I recently bought a new bike/cycle that came with a BBB Highpower 2.0 torch/lamp. The lamp is attached to a battery pack with no specifications on the outside through a 2.5mm DC connection cable.

I lost the charger on my way home. The lamp is out of production, the manufacturer told me to consult an electronics store.

How can I safely charge the battery pack? I know 2.5mm DC to USB connectors exist, but I'm guessing that's too easy? Can somebody give me some pointers? Thanks!

UPDATE: this seems to be the manual. Specifications for the battery are:

  • Lithium Ion
  • 2x18650, 2200mAh, 7.4 V charging voltage
  • 1hr charging time
  • 150 grams
  • charger 110V-240V, AC 50-60Hz
  • Output current: 700 mAh +/- 10%

enter image description here

  • 1
    \$\begingroup\$ Without knowing what's inside the battery pack, or the specifications of the charger, there is no way of telling how to charge the battery pack safely. \$\endgroup\$
    – ocrdu
    Jan 25, 2022 at 22:46
  • 1
    \$\begingroup\$ Open the battery pack and see what's inside. Which may ruin any waterproofing or seal of the case. Or find one on fleabay second hand? \$\endgroup\$
    – Passerby
    Jan 25, 2022 at 23:19
  • \$\begingroup\$ I updated the question to inlude info from the apparent manual. Does that change things? \$\endgroup\$ Jan 26, 2022 at 7:57
  • \$\begingroup\$ Not a great deal. People often use the term "charger" to describe something that is simply a power supply, with the actual charging control circuits being built into the device itself (e.g. pretty much all mobile phone chargers nowadays). \$\endgroup\$
    – Finbarr
    Jan 26, 2022 at 11:00
  • \$\begingroup\$ ...though in this case, the fact that there's a status LED on the charger would suggest that it really IS a charger and not just a supply. \$\endgroup\$
    – Finbarr
    Jan 26, 2022 at 11:10

1 Answer 1


I think you have either a BLS-65 or BLS-66.
According to the manual, here you need a 7.4V DC charger that will supply at least 1000ma of current and have the correct connector.

Prim. voltage: 100-240 V AC 50-60 Hz
Charging voltage: 7.4V DC
Output current: 1000 mAh ±10%
Battery pack: 2x 18650, 2200 mAh

  • 1
    \$\begingroup\$ Thats... incomplete. This isn't just a standard constant voltage charger. \$\endgroup\$
    – Passerby
    Jan 25, 2022 at 23:18
  • \$\begingroup\$ Hi, I took a look at the manuals you provided and I'm pretty sure it's the BLS-63 Highpower model 2011. I'll update the question/info according to this manual. \$\endgroup\$ Jan 26, 2022 at 7:50

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