Can someone tell me which Chinese company makes a 510 auto battery with a very small hole? I heard there is one with a vacuum switch and it has a long cut-off time.
bump. i'd like to know this as well. i've been using 510 adapters on bloog 808 autos. very happy but i'm wondering if there is a 'native' 510 slim with the same good performance. i have some mini 510 auto batteries from a tank kit but they don't cut it. any recommendations? maybe sd keychain?
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