I bought some Lipos, GBS type, 20 Ahr in 2010 and they were stored in California coastal climate and not used for three years. I charged them during that time when they got below 3.1 volts and thats it. Tried to use them now and those that I have tested, 6 of the 112 total, have only about...
  2. themotorman

    BMS using Max680X series

    I found these chips that are intended for monitoring power supplies, they come in different preset voltages but have a 2.5 V that looks useful. It is a three terminal device that provides a signal when the voltage goes below 2.5 volts... mmm ideal fro low bat signal I think, just connect to a...
  3. themotorman

    LIMnPO4?

    Anyone have info about using LiMnPO4 lion batteries. As far as I can tell the cost/mile for these is currently lower than LIFePO4. and their energy density is also higher. Life is lower but so is cost. It is a more mature technology too so the cell makers probably know how to optimise them...
  4. themotorman

    Dead cells OPTIMUM DO NOT BUY WARNING

    I bought 10 packs of 48 volt 20 Ahr from Optimum in China. The packs each contained 16 x 16 cells in a parallel-series arrangement, with BMS for each pack. They all failed within one year due to poor construction and poor BMS. Optimum will not offer a refund or replacement except at full price...
Back
Top