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Battery for UWLD 144WH Canister

Discussion in 'Do It Yourself - DIY' started by Ouvea, Feb 23, 2021.

  1. Ouvea

    Ouvea Solo Diver

    # of Dives: 1,000 - 2,499
    Location: CA, USA
    Hello All:

    My UWLD35 kept stepping down in power levels after 1.5 hours yesterday. Pack is about 8 years old and has seen its fair share of use. It might be on its way out.

    I have the older canister design with latches, which are no longer manufactured. I would need to have the cap modified to the latchless design and buy the new battery cannister, which will cost me over $1K. Anyone have recommendations on an aftermarket battery pack solutions? The charger says its for use with 18.5V Lithium Ion battery packs. I found the following on BatterySpace, which appears to fit inside my canister (internal diameter measures 2 inches).

    Custom Li-Ion 18650 Battery: 18.5V 7800mAh (144Wh, 4.0A rate) Battery Pack with PCB in Star configuration

    Capacity matches my OEM pack but I don't know if the discharge rate is the same. This pack has a max dicharge rate of 4Amp. Is this sufficient to properly power my UWLD35? Diving next weekend so will fully charge and monitor the light again.

    rjack321 likes this.
  2. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    18.5*4=74 watts, the LD35 pulls a max of like 40w.
    If it physically fits and you're comfortable pulling it apart, then go for it

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