Streamlight 20237 SL-B9 Protected Li-Ion USB-C Rechargeable Battery, 2-Pack

Great rechargeable battery for Streamlight Vantage II headlamp. Operators say longevity is same as non rechargeable but it always depends on usage, how long and in what capacity. Charges quickly with USB-C charger. Operators say the difference between this and non rechargeable is that this one just stops working when it needs charged. The non rechargeable will dim before its ready to be replaced. Quality seems good like most Streamlight products. Unsure on value, it depends on how many months/years before it won't charge enough to be able to use.

They power my TLR-7X just fine. They recharge and last for a good while with good power output. They feel nice and having a type C charging port is nice.

Exactly replacement. Work as expected.

Genuine streamlight batteries at a great price for a 2 pack. Love the rechargeable ones being you can simply swap one out with another while ones plugged in. Normal ones get expensive when you run them in several lights after awhile. They last a long time on a charge which is great.

Batteries seem good. More power fully charged than bought batteries! I use them in a light/laser combo and it eats batteries for breakfast, lunch, and dinner. These work pretty good. Still gotta charge them often. Better than buying batteries, I actually couldn’t buy enough so it makes sense to have these rechargeable ones. I will try different brands just to compare.

The Streamlight SL‑B9 with its 850 mAh rechargeable battery delivers reliable, powerful light—with up to 1,000 lumens and solid Streamlight build quality. Charging is easy thanks to its micro‑USB port, and the battery life is predictable—you’ll get several hours of steady output before needing a recharge. The light feels rock‑solid, fits comfortably in hand, and the tail‑switch layout is intuitive even with gloves on. Where it loses a star is the price. Streamlight’s reputation shows, but so does the premium cost. For the same lumens and rechargeability, other brands offer similar specs at a lower price—often with USB‑C and extra batteries or accessories included. On performance alone, it’s hard to fault—just hard to justify the price tag. If you want a dependable, rugged, rechargeable light and money isn’t the main concern, the SL‑B9 hits the mark. But if you’re budget‑minded, there are capable alternatives that deliver nearly the same results.

This is the future of batteries, my friends. If you cannot recharge your 123 batteries, you are tossing alot of money out the door. I particularly like these batteries for training. I would use disposable 123 batteries for duty usage, but use these for training. The rechargeable batteries will drain in power over time, but disposables will tend to hold their charge better. overall a terrific value and from a company you can trust.

Replaced my battery in my TLR-7 Sub and TLR-7A, and noticed that it made my lights noticeably brighter. Highly recommend these lights even if you don’t own the HLX or X versions of the TLR-7.

Pésimo producto. No merece ni una estrella. Compré 4 baterías confiando en la fama de la marca y la publicidad. De las 4, una ¡simplemente no carga ! (ver foto anexa). La duración de las baterías es mínima. Uso una lámpara de mano frecuentemente, la energía de las baterías dura media hora y después se agota totalmente (!). Es increíble que otras baterías de aparente menor calidad sean superiores a streamlight; en el mismo uso duran hasta 3 días. No es un producto barato, pero es malo , pésimo. No lo compren. ¡Quiero mi dinero de vuelta!